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Advanced Chemical And Creep Modeling For Alkali Aggregate Reaction In Concrete
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Book Synopsis Advanced Chemical and Creep Modeling for Alkali-Aggregate Reaction in Concrete by : Fernando A. N. Silva
Download or read book Advanced Chemical and Creep Modeling for Alkali-Aggregate Reaction in Concrete written by Fernando A. N. Silva and published by Springer Nature. This book was released on with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alkali-Aggregate Reaction in Concrete by : Ian Sims
Download or read book Alkali-Aggregate Reaction in Concrete written by Ian Sims and published by CRC Press. This book was released on 2017-08-01 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkali-Aggregate Reaction in Concrete: A World Review is unique in providing authoritative and up to date expert information on the causes and effects of Alkali-Aggregate Reaction (AAR) in concrete structures worldwide. In 1992 a first edition entitled The Alkali-Silica Reaction in Concrete, edited by Professor Narayan Swamy, was published in a first attempt to cover this concrete problem from a global perspective, but the coverage was incomplete. This completely new edition offers a fully updated and more universal coverage of the world situation concerning AAR and includes a wealth of new evidence and research information that has accumulated in the intervening years. Although there are various textbooks offering readers sections that deal with AAR deterioration and damage to concrete, no other single book brings together the views of recognised international experts in the field, and the wealth of scattered research information that is available. It provides a ‘state of the art’ review and deals authoritatively with the mechanisms of AAR, its diagnosis and how to treat concrete affected by AAR. It is illustrated by numerous actual examples from around the world, and comprises specialist contributions provided by senior engineers and scientists from many parts of the world. The book is divided into two distinct but complementary parts. The first five chapters deal with the most recent findings concerning the mechanisms involved in the reaction, methods concerning its diagnosis, testing and evaluation, together with an appraisal of current methods used in its avoidance and in the remediation of affected concrete structures. The second part is divided into eleven chapters covering each region of the world in turn. These chapters have been written by experts with specialist knowledge of AAR in the countries involved and include an authoritative appraisal of the problem and its solution as it affects concrete structures in the region. Such an authoritative compilation of information on AAR has not been attempted previously on this scale and this work is therefore an essential source for practising and research civil engineers, consultant engineers and materials scientists, as well as aggregate and cement producers, designers and concrete suppliers, especially regarding projects outside their own region.
Book Synopsis Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete by : Leandro F. M. Sanchez
Download or read book Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete written by Leandro F. M. Sanchez and published by Springer Nature. This book was released on with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Alkali-Silica Reaction in Concrete by : R N Swamy
Download or read book The Alkali-Silica Reaction in Concrete written by R N Swamy and published by CRC Press. This book was released on 1991-09-01 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the fundamental causes and spectrum effects of ASR. It considers he advances that have been made in our understanding of this problem throughout the world.
Book Synopsis Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete by : Leandro F. M. Sanchez
Download or read book Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete written by Leandro F. M. Sanchez and published by Springer Nature. This book was released on with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemistry of Cement written by and published by . This book was released on 1962 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Alkali-Aggregate Reaction in Concrete by :
Download or read book The Alkali-Aggregate Reaction in Concrete written by and published by . This book was released on 1958 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shrinkage and Creep of Alkali-activated Slag Concrete by : Richard Caron
Download or read book Shrinkage and Creep of Alkali-activated Slag Concrete written by Richard Caron and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Concrete Technology by : Zongjin Li
Download or read book Advanced Concrete Technology written by Zongjin Li and published by John Wiley & Sons. This book was released on 2022-08-17 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Concrete Technology A thorough grounding in the science of concrete combined with the latest developments in the rapidly evolving field of concrete technology In the newly revised second edition of Advanced Concrete Technology, a distinguished team of academics and engineers delivers a state-of-the-art exploration of modern and advanced concrete technologies developed during the last decade. The book combines the essential concepts and theory of concrete with practical examples of material design, composition, processing, characterization, properties, and performance. The authors explain, in detail, the hardware and software of concrete, and offer readers discussions of the most recent advances in concrete technology, including, but not limited to, concrete recycling, nanotechnology, microstructural simulation, additive manufacturing, and non-destructive testing methods. This newest edition of Advanced Concrete Technology provides a sustained emphasis on sustainable and novel technologies, like new binders, 3D printing, and other advanced materials and techniques. Readers will also find: A thorough introduction to concrete, including its definition and its historical evolution as a material used in engineering and construction In-depth explorations of the materials for making concrete and the properties of fresh concrete Comprehensive discussions of the material structure of concrete, hardened concrete, and advanced cementitious composites Fulsome treatments of concrete fracture mechanics, non-destructive testing in concrete engineering, and future trends in concrete Perfect for undergraduate and graduate students studying civil or materials engineering—especially those taking classes in the properties of concrete or concrete technologies—as well as engineers in the concrete industry. Advanced Concrete Technology, 2nd Edition will also earn a place in the libraries of civil and materials engineers working in the industry.
