Virgin aggregate is being used faster than it is being made available creating a foreseeable shortage in the future. Despite this trend, the availability of demolished concrete for use as recycled concrete aggregate (RCA) is increasing. Using this waste concrete as RCA conserves virgin aggregate, reduces the impact on landfills, decreases energy consumption and can provide cost savings. However, there are still many unanswered questions on the beneficial use of RCA in concrete pavements. This research addresses the many technical and cost-effective concerns regarding the use of RCA in concrete pavements by identifying concrete mixture and proportioning designs suitable for jointed plain concrete pavements; constructing test sections using varying amounts of RCA; monitoring performance through testing, condition surveys and sensor data; modeling RCA pavement performance; and predicting life cycle costs. The research was carried out as a partnership between the Centre for Pavement and Transportation Technology (CPATT) at the University of Waterloo, the Cement Association of Canada, Dufferin Construction, and the Natural Sciences and Engineering Research Council of Canada. The literature review provides an overview of sustainability and key performance indicators, the material properties of RCA both as an aggregate and in concrete, concrete mixture and proportioning designs with RCA, performance of existing RCA pavements, and the implementation of RCA highlighting some examples where RCA has been used successfully. Twelve preliminary mixes were developed using three total cementitious contents amounts of 315 kg/m3, 330 kg/m3, and 345 kg/m3 to determine four suitable mixes with varying coarse RCA contents (0%, 15%, 30% and 50%) to place at the CPATT test track. At 28-days, all of the twelve mixes exceed the 30 MPa design strength. Four test sections containing 0%, 15%, 30% and 50% coarse RCA were constructed in June 2007. The test sections had identical cross sections consisting of 250 mm portland cement concrete (PCC), 100 mm asphalt-stabilized OGDL and a 450 mm granular base. For each coarse RCA content, one slab was instrumented with six vibrating wire concrete embedment strain gages to measure long-term longitudinal and transverse strain due to environmental changes, two vibrating wire vertical extensometers to monitor slab curling and warping, two vibrating wire inter-panel extensometers to monitor joint movement, and two maturity meters to measure maturity and temperature. Quality assurance and quality control (QA/QC) testing showed that the mixes containing RCA exhibited similar or improved performance when compared to the conventional concrete for compressive and flexural strength, freeze-thaw durability and coefficient of thermal expansion. Pavement performance of the four test sections was evaluated using visual surveys following the Ontario Ministry of Transportation’s Manual for Condition rating of Rigid Pavements. Nine pavement evaluations have been performed every two to four months since construction. All test sections are in excellent condition with pavement condition index (PCI) values greater than 85 after two years in-service and approximately three hundred thousand Equivalent Single Axle Loads. Sensor data from the strain gauges, and vertical and inter-panel extensometers are providing consistent results between the test sections. Long-term performance modeling using the Mechanistic-Empirical Pavement Design Guide (ME-PDG) showed improved performance with respect to cracked slabs, joint faulting, and pavement roughness as the RCA content increased. Multivariable sensitivity analysis showed that the performance results were sensitive to CTE, unit weight, joint spacing, edge support, surface absorption, and dowel bar diameter. Life cycle cost analysis (LCCA) illustrated the savings that can be expected using RCA as a replacement aggregate source as the cost of virgin aggregate increase as the sources becomes depleted. Multivariable sensitivity analysis showed that the LCCA results were sensitive to construction costs, discount rate, and maintenance and rehabilitation quantities.

