Thesis (M.S.)--Auburn University, 2008. / Abstract. Vita. Includes bibliographical references.

Neste trabalho foi estudada a degradação anaeróbia do alquilbenzeno linear sulfonado (LAS), um surfactante largamente utilizado na fabricação de detergentes e presente em águas residuárias domésticas e industriais. Para isso, foram utilizados dois reatores anaeróbios horizontais de leito fixo (RAHLF) preenchidos com diferentes materiais suporte para imobilização da biomassa: carvão vegetal (RAHLF1) e leito misto de argila expandida e espuma de poliuretano (RAHLF2). O inóculo usado foi lodo proveniente de reator anaeróbio de fluxo ascendente e manta de lodo (UASB) utilizado no tratamento de águas residuárias de suinocultura. Os reatores foram alimentados, numa primeira etapa, com esgoto sintético e, posteriormente, suplementados com 14 mg/L de LAS. O tempo de detenção hidráulica (TDH) utilizado foi de 12 horas. Foi possível constatar que a presença do surfactante na alimentação não afetou a remoção de matéria orgânica (DQO), próxima a 90% em ambos os reatores para afluente com DQO de 550 mg/L. Com o balanço de massa constatou-se que os reatores foram aptos a remover LAS em 30% no RAHLF1 e 35% no RAHLF2. Desse total, 28% e 27%, respectivamente, foram degradados biologicamente, após 343 dias de operação. O restante manteve-se adsorvido nos materiais suportes. O pH no efluente dos RAHLFs manteve-se constante e próximo a 7,0. Alcalinidade foi gerada, assim como ácidos voláteis, apresentando concentrações médias de 342 e 353 mgCaCO3/L e 27 e 24 mgHAc/L no RAHLF1 e RAHLF2, respectivamente, durante operação com 14 mg/L de LAS no afluente. Ácidos acético e propiônico foram observados nos reatores em concentrações de até 50 e 12 mg/L, respectivamente. Em ambos os reatores estiveram presentes microrganismos com morfologias semelhantes a Methanosarcina sp., Methanosaeta sp., bacilos, cocos e filamentos, entre outros. Utilizando-se técnicas de Biologia Molecular (PCR/DGGE) verificou-se, em ambos os reatores, ampla variedade populacional de microrganismos pertencentes aos Domínios Bacteria, Archaea e ao Grupo BRS. Os materiais suportes selecionaram o crescimento de diferentes populações microbianas. No entanto, para o RAHLF2, praticamente não ocorreu estratificação populacional para os dois suportes. No RAHLF1, algumas populações foram semelhantes às observadas no reator de leito misto e outras cresceram mais favoravelmente / The aim of this work was to study the anaerobic degradation of LAS (linear alquilbenzene sulphonate), which is a surfactant widely used in manufacture of detergents and commonly found in domestic and industrial wastewaters. For the experimental purpose it was used two horizontal anaerobic immobilized biomass (HAIB) reactors filled with different support materials for biomass immobilization, such as: vegetal coal (HAIB1) and a mix of expanded clay and polyurethane foam (HAIB2). The biological material used as inoculum was obtained with the sludge of an upflow anaerobic sludge blanket reactor (UASB) treating suine wastewater. The reactors were fed, in a first stage, with synthetic sewage and, in a second, with a synthetic sewage supplemented with 14 mg/L of LAS. The applied hydraulic detention time was of 12 hours. With the chemical routine analyses it was possible to ascertain the evidence that the presence of surfactant in the feeding influent did not affect organic matter removal efficiencies (COD), which were close to 90% for both reactors treating 550 mg/L COD. The mass balance results suggested that the reactors removal efficiency of LAS were of 30% in RAHLF1 and 35% in RAHLF2. Of the total concentration of used LAS in the experiments, 28% and 27% were degraded biologically after 343 days of operating regime. The remaining LAS concentrations were adsorbed on the support materials. The pH values in the systems remained unaltered and close to 7.0. Alkalinity was generated (342 and 353 mgCaCO3/L, respectively), and volatile acids were recorded at concentrations of 