The reuse of crushed aggregates for producing structural concrete is a major concern especially when it comes to its strength and durability. This study evaluated recycled aggregate concrete (RAC) for its strength and durability under simulated environmental degradation in the form of wetting-drying (W-D) cycles. The study consisted of two phases, each involving the determination of the compressive strength and modulus of elasticity using the conventional method and also a nondestructive ultrasonic pulse velocity method (Pundit Lab). Phase 1 involved 7-day curing followed by 30 W-D cycles, while Phase 2 included 28-day cured samples subjected to 15 W-D cycles. It was found that RAC specimens subjected to W-D cycles had minimal degradation in strength, making the use of RAC in construction very promising. Results from Pundit Lab compared reasonably well with conventional test results, showing promise as a nondestructive tool for the evaluation of RAC properties. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2018. / FAU Electronic Theses and Dissertations Collection

Wick action is the transport of water through a concrete element from a face in contact with water to a drying face as occurs in basements, tunnels, slabs on grade and hollow offshore structures. Water transport through concrete due to wick action is many times greater due to pressure permeability under typical environmental conditions. Therefore wick action plays an important role in the watertightness and durability of concrete structures. Current models of wick action are based on an equilibrium developing between the rate of water entering concrete by sorptivity and leaving by water vapour diffusion where initial moisture content should not change the steady state rate, only the dominant factor in the early stages. / Wick action tests were conducted on concrete specimens of varying initial moisture condition, thickness, orientation and composition over periods ranging up to 450 days. Some wick action tests were conducted at 50% and 75% relative humidity and using a penetrating solution of reduced surface tension. The rate of wick action was found to be inversely proportional to thickness regardless of the initial moisture content of the specimen. Initial saturation was found to significantly increase wick action and moisture flow in ordinary Portland cement (OPC) and hydrophobic (HI) concretes drying at 75% RH and HI concrete drying at 50% RH. The data are consistent with the well documented hysteresis between sorption/desorption isotherms. Concretes containing silica fume (SF) and ground granulated blast-furnace slag (GGBS) did not exhibit such hysteresis. Reducing the surface tension of the pentrating solution profoundly reduced the sorptivity into dried specimens but not the depth of penetration or the steady state wick action rate. Direct measurements on osmotic flow through vacuum saturated specimens showed that osmotic effects had a limited effect on wick action at salt concentrations expected in most environmental conditions. / The research demonstrates that desorptivity from the drying surface rather than sorptivity into the wetting surface is the dominant factor determining wick action through concrete. The ease with which desorptivity can be measured and the simple empirical model developed provides practicising engineers with a useful tool to estimate water transport due to wick action through concrete in partially immersed conditions.

Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós-Graduação em Engenharia Oceânica, Escola de Engenharia, 2009. / Submitted by Lilian M. Silva (lilianmadeirasilva@hotmail.com) on 2013-04-20T20:31:09Z No. of bitstreams: 1 Estudo de viabilidade de empreendimento sob a ótica da vida útil O caso sobre a modernização do Porto Novo do Rio Grande – RS.pdf: 4308697 bytes, checksum: 19733200872e44b346c9b760ca0923d0 (MD5) / Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2013-06-04T16:55:51Z (GMT) No. of bitstreams: 1 Estudo de viabilidade de empreendimento sob a ótica da vida útil O caso sobre a modernização do Porto Novo do Rio Grande – RS.pdf: 4308697 bytes, checksum: 19733200872e44b346c9b760ca0923d0 (MD5) / Made available in DSpace on 2013-06-04T16:55:51Z (GMT). No. of bitstreams: 1 Estudo de viabilidade de empreendimento sob a ótica da vida útil O caso sobre a modernização do Porto Novo do Rio Grande – RS.pdf: 4308697 bytes, checksum: 19733200872e44b346c9b760ca0923d0 (MD5) Previous issue date: 2009 / A identificação do estado de conservação e manutenção, bem como, do obsoletismo funcional do cais do Porto Novo do Rio Grande, permitiu traçar diretrizes para a realização das obras de modernização desta estrutura. Em razãodo tipo de navios que atualmente navegam na costa brasileira, o projeto de modernização prevê a adequação dos berços de atracação