Virgin aggregate is being used faster than it is being made available creating a foreseeable shortage in the future. Despite this trend, the availability of demolished concrete for use as recycled concrete aggregate (RCA) is increasing. Using this waste concrete as RCA conserves virgin aggregate, reduces the impact on landfills, decreases energy consumption and can provide cost savings. However, there are still many unanswered questions on the beneficial use of RCA in concrete pavements. This research addresses the many technical and cost-effective concerns regarding the use of RCA in concrete pavements by identifying concrete mixture and proportioning designs suitable for jointed plain concrete pavements; constructing test sections using varying amounts of RCA; monitoring performance through testing, condition surveys and sensor data; modeling RCA pavement performance; and predicting life cycle costs. The research was carried out as a partnership between the Centre for Pavement and Transportation Technology (CPATT) at the University of Waterloo, the Cement Association of Canada, Dufferin Construction, and the Natural Sciences and Engineering Research Council of Canada. The literature review provides an overview of sustainability and key performance indicators, the material properties of RCA both as an aggregate and in concrete, concrete mixture and proportioning designs with RCA, performance of existing RCA pavements, and the implementation of RCA highlighting some examples where RCA has been used successfully. Twelve preliminary mixes were developed using three total cementitious contents amounts of 315 kg/m3, 330 kg/m3, and 345 kg/m3 to determine four suitable mixes with varying coarse RCA contents (0%, 15%, 30% and 50%) to place at the CPATT test track. At 28-days, all of the twelve mixes exceed the 30 MPa design strength. Four test sections containing 0%, 15%, 30% and 50% coarse RCA were constructed in June 2007. The test sections had identical cross sections consisting of 250 mm portland cement concrete (PCC), 100 mm asphalt-stabilized OGDL and a 450 mm granular base. For each coarse RCA content, one slab was instrumented with six vibrating wire concrete embedment strain gages to measure long-term longitudinal and transverse strain due to environmental changes, two vibrating wire vertical extensometers to monitor slab curling and warping, two vibrating wire inter-panel extensometers to monitor joint movement, and two maturity meters to measure maturity and temperature. Quality assurance and quality control (QA/QC) testing showed that the mixes containing RCA exhibited similar or improved performance when compared to the conventional concrete for compressive and flexural strength, freeze-thaw durability and coefficient of thermal expansion. Pavement performance of the four test sections was evaluated using visual surveys following the Ontario Ministry of Transportation’s Manual for Condition rating of Rigid Pavements. Nine pavement evaluations have been performed every two to four months since construction. All test sections are in excellent condition with pavement condition index (PCI) values greater than 85 after two years in-service and approximately three hundred thousand Equivalent Single Axle Loads. Sensor data from the strain gauges, and vertical and inter-panel extensometers are providing consistent results between the test sections. Long-term performance modeling using the Mechanistic-Empirical Pavement Design Guide (ME-PDG) showed improved performance with respect to cracked slabs, joint faulting, and pavement roughness as the RCA content increased. Multivariable sensitivity analysis showed that the performance results were sensitive to CTE, unit weight, joint spacing, edge support, surface absorption, and dowel bar diameter. Life cycle cost analysis (LCCA) illustrated the savings that can be expected using RCA as a replacement aggregate source as the cost of virgin aggregate increase as the sources becomes depleted. Multivariable sensitivity analysis showed that the LCCA results were sensitive to construction costs, discount rate, and maintenance and rehabilitation quantities.

Using recycled concrete aggregate (RCA) as a replacement for natural aggregate in new concrete is a promising way to increase the overall sustainability of new concrete. This has been hindered, however, by a general perception that RCA is a sub-standard material due to the lack of technical guidance, specifically related to long-term durability, on incorporating RCA into new concrete. The goal of this research project was to determine whether current testing methods could be used to assess the potential alkali-silica reactivity of concrete incorporating RCA. The test methods investigated were ASTM C1260 and ASTM C1567 for assessing natural aggregate susceptibility to alkali-silica reactivity (ASR), and the ability of supplementary cementitious materials (SCMs) to mitigate ASR, respectively. Seven different RCA sources were investigated. It was determined that ASTM C1260 was effective in detecting reactivity but expansion varied based on RCA processing. Depending on the aggregate type and the extent of processing, up to a 100% increase in expansion was observed. Replicate testing was performed at four university laboratories to evaluate repeatability and consistency of results. The authors recommend modification to the mixing and aggregate preparation procedures, when testing the reactivity of RCA