24 and 27 mgHAc/L in RAHLF1 and RAHLF2, respectively, both treating effluent containing 14 mg/L of LAS. Acetic and propionic acids were detected in the reactors at concentrations up to 50 and 12 mg/L, for reactors 1 and 2, respectively. In both reactors it was observed microorganisms with morphologies resembling Methanosarcina sp., Methanosaeta sp., rods, cocus, filaments and others. Techniques of Molecular Biology (PCR/DGGE) showed high diversity of Bacteria, Archaea and BRS Group in both reactors. The support material selected different microbial populations. For RAHLF2, however, microbial stratification when using the distinct support material was not observed. In RAHLF1, it was observed that some populations were similar within the reactor of mixing bed where others grew more favorably

<p>To make bacterial-based self-healing concrete, alkaline-resistant bacterial spores, nutrient sources, and a calcium source are incorporated into a concrete matrix. Two ureolytic spore-forming bacteria, <i>Sporosarcina pasteurii</i>, <i>Lysinibacillus sphaericus</i>, and two non-ureolytic spore-forming bacteria, <i>Bacillus cohnii</i>, and <i>Bacillus pseudofirmus</i>, which have been used in previous studies as bacterial concrete healing agents, were compared in this study. The four bacteria were compared for their (1) sporulation rates on different sporulation agar plates, (2) growth in five liquid media, (3) survival rates in light weight aggregates (LWA) and in mortar samples, and (4) calcium carbonate precipitation rates from either calcium lactate or calcium nitrate. Sporulation was successfully induced after three-day incubation at 30°C on an appropriate sporulation medium. High sporulation rates of <i>B. cohnii</i>, and <i>B. pseudofirmus</i>(93% and 99% respectively) were found on alkaline R2A medium (AR2A). A sporulation rate (89%) of <i>S. pasteruii</i>was observed on tryptic soy agar supplemented with 2% urea (TSAU)<i>.</i>The highest sporulation rate (60%) of <i>L. sphaericus</i>was found on R2A medium supplemented with 2% urea (R2AU). In the growth study, tryptic soy broth supplemented with 2% urea (TSBU) was a positive control which supported rapid growth of all four bacteria. <i>Sporosarcina pasteurii </i>and <i>L. pasteurii</i>showed rapid growth rates in alkaline yeast extract broth (AYE) and yeast extract with 2% urea broth (YEU) respectively. In contrast, <i>B. cohnii</i>, and <i>B. pseudofirmus</i>grew poorly in all media except in the positive control. Viable counts of the four bacterial spores reduced (1.8–3.3 logs) during the first 24 h in mortar samples and then remained stable for next 27 days testing period. Among the four, <i>S. pasteurii</i>showed the smallest reduction of viable counts (1.8–2.5 logs) in mortar after one day of incubation. Both <i>S. pasteurii</i>and <i>L. sphaericus</i>showed high CaCO₃productions (>80%) after 24 h incubation at 30°C in YEU containing either calcium nitrate or calcium lactate. However, <i>B. pseudofirmus</i>and <i>B. cohnii </i>showed<i></i>low calcite recovery rates (<11%) in AYE containing either<i></i>calcium nitrate or calcium lactate under the same incubation condition. Overall, <i>S. pasteurii</i>was the best bacterial concrete healing agent of the four. This bacterium had (1) rapid growth rate in AYE, (2) about 90% sporulation rate within 3 days, (3) highest survival rates after 24 h in mortar samples and, (4) high CaCO₃precipitation rates, 82 or 98%, in broth containing calcium nitrate or calcium lactate respectively.</p><p>In addition, two different lightweight aggregates (LWA), expanded shale (ES) and expanded clay (EC), which were used as bacterial carriers and protective materials, were compared in this study. Each type of LWA was separated into three sizes (<0.85 mm, 0.85– 2.0 mm, and >2.0 mm) and immobilized with spores of <i>B. cohnii</i>or <i>B. pseudofirmus.</i>Viable counts recovered from EC and ES reduced <1.0 log after the immobilization process and remained stable during the 150 days testing period. Neither the type nor the particle sizes of the two LWA significantly affected the survival rates of the bacterial spores. This result showed that both EC and ES could be used as carriers for bacterial healing agents. It was also found that when the spores were immobilized with nutrients in LWA, their survival rates in mortar samples can be improved slightly (<1.0 log).</p><p><br></p>