e aprofundamento do calado, na linha próxima ao cais. O estudo da viabilidade para realizar tal empreendimento encontra-se alicerçado no potencial de funcionamento, ou seja, vida econômica e vida útil. Este trabalho apresenta relação entre a vida útil das estruturas de concreto, inseridas em ambientes marítimos, e os indicadores de viabilidade para este tempo de vida. São apresentadas as possibilidades de modernizar ou reabilitar cais com muro de gravidade, bem como, os fatores preponderantes na durabilidade de uma estrutura de concreto, como distância da água do mar, permitindo traçar estimativas quanto a vida útil destas estruturas. Estas estimativas estão baseadas, basicamente, no ambiente no qual estão inseridas e nas especificações de projeto como, cobrimento das armaduras e resistência característica do concreto. Foi observado um ganho considerável na vida útil da estrutura ao adotar-se a especificação do concreto com resistências características à compressão (fck) superiores. A partir desta premissa, o estudo dos indicadores de viabilidade foi baseado em duas possibilidades de horizontes: valor do investimento inicial com especificações do projeto utilizando fckigual a 35 MPa, com estimativa de vida útil de 56 anos e, alternativamente, o valor do custo do concreto com fck igual a 40 MPa agregado ao investimento, para o horizonte de 76 anos. Diante do panorama econômico e das séries históricas analisadas que compreendem o volume e tipo de cargas, número de embarcações que utilizam o cais e, das principais cargas movimentadas, foi identificado o volume anual e a mercadoria com maior movimentação, que corresponde a fertilizantes. A partir destas constatações, realizou-se o levantamento provável de despesas e receitas decorrentes da operação exclusiva no cais, compondo o fluxo de caixa do empreendimento, com cenário provável, pessimista e otimista. Os indicadores de viabilidade analisados foram: Valor Presente Líquido, Taxa Interna de Retorno, Índice de Lucratividade e Pay-back. As incertezas e riscos foram analisados através da geração analítica e numérica do VPL, fornecendo parâmetros para a tomada de decisão, com indicativo de viabilidade para a realização dasobras de recuperação e modernização do cais do Porto Novo do Rio Grande no horizonte de 76 anos. / The identification of the state of conservation andmaintenance as well as the functional obsoletism of the dock of Porto Novo do Rio Grande, allowed establish guidelines in order to perform the modernization work of this structure. Because of the type of vessels currently sailing along the Brazilian coast, the modernization project foresees the adequacy of the berthing cradles and deepening the draft in line next to the pier. The study of the feasibility to undertake such enterprise is based on the functioning potential, that is, economic and useful life. This paper presents relationship between the life of concrete structures, inserted in the marine environment, and indicators of viability for this time of life. The opportunities to upgrade or rehabilitate pier with gravity wall are presented as well as the predominant factors in the durability of a concretestructure, such as distance from the sea, allowing trace estimates of useful life of these structures. These estimates are based, basically, on the environment in which they are inserted and the project specifications, such as armor cover and the characteristic strength of concrete. It was observed a considerable gain in the lifetime of the structure by adopting the concrete specification with higher characteristic strength (fck). From this premise, the study of indicators of viability was based on two types of horizons: value of initial investment with the project specifications using fckequal to 35 MPa, estimated useful life of 56 years and, alternatively, the cost value of the concrete with fck equal to 40 MPa aggregated to the investment, for the horizon of 76 years. Considering the economic outlook and the analyzed historical seriesthat comprises the volume and type of loads, number of vessels using the wharf and the main cargo handled, the annual volume and the goods with more movement were identified, whichis fertilizer. From these findings, a survey of likely income and expenditure arising from the exclusive operation on the pier was undertaken, comprising the cash flow of the enterprise, with probable, pessimistic and optimistic scenario. The analyzed indicators of feasibility were: Net Present Value, Internal Rate of Return, Profitability Index and Pay-back. The uncertainties and risks were analyzed through the analytical and numerical generation of NPV, providing parameters for the decision, with an indication of viability to perform the works of rehabilitation and upgrading of Porto Novo Rio Grande's pier on the horizon of 76 years.