using ASTM C 1260. This study also investigated the efficacy of replacing portland cement with supplementary cementitious materials (SCMs), known to mitigate alkali-silica reaction (ASR) in concrete with virgin aggregates, to control ASR in concrete incorporating reactive RCA. The SCMs investigated as part of this study included: fly ash (class F), silica fume, and metakaolin. The results of modified alkali-silica reactivity tests, ASTM C1260 and ASTM C1567 (AMBT), are presented for two different recycled concrete aggregates when using 100% portland cement, binary blends of portland cement and fly ash, and ternary blends of portland cement, fly ash and metakaolin or silica fume. The results indicate that SCMs can effectively mitigate ASR in concrete made with RCA. A 40% replacement of portland cement with class F fly ash was able to reduce expansions to below 0.10% in the AMBT for concrete containing 100% of a highly reactive recycled concrete aggregate. A ternary blend, however, of portland cement with a class F fly ash and metakaolin was most effective for both RCAs tested in this study. Higher levels of mitigation may be required for some RCAs, compared to the level required to mitigate ASR in concrete made with their original natural aggregates, depending on the age and composition of the RCA. / Graduation date: 2012

Os resíduos de construção e demolição (RCD) representam cerca da metade dos resíduos sólidos urbanos. No Brasil, sua geração anual corresponde a aproximadamente 68 milhões de toneladas. Uma forma de se mitigar os impactos ambientais oriundos da disposição desses resíduos sobre o meio ambiente é o seu beneficiamento na forma de agregados reciclados. Os agregados reciclados podem ser classificados em dois grupos, agregados reciclados mistos e agregados reciclados de concreto (ARC). Entre as diversas formas de aplicação dos agregados reciclados, destaca-se a construção rodoviária por utilizar quantidade expressiva tanto de materiais graúdos, quanto de miúdos. No Brasil, ainda existem poucos relatos científicos sobre o desempenho de agregados reciclados de concreto em camadas de pavimentos. Assim, o objetivo desta pesquisa é estudar as propriedades físicas e o comportamento mecânico, através da análise de resultados de ensaios laboratoriais, do agregado reciclado de concreto proveniente da Usina de Reciclagem de Resíduos da Construção Civil de São Carlos-SP, visando seu emprego em camadas de base e sub-base de pavimentos. Foram realizados ensaios de caracterização física, lixiviação, solubilização, compactação, Índice de Suporte Califórnia (CBR), compressão simples, compressão diametral e triaxial cíclico. A título de comparação, foram pesquisados, também, um agregado natural, um solo de comportamento laterítico e uma mistura deste solo com o agregado reciclado de concreto. Observou-se que o ARC apresentou um comportamento mecânico muito próximo ao do agregado natural, material convencionalmente utilizado em camadas de pavimento na região. Destaca-se ainda que o agregado reciclado de concreto apresentou um ganho considerável de resistência e rigidez com o decorrer do tempo de cura. No tocante à energia de compactação, este parâmetro teve influência significativa sobre o comportamento do ARC para os tempos iniciais de cura, sendo que para os maiores períodos de cura, essa influência diminuiu. Finalmente, com base na avaliação dos resultados obtidos nesta pesquisa, concluiu-se que o agregado reciclado de concreto pode ser empregado na construção de camadas de sub-base e base de pavimentos. / The construction and demolition wastes (C&D) represent about half of municipal solid wastes. There are estimative that, In Brazil, are produced approximately 68 million tons annually. One way to reduce the environmental impacts caused by theirs disposal is processing to obtain recycled aggregates. The recycled aggregate can be classified into two groups according their composition: mixed recycled aggregates and recycled concrete aggregates (RCA). Among different forms of application, roadway construction deserves prominence because of its singular characteristic to use considerable amounts or materials. In Brazil, there are few researches about behavior of recycled concrete aggregate in pavement layers. Thus, the objective of this research is to study the physical and mechanical behavior of recycled concrete aggregate (RCA) from São Carlos - SP, in order to investigate its utilization in base and subbase pavements layers. The laboratorial tests included in this research were physical characterization, leaching, dissolution, moisture-density relationships, California Bearing Ration (CBR), unconfined compressive strength, diametral compression and cyclic loading triaxial tests. Even, tests were conducted to compare the behavior of a natural aggregate, a lateritic soil and a mixture of this soil with the recycled concrete aggregate. It was observed that the RCA had similar mechanical behavior when compared to natural aggregate, material usually used in pavements layers of highways around São Carlos. Besides, the recycled concrete aggregate showed a considerable gain in strength and stiffness over time. About the energy compaction, this parameter had significant influence on RCA behavior for initial curing and decreased for the more periods of curing. Finally, based on evaluation of research results it was concluded that the RCA can be used in construction of base and subbase of pavements layers.