Esta tese aborda as influências do agregado leve na dosagem, características físicas e mecânicas de concreto autoadensável (CAA) quando na fração de graúdo da mistura, substitui-se parte do volume absoluto da brita de basalto (máx 19 mm) pelo volume equivalente de argila expandida brasileira (máx 12,7 mm). O fato de conhecer as implicações na reologia do CAA, provocadas pelo uso conjunto de agregados com características físicas distintas e, apresentar este tipo de concreto como uma alternativa promissora para uso na indústria da pré-fabricação em concreto, justificam esta pesquisa. A substituição da brita de basalto pela argila expandida (AE-1506), em teores de volume absoluto, foi de 20%, 40%, 60%, 80% e 100%. Como resultados, produziram-se concretos autoadensáveis com consumo de aglomerantes (cimento Portland CP V-ARI e sílica ativa) da ordem de 510 kg/m³, que atenderam aos limites de autoadensabilidade propostos pela norma NBR 15823-1 (2010). Na condição endurecida, apresentaram massa específica seca de 2.358,3 a 1.720,7 kg/m³, resistência à compressão (fc28) de 60 a 43 MPa, módulo de elasticidade (Esc) de 23 a 34 GPa e eficiência estrutural (FEE) de 22 a 29 MPa.dm³.kg-1, sem sinais visíveis de frente de carbonatação. Obteve-se concreto leve autoadensável (CLAA) a partir de misturas com fração de graúdo foi composta por 60% de argila expandida e 40% de brita de basalto, que atingiram massa específica seca de 1.986 kg/m³, resistência a compressão (fc28) de 51,3 MPa e condutividade térmica () de 1,07 a 1,53 W/m.K. Constatou-se que a argila expandida interfere significativamente nas características dos concretos exigindo, na comparação com CAA confeccionado com 100% de brita de basalto, maior teor de argamassa e relação volume de água/volume de finos mais elevado. / This thesis discusses aspects related to the influence of lightweight aggregate in the mix design, physical and mechanical properties of the self-compacting concrete (SCC) when replacing part of the absolute volume of basalt crushed stone (máx19 mm) with a lightweight aggregate equivalent absolute volume Brazilian expanded clay (máx 12,7 mm). Understanding interference on the rheology of the SCC caused by the use of aggregates with different physical properties and recommend this type of concrete as a promising alternative for the pre-fabricated concrete industry, justify this research. The replacement of basalt crushed stone for lightweight aggregate (AE-1506), in equivalent absolute volume, was 20%, 40%, 60%, 80% and 100%. As a result, self-compacting concrete was produced with consumption of binders (cement Portland CP V-ARI and silica fume) of about 510 kg / m³, appropriate for self- compactibility limits established by the ABNT NBR 15823-1 (2010) standard. In the hardened condition, the dry density value ranged from 2.358,3 to 1.720,7 kg/m³, compressive strength (fc28) ranged from 60 to 43 MPa, elasticity modulus (Esc) ranged from 23 to 34 GPa, and efficiency structural (FES) ranged from 22 to 29 MPa.dm³.kg-1, with no visible signs of carbonation. The self-compacting lightweight expanded clay concrete (SCLC) was obtained from mixtures which its absolute volume fraction of aggregate coarse was composed by 60% of expanded clay and 40% of basalt crushed stone, with dry density of 1986 kg/m³, compressive strength (fc28) of 51.3 MPa and thermal conductivity () varied from 1,07 to 1,53 W/m.K. It was found that the expanded clay significantly interferes in the properties of concretes demanding in comparison with SCC made with 100% basalt crushed stone, mortar content and ratio higher volume of water/volume of higher fines.