Alkali-Aggregate Reaction (AAR) is one of the most harmful distress mechanisms affecting the serviceability and durability of concrete critical infrastructure worldwide. Over the past decades, several approaches and recommendations have been developed to assess the potential reactivity of aggregates in the laboratory and the efficiency of preventive measures (e.g., supplementary cementing materials – SCMs) to mitigate ASR in the field. Yet, recent findings suggest that the appropriate use of SCMs “only” delayed and does not entirely prevent ASR occurrence. Moreover, once ASR starts in the field, there is no “universal” solution that should be applied in various cases, and each situation should be evaluated as “unique”. Nevertheless, artificially triggering healing agents have been studied in the late years, thus presenting an interesting “physical” solution to reduce the ingress of water and recover damaged concrete elements, which could present an interesting solution for durability-related distress due to ASR. This Ph.D. project focuses on detailed laboratory investigations aiming first to understand the self-healing process of concrete (i.e., by the natural or engineered process). Then, its further influence on ASR-induced expansion and deterioration, either applied internally or externally to the concrete. To achieve this goal, concrete mixtures presenting a wide range of binder compositions, using distinct types of chemical admixtures (e.g., crystalline self-healing), and incorporating five different types/nature of highly reactive aggregates (i.e., coarse and fine) were combined to manufactured concrete specimens in the laboratory. Otherwise, in aging specimens, concrete samples were designed only with GU-cement as the binder material but incorporated two different types/nature of highly reactive aggregates. Then, the samples were exposed to ASR-induced development until they reached pre-determined expansion levels, in which a wide range of sealers and coating materials were applied on the surface of the affected specimens. Mechanical (i.e., stiffness damage test, modulus of elasticity, micro indentation, shear and compressive strengths) and microscopic (damage rating index and scanning electron microscopy) tests were performed on samples at different ages (up to two years of accelerated ASR development). The results show that besides changing AAR-kinetics, the different binder compositions or the chemical admixtures could modify the distress mechanism due to AAR. The addition of crystalline healing agents or their combination with SCMs in concrete not only delayed the development of inner damage but significantly lowered the compressive strength loss at equivalent expansion amplitudes than control specimens. Moreover, the combination of different binder materials modified the chemical and mechanical properties of the ASR-gel, changing its swelling properties and the further damage development in concrete. On the other hand, the wide range of surface treatments used were not able to alter ASR distress mechanism; yet, they changed ASR-kinetics. Moreover, their effectiveness to slower the reaction shows to be significantly influenced by the damage degree to which the surface treatment is applied. Finally, a comprehensive framework enabling the optimized selection of raw materials to prevent or mitigate ASR development is proposed.