Det pågår just nu ett arbete inom byggindustrin att allt mer gå över till en cirkulär ekonomi för att hushålla på världens naturliga resurser. För betongtillverkningen innebär det att försöka ersätta naturballast med återvunnen betong som ballast. Men för tillfället finns det lagkrav som förhindrar att naturballast helt ska kunna ersättas av återvunnen betong som ballast. Det är för att det finns vissa fysikaliska egenskaper, så som att porositeten ökar, som gör att de mekaniska egenskaperna blir sämre när naturballast ersätts med återvunnen betong som ballast. Detta examensarbete utfördes genom experimentella studier. Undersökningen utfördes i mekanik- och betonglaboratorium på Högskolan i Borås. Det utfördes en storskalig gjutningsserie där betongavfall från Ulricehamns Betong AB (UBAB) och Hedareds Sand & Betong AB (HEDA) prövades som ballastersättare till 50 och 100 %. För samtliga försök uppmättes både sättmått och betongens mekaniska egenskaper. Resultaten från betong med återvunnen betong som ballast (RAC) jämfördes med referensbetongen. Referensbetongen är baserad på ett känt- och beprövat originalrecept från UBAB respektive HEDA. Betongen med återvunnen betong som ballast är baserad på modifieringar som gjorts på referensrecept. Målet med studien var att undersöka hur återvunnen betong som ballast i betongblandningen påverkar betongens mekaniska egenskaper så som tryckhållfasthet, spräckhållfasthet och elasticitetsmodul. De testerna utfördes på gjutna cylindrar efter 28 dygn, tryckhållfastheten var också testad efter 7 dygn. Böjdraghållfasthet testades på balkar efter 28 dagar. Sedan utvärderades dessa resultat för att se hur de mekaniska egenskaperna förändras när en större del återvunnen betong som ballast används i recepten. Resultaten varierar litegrann för de olika provningarna. Denna studie styrker tesen att minskningen av tryckhållfastheten, efter 28 dagars härdning, som sker när återvunnen betong som ballast (RCA) används är inom intervallet 5–24 %. Provningarna av elasticitetsmodulen uppvisar liknande tendenser som tidigare forskning då betongen blir lite mindre styv när naturballast (NA) ersätts av RCA. Den styrker även tidigare forskning där böjdraghållfastheten är större vid ökade RCA-mängder. Då det för HEDA-recepten uppvisades en ökning med 9 procentenheter när all NA ersattes med RCA. Spräckhållfastheten uppvisade samma tendenser som böjdraghållfastheten. Det resultatet är däremot inte i linje med vad som har visats i tidigare forskning, då spräckhållfastheten har i de studierna minskat vid högre ersättningsandelar. / Work in the construction industry is currently underway to move to a circular economy to preserve the world’s natural resources. For concrete production this means trying to replace natural aggregate with recycled concrete aggregate. But for the time being there are standard allows that prevent natural aggregate from being completely replaced by recycled concrete aggregate. This is because there are certain physical properties, such as an increase in porosity, which have a negative impact on the mechanical properties when natural aggregate is replaced with recycled concrete aggregate. This thesis is carried out through experimental studies. The study was carried out in the mechanical and concrete laboratory at the University of Borås. Large scale castings were done where concrete waste from Ulricehamns Betong AB (UBAB) and Hedareds Sand & Betong AB (HEDA) were tested as aggregate replacers. For all experiments, both the measurement dimensions and the mechanical properties of the concrete was measured. The results from the recycled aggregate concrete were compared with the reference concrete. The reference concrete is based on an industrially active recipe from UBAB and HEDA. The Recycled Aggregate Concrete (RAC) is based on modifications made on reference recipes. The aim of this study was to investigate how recycled concrete aggregate in the concrete mix affects the mechanical properties of the concrete, such as compressive strength, splitting tensile strength and the modulus of elasticity. They were performed on cylinders at 28 days, the compressive strength was also performed at 7 days. The flexural strength was also tested. Those tests were performed on beams. Then these results were evaluated to see how the mechanical properties change when a greater replacement ratio is used in the recipes. The results vary slightly for the different tests. This study confirms that the decrease in compressive strength, after 28 days hardening, that occurs when Recycled Concrete Aggregate (RCA) is used is within the range 5–24%. The tests of the modulus of elasticity show similar tendencies as previous research because the concrete becomes a little less stiff when Natural Aggregate (NA) is replaced by RCA. It also corroborates previous research where the flexural strength is greater with increased RCA amounts. When the HEDA prescriptions showed an increase of 9 percentage when all NA was replaced with RCA. The splitting tensile strength exhibited the same tendencies as the flexural strength. On the other hand, this result is not in line with what has been shown in previous research, as the splitting tensile strength in those studies has decreased at higher replacement ratios.