Two active mineral additives were selected in the investigation described in the dissertation: unground catalyst from the reactor of catalytic oil cracking (CAT) and unburned mullite wool (MW). The possibilities to utilise these raw materials in the production of the expanded-clay lightweight concrete are not analysed yet. Main topic of the research: influence of the active mineral additives (CAT and MW) on the main characteristics of the expanded-clay lightweight concrete. / Disertacijoje aprašytuose tyrimuose buvo pasirinkti du aktyvūs mineraliniai priedai: nemaltas katalizatorius iš katalitinio naftos krekingo reaktoriaus (KAT) ir nedegta mulitinė vata (MV). Galimybės šias atliekas naudoti keramzitbetonio gamyboje iki šiol netirtos. Pagrindinė tyrimo tematika – aktyviųjų mineralinių priedų (KAT ir MV) įtaka pagrindinėms keramzitbetonio charakteristikoms.

Disertacijoje aprašytuose tyrimuose buvo pasirinkti du aktyvūs mineraliniai priedai: nemaltas katalizatorius iš katalitinio naftos krekingo reaktoriaus (KAT) ir nedegta mulitinė vata (MV). Galimybės šias atliekas naudoti keramzitbetonio gamyboje iki šiol netirtos. Pagrindinė tyrimo tematika – aktyviųjų mineralinių priedų (KAT ir MV) įtaka pagrindinėms keramzitbetonio charakteristikoms. / Two active mineral additives were selected in the investigation described in the dissertation: unground catalyst from the reactor of catalytic oil cracking (CAT) and unburned mullite wool (MW). The possibilities to utilise these raw materials in the production of the expanded-clay lightweight concrete are not analysed yet. Main topic of the research: influence of the active mineral additives (CAT and MW) on the main characteristics of the expanded-clay lightweight concrete.

Made available in DSpace on 2014-12-17T14:06:49Z (GMT). No. of bitstreams: 1 MauricioRP.pdf: 769557 bytes, checksum: 64ad674a4bbb41883e038d57b445215c (MD5) Previous issue date: 2008-11-10 / Lightweight concrete has been the subject of several studies towards the development of new building materials. Emphasis has been given on the particle size effect and nature of aggregates used as raw materials. The present study includes an analysis of the materials that make this kind of concrete, analyzes of mechanical properties such as compressive and tensile strength, in addition to assessments of the interface concrete aggregate/matrix interface, porosity and absorption profile of chloride ions in lightweight concrete based on expanded clay. The experiments were carried out by molding cylindrical samples 100 mm in diameter and 200 mm in height. The dosage experiments were performed without additives or with the addition of minerals: (T1) 1: 2.01: 1.10: 0.78 (T2) 1: 2.00: 1.32 : 0.62 - (T3) 1 :1.93 :1.54: 0.47 (cement : sand : expanded clay 0500 : expanded clay 1506).The water to cement ratio was set to 0.43. Expanded clay minerals with different average particle sizes were used, i.e., 9.5 mm/0500 and 19 mm/1506. The larger aggregate was coated by a glassy layer, yielding lower water absorption characteristics to the concrete. The results showed that the use of light expanded clay aggregates is a technically interesting solution to the production of lightweight concrete for construction applications / Considerando-se as tend?ncias de novos materiais na Constru??o Civil, o concreto leve tem sido objeto de v?rios trabalhos, com ?nfase na granulometria e suas mat?rias primas. Incluem-se neste estudo a altera??o de tra?os e dos materiais que comp?em esse concreto, analisando altera??es nas propriedades mec?nicas como resist?ncia ? compress?o e tra??o por compress?o diametral, al?m da interface agregado/matriz, porosidade e perfil de absor??o de ?ons cloreto no concreto leve ? base de argila expandida. Os experimentos foram realizados atrav?s de moldagem de corpos de prova cil?ndricos, com 100 mm de di?metro e 200 mm de altura. A dosagem experimental foi efetuada sem aditivos ou adi??es minerais, nos tra?os unit?rios em massa: (T1) 1 : 2,01 : 1,10 : 0,78 (T2) 1 : 2,00 : 1,32 : 0,62 - (T3) 1 : 1,93 : 1,54 : 0,47 (cimento : areia : argila expandida 0500 : argila expandida 1506); fixando-se a rela??o ?gua/cimento em 0,43. Para tanto, utilizou-se como agregado gra?do uma argila expandida, nas gradua??es 9,5 mm/0500 e 19 mm/1506. A argila de gradua??o maior era revestida com uma camada vitrificada, o que propiciou menor absor??o de ?gua pelo concreto. Os resultados mostraram que a utiliza??o da argila expandida como agregado leve ? uma solu??o tecnicamente vi?vel na produ??o de concreto leve para Constru??o Civil.