Thesis (MScEng)--Stellenbosch University, 2011. / ENGLISH ABSTRACT: A major challenge for our society is the protection of the environment. Some of the important issues are the reduction in the consumption of energy and natural raw materials, as well as the increase in consumption of waste materials. At present these topics are getting considerable attention as part of sustainable development programs. The use of recycled concrete aggregates (RCA) from construction and demolition waste (C&DW) in construction, as alternative to virgin (natural) aggregates, has strong potential. The use of RCA preserves natural resources and reduces the space required for the disposal of RCA in landfill. It is estimated that 16 thousand million (billion) tons of concrete (and 25 billion tons of aggregate) were used in 2010. Of the 2-3 billion tons of C&DW which are produced worldwide every year, South Africa contributes 5-8 million tons. This amount is increasing rapidly every year. Significant amounts of demolished concrete find their way to landfill sites. A solution for excess waste production would be the utilization of RCA together with an improvement in the final quality of RCA. It might be an important breakthrough for our society in our attempt towards sustainable development. Worldwide, infrastructure has developed a great deal since the beginning of the twentieth century. Much of the core infrastructure, including roads, bridges, water systems, and sewers, was put in place during the first half of that century. Aggregates used as construction materials, as for instance in road pavements, or as an ingredient of concrete, are important components of infrastructure. Urbanization involves reduction of natural aggregate (NA) resources, but environmental concern and the rising cost of NA is the reason that recycled materials from different sources (like roads, buildings) are being used more and more with NA in new construction work. Environmental awareness is increasing in every country for many reasons and sustainable development is demanded of all industries, including the building and construction industries. By nature, construction is not environmentally friendly, and sometimes it also changes the behavior of nature in many ways. Recycling is one of the most important ways to minimize the waste that comes from different sources, thereby avoiding repetition of, and additional environmentally hazardous practices. It may create new wealth by diminished transport and production costs and sparing of landfill site space and cost. It has the potential to extend the life of natural resources by adding a source of material, thereby reducing environmental interference and impacting on nearby construction sites, all of which improve sustainability of our natural resources. Much research on the uses of RCA has been performed during the last few decades. In fact, most of them showed that the strength class of recycled aggregate concrete (RAC) is adequate for use as structural concrete although volume changes in and durability performance of RAC in comparison with natural aggregate concrete (NAC) are still being debated and researched. Some researchers found that the durability of concrete produced with RCA is inferior, but others have found it to be sufficient for use in structural concrete. The fact that an insufficient number of studies have been carried out on the durability aspects, has limited the use of RCA as material for road construction. The aim of this study is to determine the suitability of using the RCA in structural concrete based on its strength, stiffness, dimensional stability and durability. Three types of RCA designated RCA1, RCA2 and RCA3 in this study, were taken from three different sources. These materials were tested to establish their mechanical characteristics for use as aggregates in concrete. In the experimental program RCA was used at replacement percentages of 0%, 30% and 100% to (partially) replace NA in order to study its suitability as aggregate in concrete, and to what level of NA replacement its behavior is satisfactory for structural application. A single compressive strength class was studied, due to the limited time. By performing tests of compressive strength, Young’s modulus, creep, shrinkage, and durability performance, it has been found that selected types of RCA show a real possibility for use as aggregate in concrete. When concrete with a RCA replacement of 100% was compared with NAC100% there was a small decline in strength, but when concrete with a RCA replacement of 30% was compared with NAC100% the results showed almost equal strength. A slight reduction in durability performance was found for RAC30% compared with NAC100%, but similar dimensional stability performance in terms of specific creep and drying shrinkage was measured for RAC30% and NAC100%. Based on detailed experimental results obtained from this thesis project, a number of recommendations have therefore been made for RCA characteristics that will be used in concrete mixes also taking into account the quality of RCA. Some suggestions are proposed based on the mechanical properties and durability of the concrete. In the final conclusions, future studies on RCA properties are suggested, which would help us in increasing our knowledge in the application of RCA, and which may lead to the optimal