A exploração dos recursos naturais e a degradação do meio ambiente têm sido fonte de preocupação no âmbito mundial. A busca por soluções alternativas que não causem ou que diminuam os impactos ambientais tornou-se comum na sociedade. Nesse contexto, a pavimentação vem contribuindo significativamente com soluções alternativas para destinação final de diversos tipos de resíduos, principalmente os oriundos da indústria da construção civil que sempre foi uma das maiores geradoras. Os resíduos da construção e demolição (RCD) podem ser transformados em agregados reciclados de ótima qualidade e podem ser aplicados em diversos serviços de engenharia. Os agregados reciclados, segundo a NBR 15116 (ABNT, 2004), são separados em misto e de concreto (ARC). No Brasil existem poucas pesquisas com o ARC, no entanto, as que existem e as pesquisas internacionais relatam que uma característica marcante do ARC é a cimentação própria. Portanto, o objetivo desta pesquisa é estudar o comportamento mecânico, ao longo do tempo de cura, do agregado reciclado de concreto proveniente da Usina de Reciclagem de São Carlos e de sua mistura com um solo laterítico, a fim de utilizá-los na construção de pavimentos. O estudo envolveu a análise dos resultados de resistência à compressão simples, módulo tangente, módulo de resiliência, deformação permanente e índice de suporte Califórnia (CBR) de corpos-de-prova de ARC e da sua mistura com solo laterítico, moldados em diferentes energias de compactação e ensaiados com tempos de cura variados. Ao final, concluiu-se que o agregado reciclado de concreto (ARC) é uma alternativa para construção de bases de pavimentos, podendo também substituir o agregado natural da mistura solo arenoso laterítico - brita descontínua, muito utilizada nas rodovias do interior de São Paulo. / Natural resources exploitation and the environmental degradation are a worldly problem nowadays. Searching for alternative solutions is something usual in most countries. Pavement systems are now contributing significantly with these alternative solutions by using the waste of construction demolition. This specific kind of waste can turn into mixed recycled aggregate or recycled concrete aggregate. There are just few researches in Brazil about the use of recycled concrete aggregate (RCA), however international researches have shown that this aggregate has a very characteristic and positive mark: self cementation. This research has got the objective of studying the mechanic behavior of the recycled concrete aggregate and its mix with lateritic soil on the construction of base pavements with different analytic basis. The study involved the analysis of the laboratorial tests results of the unconfined compressive strength, tangent modulus, resilient modulus, permanent deformation and California Bearing Ration (CBR) of RCA specimens and its mix with lateritic soil, molded in different compaction energy and tested in different curing times. In conclusion, this kind of recycled aggregate has proved to be a sustainable alternative for the natural aggregate in the construction of many roads in small cities of the State of São Paulo - Brazil.