Neste trabalho foi estudada a degradação anaeróbia do alquilbenzeno linear sulfonado (LAS), um surfactante largamente utilizado na fabricação de detergentes e presente em águas residuárias domésticas e industriais. Para isso, foram utilizados dois reatores anaeróbios horizontais de leito fixo (RAHLF) preenchidos com diferentes materiais suporte para imobilização da biomassa: carvão vegetal (RAHLF1) e leito misto de argila expandida e espuma de poliuretano (RAHLF2). O inóculo usado foi lodo proveniente de reator anaeróbio de fluxo ascendente e manta de lodo (UASB) utilizado no tratamento de águas residuárias de suinocultura. Os reatores foram alimentados, numa primeira etapa, com esgoto sintético e, posteriormente, suplementados com 14 mg/L de LAS. O tempo de detenção hidráulica (TDH) utilizado foi de 12 horas. Foi possível constatar que a presença do surfactante na alimentação não afetou a remoção de matéria orgânica (DQO), próxima a 90% em ambos os reatores para afluente com DQO de 550 mg/L. Com o balanço de massa constatou-se que os reatores foram aptos a remover LAS em 30% no RAHLF1 e 35% no RAHLF2. Desse total, 28% e 27%, respectivamente, foram degradados biologicamente, após 343 dias de operação. O restante manteve-se adsorvido nos materiais suportes. O pH no efluente dos RAHLFs manteve-se constante e próximo a 7,0. Alcalinidade foi gerada, assim como ácidos voláteis, apresentando concentrações médias de 342 e 353 mgCaCO3/L e 27 e 24 mgHAc/L no RAHLF1 e RAHLF2, respectivamente, durante operação com 14 mg/L de LAS no afluente. Ácidos acético e propiônico foram observados nos reatores em concentrações de até 50 e 12 mg/L, respectivamente. Em ambos os reatores estiveram presentes microrganismos com morfologias semelhantes a Methanosarcina sp., Methanosaeta sp., bacilos, cocos e filamentos, entre outros. Utilizando-se técnicas de Biologia Molecular (PCR/DGGE) verificou-se, em ambos os reatores, ampla variedade populacional de microrganismos pertencentes aos Domínios Bacteria, Archaea e ao Grupo BRS. Os materiais suportes selecionaram o crescimento de diferentes populações microbianas. No entanto, para o RAHLF2, praticamente não ocorreu estratificação populacional para os dois suportes. No RAHLF1, algumas populações foram semelhantes às observadas no reator de leito misto e outras cresceram mais favoravelmente / The aim of this work was to study the anaerobic degradation of LAS (linear alquilbenzene sulphonate), which is a surfactant widely used in manufacture of detergents and commonly found in domestic and industrial wastewaters. For the experimental purpose it was used two horizontal anaerobic immobilized biomass (HAIB) reactors filled with different support materials for biomass immobilization, such as: vegetal coal (HAIB1) and a mix of expanded clay and polyurethane foam (HAIB2). The biological material used as inoculum was obtained with the sludge of an upflow anaerobic sludge blanket reactor (UASB) treating suine wastewater. The reactors were fed, in a first stage, with synthetic sewage and, in a second, with a synthetic sewage supplemented with 14 mg/L of LAS. The applied hydraulic detention time was of 12 hours. With the chemical routine analyses it was possible to ascertain the evidence that the presence of surfactant in the feeding influent did not affect organic matter removal efficiencies (COD), which were close to 90% for both reactors treating 550 mg/L COD. The mass balance results suggested that the reactors removal efficiency of LAS were of 30% in RAHLF1 and 35% in RAHLF2. Of the total concentration of used LAS in the experiments, 28% and 27% were degraded biologically after 343 days of operating regime. The remaining LAS concentrations were adsorbed on the support materials. The pH values in the systems remained unaltered and close to 7.0. Alkalinity was generated (342 and 353 mgCaCO3/L, respectively), and volatile acids were recorded at concentrations of 24 and 27 mgHAc/L in RAHLF1 and RAHLF2, respectively, both treating effluent containing 14 mg/L of LAS. Acetic and propionic acids were detected in the reactors at concentrations up to 50 and 12 mg/L, for reactors 1 and 2, respectively. In both reactors it was observed microorganisms with morphologies resembling Methanosarcina sp., Methanosaeta sp., rods, cocus, filaments and others. Techniques of Molecular Biology (PCR/DGGE) showed high diversity of Bacteria, Archaea and BRS Group in both reactors. The support material selected different microbial populations. For RAHLF2, however, microbial stratification when using the distinct support material was not observed. In RAHLF1, it was observed that some populations were similar within the reactor of mixing bed where others grew more favorably