production of structural concrete in a sustainable way. In general the use of RCA in concrete is feasible and good quality RCA at 30% replacement of NA may be suitable for any kind of structural concrete. / AFRIKAANSE OPSOMMING: ‘n Groot uitdaging vir ons samelewing is die beskerming van die omgewing. Van die belangrike sake is die vermindering in die verbruik van energie en van natuurlike, onverwerkte materiale asook die groter verbruik van afvalmateriaal. Hierdie onderwerpe kry tans aanienlike aandag as deel van volhoubare ontwikkelingsprogramme. Die gebruik van betonaggregate, herwin vanaf konstruksie-en slopingsafval, en gebruik in konstruksie as alternatief vir ongebruikte natuurlike aggregate, het goeie potensiaal. Die gebruik van herwonne aggregaat beskerm natuurlike hulpbronne en verminder die oppervlakte en volume wat nodig is vir die weggooi daarvan op stortingsterreine. Dit is beraam dat 16 duisend miljoen (biljoen) ton beton (en ongeveer 25 biljoen ton aggregaat) gedurende 2010 gebruik is. Van die 2-3 biljoen ton konstruksie-en slopingsafval wat jaarliks wêreldwyd gegenereer word, dra Suid Afrika 5-8 miljoen ton by. Hierdie hoeveelheid word elke jaar vinnig meer. Beduidende hoeveelhede gesloopte beton beland elke jaar op stortingsterreine. ‘n Oplossing vir die probleem van te veel atval generering sou wees die gebruik daarvan as herwonne beton-aggregaat, sou saamval met ‘n verbetering in die uiteindelike kwaliteit van herwonne aggregaat beton. Dit kan dalk ‘n belangrike deurbraak wees vir ons samelewing in ons strewe na volhoubare ontwikkeling. Infrastruktuur het wêreldwyd baie ontwikkel sedert die begin van die twintigste eeu. Baie van die kerninfrastruktuur insluitende paaie, brue, waterstelsels en riole is gebou tydens die eerste helfte van daardie eeu. Aggregaat gebruik as konstruksiemateriaal, byvoorbeeld in padplaveisels of as’n bestanddeel van beton, is ‘n belangrike deel van infrastruktuur. Verstedeliking veroorsaak vermindering van natuurlike aggregaat hulpbronne maar besorgdheid oor die omgewing en die stygende koste van nataurlike aggregaat veroorsaak dat herwonne materiale vanaf verskillende bronne (soos paaie en geboue) meer en meer aanvullend tot natuurlike aggregaat in nuwe konstruksiewerke gebruik word. Omgewingsbewustheid is om baie redes aan die toeneem in elke land en volhoubare ontwikkeling word vereis van alle industrieë. Herwinning is een van die hoofmaniere om afval vanaf verskillende bronne tot ‘n minimum te beperk. Dit skep nuwe rykdom, verminder vervoeren vervaardigingskoste en benut afval wat anders op stortingsterreine verlore sou gegaan het. Dit het die potensiaal om die lewensduur van natuurlike hulpbronne te verleng deur ‘n materiaalbron by te voeg, deur inmenging in die omgewing te verminder, wat almal bevorderlik is om volhoubare benutting van ons hulpbronne te verbeter. Baie navorsing is gedurende die laaste paar dekades gedoen aangaande die gebruik van herwonne aggregaat. Die meeste van die navorsing het inderdaad getoon dat die sterkte van beton met herwonne aggregaat genoegsaam is vir gebruik as struktuurbeton alhoewel daar wel debatte gevoer word oor die volumeveranderings en duursaamheid prestasie van herwonne aggregaat beton vergeleke met dié van natuurlike aggregaat beton. Sommige navorsers het bevind dat die duursaamheid van beton wat met herwonne aggregaat gemaak is, minderwaardig is maar andere het bevind dat dit voldoen aan die vereistes van struktuurbeton. Slegs die feit dat daar onvoldoende toetse rakende duursaamheid gedoen is, het die gebruik van herwonne beton aggregaat beperk tot padboumateriaal. Die doel van hierdie navorsing is om te bepaal wat die geskiktheid van herwonne betonaggregaat is vir gebruik in struktuurbeton, gegrond op sterkte en duursaamheid. Drie soorte herwonne betonaggregaat wat in hierdie studie as RCA1, RCA2 and RCA3 aangedui word, is elk vanaf ‘n ander bron geneem. Hierdie materiale is getoets om hulle meganiese kenmerke vas te stel vir gebruik as aggregaat in beton. In die eksperimentele program is 0%, 30% en 100% herwonne betonaggregaat gebruik om natuurlike aggregaat gedeeltelik be vervang om sodoende die geskiktheid as betonaggregaat te bestudeer. Deur toetse uit te voer op ‘n beperkte sterkte-klas beton, soos toetse vir die bepaling van druksterkte, Young’s modulus, kruip, krimp en duursaamheid, is daar bevind dat sekere soorte herwonne betonaggregaat heel moontlik gebruik kan word in struktuurbeton. Toe beton met 100% herwonne betonaggregaat vergelyk is met beton met 100% natuurlike aggregaat, is bevind dat daar ‘n klein vermindering in sterkte was, maar waar beton met 30% herwonne betonaggregaat vergelyk is met beton met 100% natuurlike aggregaat, het die resultate byna dieselfde sterkte getoon. Dus op grond van gedetaileerde eksperimentele resultate is ‘n aantal aanbevelings gemaak vir kenmerke van herwonne betonaggregaat wat in betonmengsels gebruik sal word met inagneming van die gehalte van herwonne betonaggregaat. Die resultate vir beton met 30% en 100% herwonne betonaggregaat word vergelyk met beton wat slegs natuurlike aggregaat bevat. Sekere voorstelle gegrond op meganiese eienskappe en duursaamheid van die beton word gemaak, asook aanbevelings vir toekomstige studies van herwonne betonaggregaat wat ons sal help om ons kennis vir die toepassing van herwonne betonaggregaat uit te brei.