O presente trabalho avaliou a viabilidade do uso de Resíduos de Construção e Demolição (RCD) provenientes da geração de dois traços de concretos distintos. Um Concreto Convencional-CC (traço em massa:1:2,94:3,56; a/c:0,61) utilizando cimento CP IV 32 e outro concreto de Alta Resistência-CAR (traço em massa:1:1,11:2; a/c: 0,22; com adição, aditivo e pó xadrez vermelho) utilizando cimento CP V-ARI. Após 28 dias de cura, 3 corpos de prova de cada traço foram submetidos ao ensaio de resistência a compressão axial apresentando em média para CC 21,02 MPa e para CAR 95,09 MPa. Os materiais de ambos os traços foram cominuídos através de um britador de mandíbula ajustado para granulometria menor que 19,1 mm e retido em 4,75 mm. Com isso, foram realizados ensaios de granulometria de cada traço, e misturados em volumes iguais para o beneficiamento do material. Os primeiros ensaios foram realizados no jigue a ar, porém os resultados apresentados foram insatisfatórios. Para o jigue à água ocorreu uma separação visível de 3 estágios (Topo, Meio e Fundo) Utilizando somente as camadas de topo e fundo, os agregados reciclados de concreto (ARC) foram utilizados para confecção de novos concretos. Os resultados apontaram que a aplicação do jigue à água possibilitou um beneficiamento do material para uso como agregado graúdo. Os ensaios de resistência à compressão, os concretos produzidos com a camada de fundo do agregado reciclado superaram os produzidos com agregado natural. Nos ensaios de módulo de elasticidade, os concretos com o agregado natural exibiram resultados melhores do que os reciclados do topo, porém para os concretos produzidos com os agregados do fundo, os módulos se igualaram aos dos concretos com agregado natural. No ensaio de absorção, o concreto reciclado mostrou uma absorção maior que o concreto natural. Para a carbonatação os concretos com agregados reciclados tiveram melhores resultados. As avaliações dos efeitos foram concludentes para o uso do jigue no beneficiamento do agregado reciclado de concreto (ARC). / The present work evaluates the feasibility of using Construction and Demolition Waste (CDW) generated by two different concrete mixes, one being aconventional concrete-CC (mix:mass: 1:2, 94:3, 56, w/c: 0,61) using CP IV 32, and another being a high strength concrete - CAR (mix:mass: 1:1, 11:2, w/c: 0.22), with the addition of additive and red pigment) using cement CP V-ARI. After 28 days of curing, three test specimens of each concrete were submitted to the resistance test, presenting 21.02 MPa on average for CC and 95.09 Mpa for CAR. The materials of both mixes were comminuted by jaw crusher, and sieved to a particle size range of -19.1 mm + 4.75 mm. With this, granulometry, tests of each concrete were performed and the concretes were mixed in equal volumes for the application of the material processing. The first tests were performed by air jig, but the results were found to be unsatisfactory A visible separation of 3 stages (Top, Middle and Bottom) was achieved by use of water jig. Using only the top and bottom layers, Recycled Concrete Aggregates (RCA) was added for the creation of new concrete. The results indicate that the application of the water jig made it possible to improve the material for use as a large aggregate. For the compressive strength tests, the concretes produced with the bottom layer of the recycled aggregate surpassed those produced with natural aggregate. In the modulus of elasticity tests, concretes with the natural aggregate presented better results than those recycled from the top. For the concretes produced with the bottom aggregates, the modules matched that of the concrete with natural aggregate. In the absorption test the recycled concrete showed a higher absorption than the natural concrete. For carbonation the recycled had better results. An evaluation of the results concludes in favor of the use of water jig for the recycling of concrete aggregates (RCA).