Esta tese aborda as influências do agregado leve na dosagem, características físicas e mecânicas de concreto autoadensável (CAA) quando na fração de graúdo da mistura, substitui-se parte do volume absoluto da brita de basalto (máx 19 mm) pelo volume equivalente de argila expandida brasileira (máx 12,7 mm). O fato de conhecer as implicações na reologia do CAA, provocadas pelo uso conjunto de agregados com características físicas distintas e, apresentar este tipo de concreto como uma alternativa promissora para uso na indústria da pré-fabricação em concreto, justificam esta pesquisa. A substituição da brita de basalto pela argila expandida (AE-1506), em teores de volume absoluto, foi de 20%, 40%, 60%, 80% e 100%. Como resultados, produziram-se concretos autoadensáveis com consumo de aglomerantes (cimento Portland CP V-ARI e sílica ativa) da ordem de 510 kg/m³, que atenderam aos limites de autoadensabilidade propostos pela norma NBR 15823-1 (2010). Na condição endurecida, apresentaram massa específica seca de 2.358,3 a 1.720,7 kg/m³, resistência à compressão (fc28) de 60 a 43 MPa, módulo de elasticidade (Esc) de 23 a 34 GPa e eficiência estrutural (FEE) de 22 a 29 MPa.dm³.kg-1, sem sinais visíveis de frente de carbonatação. Obteve-se concreto leve autoadensável (CLAA) a partir de misturas com fração de graúdo foi composta por 60% de argila expandida e 40% de brita de basalto, que atingiram massa específica seca de 1.986 kg/m³, resistência a compressão (fc28) de 51,3 MPa e condutividade térmica () de 1,07 a 1,53 W/m.K. Constatou-se que a argila expandida interfere significativamente nas características dos concretos exigindo, na comparação com CAA confeccionado com 100% de brita de basalto, maior teor de argamassa e relação volume de água/volume de finos mais elevado. / This thesis discusses aspects related to the influence of lightweight aggregate in the mix design, physical and mechanical properties of the self-compacting concrete (SCC) when replacing part of the absolute volume of basalt crushed stone (máx19 mm) with a lightweight aggregate equivalent absolute volume Brazilian expanded clay (máx 12,7 mm). Understanding interference on the rheology of the SCC caused by the use of aggregates with different physical properties and recommend this type of concrete as a promising alternative for the pre-fabricated concrete industry, justify this research. The replacement of basalt crushed stone for lightweight aggregate (AE-1506), in equivalent absolute volume, was 20%, 40%, 60%, 80% and 100%. As a result, self-compacting concrete was produced with consumption of binders (cement Portland CP V-ARI and silica fume) of about 510 kg / m³, appropriate for self- compactibility limits established by the ABNT NBR 15823-1 (2010) standard. In the hardened condition, the dry density value ranged from 2.358,3 to 1.720,7 kg/m³, compressive strength (fc28) ranged from 60 to 43 MPa, elasticity modulus (Esc) ranged from 23 to 34 GPa, and efficiency structural (FES) ranged from 22 to 29 MPa.dm³.kg-1, with no visible signs of carbonation. The self-compacting lightweight expanded clay concrete (SCLC) was obtained from mixtures which its absolute volume fraction of aggregate coarse was composed by 60% of expanded clay and 40% of basalt crushed stone, with dry density of 1986 kg/m³, compressive strength (fc28) of 51.3 MPa and thermal conductivity () varied from 1,07 to 1,53 W/m.K. It was found that the expanded clay significantly interferes in the properties of concretes demanding in comparison with SCC made with 100% basalt crushed stone, mortar content and ratio higher volume of water/volume of higher fines.