The diploma thesis deals with the issue of waterproof concrete and testing its properties. The theoretical part is conceived through research on existing knowledge relating to waterproof concrete. Emphasis is placed on the possibility of using a waterproof concrete for structures, such is e.g. tunnel lining. The experimental part is focused on the laboratory testing of waterproof concrete. Particulary examined was the effect of various admixtures as a partial replacement of cement. Monitored was the development of compressive strength and flexural strength, development of temperature during hydration in the early stages of maturation of concrete, water resistance of concrete, concrete surface resistance to water and chemical de-icing agents, as well as development of shrinkage during concrete maturation.

Secondary energy products are used in the construction industry for a long time. More strict environmental limits for emissions to air have created new technologies combustion of materials in thermal power plants. In this way combustion are produced a new secondary energy products. It is an attempt to find of suitable use for these products. Their use will have ecological impact on the environment and it will allow prepare of new compositions of higher utility properties. The aim of this study was to develop a new mixture, using the new secondary energy products, for production concrete with high utility properties.

This thesis deals with the study of cement – concrete coverings. The aim of the thesis is a summary of current knowledge of these constructions. The experimental part of this paper deals with the design of concrete for the lower layer of cement – concrete cover. Emphasis is placed on the elimination of microcracks and to increase the lifetime of these construction.

2022 fanden die 9. Jahrestagung des Deutschen Ausschusses für Stahlbeton (DAfStb) sowie das 61. DAfStb-Forschungskolloquium am 26. und 27. September in Dresden direkt im Vorfeld der 14. Carbon- und Textilbetontage statt. Gastgeber waren die Institute für Baustoffe (IfB) und Massivbau (IMB) der Technischen Universität Dresden. Thematische Schwerpunkte waren Impaktbelastungen, Ingenieurbau, Ermüdung und Dauerhaftigkeit, Frischbeton und Rheologie, additive Fertigung und Sensorik sowie Carbonbeton. Der vorliegende Tagungsband enthält alle Beiträge in deutscher oder englischer Sprache.:Themenschwerpunkt Impakt Cesare Signorini, Viktor Mechtcherine: Mineral-bonded composites for enhanced structural impact safety: The vision of the DFG GRK 2250 Ahmed Tawfik, Viktor Mechtcherine: On the shear behavior of mineral-bonded composites under impact loading Lena Leicht: Charakterisierung von mineralisch gebundenen Kompositen zur Impaktdämpfung Franz Bracklow: Rückseitige Verstärkung von Stahlbetonplatten unter Impaktbeanspruchung Themenschwerpunkt Ingenieurbau Steffen Marx: Ingenieurbau im Bestand Conrad Pelka: Sanierung von Gewölbebrücken Max Herbers: Langzeitverformung semi-integraler Talbrücken – Messung und Simulation Fabian Klein: Modellierung der Torsionstragfähigkeit segmentierter Betontürme auf Basis der Wölbtheorie dünnwandiger Stäbe Jan-Hauke Bartels: Robuste, lebensdauerumfassende