<p>U disertaciji su prikazani rezultati sopstvenog eksperimentalnog istraživanja mogućnosti primjene biopepela, nastalog sagorjevanjem žetvenih ostataka, kao mineralnog dodatka u cementnim kompozitima: malterima i betonima. Istraživanje je zasnovano na komparativnoj analizi 27 vrsta maltera u kojima je varirana vrsta biopepela i vrsta sitnozrnog agregata i 12 vrsta betona koje se razlikuju u vrsti veziva i u krupnom agregatu. Na očvrslom malteru su ispitani: konzistencija, čvrstoća pri pritisku i kapilarno upijanje vode, a na očvrslom betonu ispitivani su kapilarno upijanje vode, skupljanje pri sušenju, čvrstoća pri pritisku, dinamički modul elastičnosti, otpornost na habanje, vodonepropustljivost i čvrstoća na savijanje. Istaknuto je da se primjenom biopepela kao zamjene dijela cementa mogu dobiti konstrukcijski malteri i betoni, odnosno betoni sa zadovoljavajućim fizičkim i mehaničkim karakteristikama.</p> / <p>The dissertation presents the results of an own experimental research on the possibility of using biomass ash as a mineral additive in cement composites: mortar and concrete. The research is based on a comparative analysis of 27 types of mortars in which the type of biomass ash and the type of fine-grained aggregate were varied, as well as 12 types of concrete that differ in the type of binder and coarse aggregate. Following properties were tested on hardened mortars: consistency, compressive strength and capillary water absorption, and on hardened concrete: capillary water absorption, drying shrinkage, compressive strength, dinamic modulus of elasticity, wear resistance, waterpermeability and flexural strength. It was pointed out that biomass ash can be used as a replacement of a part of cement, thereby obtaining satisfactory physical and mechanical characteristics.</p>

O presente trabalho avaliou a viabilidade do uso de Resíduos de Construção e Demolição (RCD) provenientes da geração de dois traços de concretos distintos. Um Concreto Convencional-CC (traço em massa:1:2,94:3,56; a/c:0,61) utilizando cimento CP IV 32 e outro concreto de Alta Resistência-CAR (traço em massa:1:1,11:2; a/c: 0,22; com adição, aditivo e pó xadrez vermelho) utilizando cimento CP V-ARI. Após 28 dias de cura, 3 corpos de prova de cada traço foram submetidos ao ensaio de resistência a compressão axial apresentando em média para CC 21,02 MPa e para CAR 95,09 MPa. Os materiais de ambos os traços foram cominuídos através de um britador de mandíbula ajustado para granulometria menor que 19,1 mm e retido em 4,75 mm. Com isso, foram realizados ensaios de granulometria de cada traço, e misturados em volumes iguais para o beneficiamento do material. Os primeiros ensaios foram realizados no jigue a ar, porém os resultados apresentados foram insatisfatórios. Para o jigue à água ocorreu uma separação visível de 3 estágios (Topo, Meio e Fundo) Utilizando somente as camadas de topo e fundo, os agregados reciclados de concreto (ARC) foram utilizados para confecção de novos concretos. Os resultados apontaram que a aplicação do jigue à água possibilitou um beneficiamento do material para uso como agregado graúdo. Os ensaios de resistência à compressão, os concretos produzidos com a camada de fundo do agregado reciclado superaram os produzidos com agregado natural. Nos ensaios de módulo de elasticidade, os concretos com o agregado natural exibiram resultados melhores do que os reciclados do topo, porém para os concretos produzidos com os agregados do fundo, os módulos se igualaram aos dos concretos com agregado natural. No ensaio de absorção, o concreto reciclado mostrou uma absorção maior que o concreto natural. Para a carbonatação os concretos com agregados reciclados tiveram melhores resultados. As avaliações dos efeitos foram concludentes para o uso do jigue no beneficiamento do agregado reciclado de concreto (ARC). / The present work evaluates the feasibility of using Construction and Demolition Waste (CDW) generated by two different concrete mixes, one being aconventional concrete-CC (mix:mass: 1:2, 94:3, 56, w/c: 0,61) using CP IV 32, and another being a high strength concrete - CAR (mix:mass: 1:1, 11:2, w/c: 0.22), with the addition of additive and red pigment) using cement CP V-ARI. After 28 days of curing, three test specimens of each concrete were submitted to the resistance test, presenting 21.02 MPa on average for CC and 95.09 Mpa for CAR. The materials of both mixes were comminuted by jaw crusher, and sieved to a particle size range of -19.1 mm + 4.75 mm. With this, granulometry, tests of each concrete were performed and the concretes were mixed in equal volumes for the application of the material processing. The first tests were performed by air jig, but the results were found to be unsatisfactory A visible separation of 3 stages (Top, Middle and Bottom) was achieved by use of water jig. Using only the top and bottom layers, Recycled Concrete Aggregates (RCA) was added for the creation of new concrete. The results indicate that the application of the water jig made it possible to improve the material for use as a large aggregate. For the compressive strength tests, the concretes produced with the bottom layer of the recycled aggregate surpassed those produced with natural aggregate. In the modulus of elasticity tests, concretes with the natural aggregate presented better results than those recycled from the top. For the concretes produced with the bottom aggregates, the modules matched that of the concrete with natural aggregate. In the absorption test the recycled concrete showed a higher absorption than the natural concrete. For carbonation the recycled had better results. An evaluation of the results concludes in favor of the use of water jig for the recycling of concrete aggregates (RCA).