Orientadores: Rosa Cristina Cecche Lintz, Luísa Andréia Gachet Barbosa / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Tecnologia / Made available in DSpace on 2018-08-28T13:32:52Z (GMT). No. of bitstreams: 1 Verzegnassi_Emerson_M.pdf: 3873734 bytes, checksum: 73682762affd1136f183e9120a07a536 (MD5) Previous issue date: 2015 / Resumo: Com a descoberta de aditivos químicos e adições minerais muitos tipos diferentes de concreto surgiram ao longo das últimas décadas. Porém o peso próprio do concreto convencional é considerado a sua maior desvantagem. Com isso abre-se campo para um material que apesar de ser conhecido pelos romanos, era pouco utilizado, o concreto com agregados leves. Muitas pesquisas surgem e em aproximadamente duas décadas aparece o concreto autoadensável e mais recentemente o concreto leve autoadensável. Este trabalho propõe o estudo deste material ainda pouco explorado o concreto leve autoadensável. Para isso são produzidos concretos com argila expandida em duas granulometrias diferentes: uma graúda em substituição total ao agregado graúdo de massa normal e uma miúda em substituição parcial ao agregado miúdo. São elaboradas três famílias de traços de concreto com consumos diferentes de cimento, 320, 360 e 440 kg/m³ de concreto, e realizados ensaios no estado fresco (anel J, funil V e caixa L) e endurecido (resistências à compressão e à tração, determinação do módulo de elasticidade, absorção e densidade). Os concretos leves foram classificados como auto adensáveis e apresentaram bons resultados quanto ao fator de eficiência e resistência sendo possível estabelecer equações de correlação para seu módulo de elasticidade. Para os ensaios de densidade observaram-se concretos leves com massas mínimas de até 1550 kg/m³ e resistências à compressão superiores aos valores estipulados pela norma NBR NM 35 para as densidades apresentadas em todas as misturas / Abstract: With the discovery of admixtures and mineral additions many different types of concrete emerged over the last decades. But the own weight of conventional concrete is considered their biggest disadvantage. With this opens up the field for a material that despite being known to the Romans, it was little used, the concrete with lightweight aggregates. Much research and come in about two decades appears the self compacting concrete and more recently the lightweight concrete self compacting. This work proposes the study of this material still little explored concrete lightweight self compacting. For this are produced concrete with expanded clay in two different particle sizes: one coarse in total replacement of coarse aggregate of normal mass and a fine partially substituting fine aggregate. Are designed three families of concrete mixtures with different cement consumption, 320, 360 and 440 kg / m³ of concrete, and the tests carried out in the fresh state (ring J, V funnel and L box) and hardened (resistance to compression and traction , determining the modulus of elasticity, absorption, and density). The concretes were classified as self compacting and showed good results as to efficiency and resistance factor being possible to establish a correlation equations for its modulus of elasticity. For the density tests were observed concretes with minimum masses of up to 1550 kg / m³ and compressive strengths greater than those stipulated by NBR NM 35 standard for the densities presented in all mixtures / Mestrado / Tecnologia e Inovação / Mestre em Tecnologia