Monitoringkonzepte für Offshore-Windenergieanlagen Themenschwerpunkt Ermüdung und Dauerhaftigkeit Dominik Junger, Viktor Mechtcherine: Ermüdungsverhalten von hochduktilem Kurzfaserbeton Raúl Beltrán: Untersuchung von ermüdungsbedingten Veränderungen der Ultraschallgeschwindigkeit in Beton Marc Koschemann: Rissbreitenentwicklung unter Langzeitbelastung anhand lokaler Verbundbeziehungen Daniel Gebauer: Rissbildung und Rissbreitenentwicklung bei Stahlbetonbauteilen unter verformungsinduziertem Zwang Michaela Reichardt, Steffen Müller, Viktor Mechtcherine: Erhöhung der Dauerhaftigkeit von Wasserbauwerken durch faserbewehrte, zementgebundene Komposite Themenschwerpunkt Frischbeton und Rheologie Rolf Breitenbücher, Udo Wiens, Mirsada Omercic: Wandel im Betonbau – Aktuelle Herausforderungen Daniil Mikhalev, Viktor Mechtcherine, Dario Cotardo, Michael Haist: Pumpverhalten und Blockierungsneigung von Beton: Erkenntnisse aus Großversuchen Irina Ivanova, Silvia Reißig, Viktor Mechtcherine: Vergleich von Bewertungsmethoden für die rheologischen Eigenschaften von frisch gedrucktem Beton Slava Markin, Viktor Mechtcherine: Rissbildung in 3D-gedruckten Betonelementen infolge plastischen Schwindens: Ursachen und Quantifizierungsmethoden Steffen Müller, Viktor Mechtcherine: Alternative mineralische Baustoffe – Potentiale und Eigenschaften Themenschwerpunkt Additive Fertigung und Sensorik Viktor Mechtcherine: Additive Fertigung mit Beton Tobias Neef, Viktor Mechtcherine: Additiv gefertigter Carbonbeton mit mineralischer Tränkung der Garne Egor Ivaniuk, Viktor Mechtcherine: Formwork-free, continuous production of variable frame elements for modular shell structures Markus Taubert, Viktor Mechtcherine: 3D-druckbarer Normalbeton mit grober Gesteinskörnung Sebastian Hegler, Marco Liebscher, Viktor Mechtcherine, Dirk Plettemeier: Rissdetektion und -lokalisierung in Betonstrukturen mittels Auswertung elektromagnetischer Hochfrequenzwellen Themenschwerpunkt Carbonbeton Norbert Will: DAfStb-Richtlinie „Betonbauteile mit Nichtmetallischer Bewehrung“ – Von Forschung und Pilotprojekten zum Regelwerk Nazaib Ur Rehman, Harald Michler: Existing codes and guidelines for durability design of FRP reinforcement Peter Betz: Carbonbeton unter Druck – Einfluss von Querdruck und Querzug Enrico Baumgärtel: Untersuchung von Stäben und Gelegen aus rezyklierten Carbonfasern Iurii Vakaliuk: Use of pervading internal shell-type substructures to dissolve compact components / 2022, the 9th Annual Conference of the Deutscher Ausschusses für Stahlbeton (German Committee for Reinforced Concrete, DAfStb) and the 61st DAfStb Research Colloquium took place on 26 and 27 September in Dresden directly in the run-up to the 14th Carbon and Textile Concrete Days. It was hosted by the Institutes for Building Materials (IfB) and Concrete Structures (IMB) of the Technische Universität Dresden. The main topics were impact loads, civil engineering, fatigue and durability, fresh concrete and rheology, additive manufacturing and sensor technology as well as carbon reinforced concrete. The present conference proceedings contain all contributions in German or English.:Themenschwerpunkt Impakt Cesare Signorini, Viktor Mechtcherine: Mineral-bonded composites for enhanced structural impact safety: The vision of the DFG GRK 2250 Ahmed Tawfik, Viktor Mechtcherine: On the shear behavior of mineral-bonded composites under impact loading Lena Leicht: Charakterisierung von mineralisch gebundenen Kompositen zur Impaktdämpfung Franz Bracklow: Rückseitige Verstärkung von Stahlbetonplatten unter Impaktbeanspruchung Themenschwerpunkt Ingenieurbau Steffen Marx: Ingenieurbau im Bestand Conrad Pelka: Sanierung von Gewölbebrücken Max Herbers: Langzeitverformung semi-integraler Talbrücken – Messung und Simulation Fabian Klein: Modellierung der Torsionstragfähigkeit segmentierter Betontürme auf Basis der Wölbtheorie dünnwandiger Stäbe Jan-Hauke Bartels: Robuste, lebensdauerumfassende Monitoringkonzepte für Offshore-Windenergieanlagen Themenschwerpunkt Ermüdung und Dauerhaftigkeit Dominik Junger, Viktor Mechtcherine: Ermüdungsverhalten von hochduktilem Kurzfaserbeton Raúl Beltrán: Untersuchung von ermüdungsbedingten Veränderungen der Ultraschallgeschwindigkeit in Beton Marc Koschemann: Rissbreitenentwicklung unter Langzeitbelastung anhand lokaler Verbundbeziehungen Daniel Gebauer: Rissbildung und Rissbreitenentwicklung bei Stahlbetonbauteilen unter verformungsinduziertem Zwang Michaela Reichardt, Steffen Müller, Viktor Mechtcherine: Erhöhung der Dauerhaftigkeit von Wasserbauwerken durch faserbewehrte, zementgebundene Komposite Themenschwerpunkt Frischbeton und Rheologie Rolf Breitenbücher, Udo Wiens, Mirsada Omercic: Wandel im Betonbau – Aktuelle Herausforderungen Daniil Mikhalev, Viktor Mechtcherine, Dario Cotardo, Michael Haist: Pumpverhalten und Blockierungsneigung von Beton: Erkenntnisse aus Großversuchen Irina Ivanova, Silvia Reißig, Viktor Mechtcherine: Vergleich von Bewertungsmethoden für die rheologischen Eigenschaften von frisch gedrucktem Beton Slava Markin, Viktor Mechtcherine: Rissbildung in 3D-gedruckten Betonelementen infolge plastischen Schwindens: Ursachen und Quantifizierungsmethoden Steffen Müller, Viktor Mechtcherine: Alternative mineralische Baustoffe – Potentiale und Eigenschaften Themenschwerpunkt Additive Fertigung und Sensorik Viktor Mechtcherine: Additive Fertigung mit Beton Tobias Neef, Viktor Mechtcherine: Additiv gefertigter Carbonbeton mit mineralischer Tränkung der Garne Egor Ivaniuk, Viktor Mechtcherine: Formwork-free, continuous production of variable frame elements for modular shell structures Markus Taubert, Viktor Mechtcherine: 3D-druckbarer Normalbeton mit grober Gesteinskörnung Sebastian Hegler, Marco Liebscher, Viktor Mechtcherine, Dirk Plettemeier: Rissdetektion und -lokalisierung in Betonstrukturen mittels Auswertung elektromagnetischer Hochfrequenzwellen Themenschwerpunkt Carbonbeton Norbert Will: DAfStb-Richtlinie „Betonbauteile mit Nichtmetallischer Bewehrung“ – Von Forschung und Pilotprojekten zum Regelwerk Nazaib Ur Rehman, Harald Michler: Existing codes and guidelines for durability design of FRP reinforcement Peter Betz: Carbonbeton unter Druck – Einfluss von Querdruck und Querzug Enrico Baumgärtel: Untersuchung von Stäben und Gelegen aus rezyklierten Carbonfasern Iurii Vakaliuk: Use of pervading internal shell-type substructures to dissolve compact components