O presente trabalho avaliou a viabilidade do uso de Resíduos de Construção e Demolição (RCD) provenientes da geração de dois traços de concretos distintos. Um Concreto Convencional-CC (traço em massa:1:2,94:3,56; a/c:0,61) utilizando cimento CP IV 32 e outro concreto de Alta Resistência-CAR (traço em massa:1:1,11:2; a/c: 0,22; com adição, aditivo e pó xadrez vermelho) utilizando cimento CP V-ARI. Após 28 dias de cura, 3 corpos de prova de cada traço foram submetidos ao ensaio de resistência a compressão axial apresentando em média para CC 21,02 MPa e para CAR 95,09 MPa. Os materiais de ambos os traços foram cominuídos através de um britador de mandíbula ajustado para granulometria menor que 19,1 mm e retido em 4,75 mm. Com isso, foram realizados ensaios de granulometria de cada traço, e misturados em volumes iguais para o beneficiamento do material. Os primeiros ensaios foram realizados no jigue a ar, porém os resultados apresentados foram insatisfatórios. Para o jigue à água ocorreu uma separação visível de 3 estágios (Topo, Meio e Fundo) Utilizando somente as camadas de topo e fundo, os agregados reciclados de concreto (ARC) foram utilizados para confecção de novos concretos. Os resultados apontaram que a aplicação do jigue à água possibilitou um beneficiamento do material para uso como agregado graúdo. Os ensaios de resistência à compressão, os concretos produzidos com a camada de fundo do agregado reciclado superaram os produzidos com agregado natural. Nos ensaios de módulo de elasticidade, os concretos com o agregado natural exibiram resultados melhores do que os reciclados do topo, porém para os concretos produzidos com os agregados do fundo, os módulos se igualaram aos dos concretos com agregado natural. No ensaio de absorção, o concreto reciclado mostrou uma absorção maior que o concreto natural. Para a carbonatação os concretos com agregados reciclados tiveram melhores resultados. As avaliações dos efeitos foram concludentes para o uso do jigue no beneficiamento do agregado reciclado de concreto (ARC). / The present work evaluates the feasibility of using Construction and Demolition Waste (CDW) generated by two different concrete mixes, one being aconventional concrete-CC (mix:mass: 1:2, 94:3, 56, w/c: 0,61) using CP IV 32, and another being a high strength concrete - CAR (mix:mass: 1:1, 11:2, w/c: 0.22), with the addition of additive and red pigment) using cement CP V-ARI. After 28 days of curing, three test specimens of each concrete were submitted to the resistance test, presenting 21.02 MPa on average for CC and 95.09 Mpa for CAR. The materials of both mixes were comminuted by jaw crusher, and sieved to a particle size range of -19.1 mm + 4.75 mm. With this, granulometry, tests of each concrete were performed and the concretes were mixed in equal volumes for the application of the material processing. The first tests were performed by air jig, but the results were found to be unsatisfactory A visible separation of 3 stages (Top, Middle and Bottom) was achieved by use of water jig. Using only the top and bottom layers, Recycled Concrete Aggregates (RCA) was added for the creation of new concrete. The results indicate that the application of the water jig made it possible to improve the material for use as a large aggregate. For the compressive strength tests, the concretes produced with the bottom layer of the recycled aggregate surpassed those produced with natural aggregate. In the modulus of elasticity tests, concretes with the natural aggregate presented better results than those recycled from the top. For the concretes produced with the bottom aggregates, the modules matched that of the concrete with natural aggregate. In the absorption test the recycled concrete showed a higher absorption than the natural concrete. For carbonation the recycled had better results. An evaluation of the results concludes in favor of the use of water jig for the recycling of concrete aggregates (RCA).