Book Synopsis Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete by : Leandro F.M. Sanchez
Download or read book Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete written by Leandro F.M. Sanchez and published by Springer. This book was released on 2024-06-07 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the peer-reviewed papers presented at the 17th International Conference on Alkali-Aggregate Reaction in Concrete (ICAAR), held in Ottawa, Ontario, Canada, on May 19-24, 2024. It highlights the latest advances and innovations in the field of internal swelling reactions, particularly alkali-aggregate reaction (AAR), and combined mechanisms such as delayed ettringite formation (DEF). The conference topics encompass understanding the reaction mechanisms and the affecting factors; testing methods and preventative measures; diagnosis, evaluation, and prognosis; monitoring and NDT; structural effects and modeling at all scales; repair and remedial measures; and combined mechanisms (e.g., DEF). The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations.
Book Synopsis The Effects of Alkali-aggregate Reactivity on the Mechanical Properties of Concrete by : Sheldon Langdon
Download or read book The Effects of Alkali-aggregate Reactivity on the Mechanical Properties of Concrete written by Sheldon Langdon and published by . This book was released on 1998 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NBS Monograph by : United States. National Bureau of Standards
Download or read book NBS Monograph written by United States. National Bureau of Standards and published by . This book was released on 1962 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diagnosis and Control of Alkali-aggregate Reactions in Concrete by : James A. Farny
Download or read book Diagnosis and Control of Alkali-aggregate Reactions in Concrete written by James A. Farny and published by . This book was released on 1997 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregates containing certain constituents can react with alkali hydroxides in concrete. The reactivity is potentially harmful only when it produces significant expansion. This alkali-aggregate reactivity (AAR) has two forms--alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR, sometimes called alkali-carbonate rock reaction, or ACRR). ASR is of more concern than ACR because the occurrence of aggregates containing reactive silica minerals is more common. Alkali-reactive carbonate aggregates have a specific composition that is not very common. Alkali-silica reactivity has been recognized as a potential source of distress in concrete since the later 1930s. Even though potentially reactive aggregates exist throughout North America, ASR distress in structural concrete is not common. There are a number of reasons for this: 1. Most aggregates are chemically stable in hydraulic-cement concrete 2. Aggregates with good service records are abundant in many areas 3. The concrete in service is dry enough to inhibit ASR 4. The use of certain pozzolans or slags controls ASR 5. In many concrete mixtures, the alkali content of the concrete is low enough to control harmful ASR 6. Some forms of ASR do not produce significant deleterious expansion To reduce ASR potential requires understanding the ASR mechanism; properly using tests to identify potentially reactive aggregates; and, if needed, taking steps to minimize the potential for expansion and related cracking. Alkali-carbonate reaction in concrete was not documented until 1957. Although ACR is much less common, this report also briefly reviews the mechanism, visual distress symptoms, identification tests, and control measures.
Author :National Research Council (U.S.). Highway Research Board. Committee on Durability of Concrete Chemical Aspects Publisher : ISBN 13 : Total Pages : pages Book Rating :4.:/5 (59 download)
Book Synopsis The Alkali-aggregate Reaction in Concrete by : National Research Council (U.S.). Highway Research Board. Committee on Durability of Concrete Chemical Aspects
Download or read book The Alkali-aggregate Reaction in Concrete written by National Research Council (U.S.). Highway Research Board. Committee on Durability of Concrete Chemical Aspects and published by . This book was released on 1958 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructural Characterization and Modeling of Concrete Damaged by Alkali-Silica Reaction (ASR) by : Chi Zhang
Download or read book Microstructural Characterization and Modeling of Concrete Damaged by Alkali-Silica Reaction (ASR) written by Chi Zhang and published by . This book was released on 2017 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alkali-Silica Reaction (ASR) is one main detrimental factor to affect the durability of concrete. The research comprises two parts, i.e. microstructural characterization of ASR products (3 phases), and modeling of concrete damage due to ASR. The experimental results will provide new findings on the microstructure properties of ASR-damaged concrete. The work in the first phase of the research aims at characterizing the micromechanical properties of ASR products by new techniques of nanoindentation and micro-indentation, with emphasis on their viscous behavior. The concrete samples were extracted from a heavily ASR-affected concrete pavement in Bécancour (Québec). The concrete is characterized by numerous fine-grained limestone aggregate particles with microcracks filled with secondary reaction products that extend into the cement into a network from one aggregate particle to another. After careful sample preparation (polishing), the surface of the aggregate particle and of the veinlets (i.e. cracks filled with crystalline ASR product within the aggregate particles) was examined by Atomic Force Microscopy (AFM) before nanoindentation testing. Both nanoscale and microscale indentation modulus and hardness of ASR products were measured. The test results show that ASR crystalline products exhibit important relaxation behavior of about 40%. Then, a simplified rheological model was proposed to fit the load relaxation curves and their asymptotic values. These results suggest that ASR product relaxation is significant and mostly irreversible. The second research phase explored the use of the novel micro-scratch technique to characterize the fracture energy (i.e., toughness) of the ASR-affected limestone aggregate particles within a core specimen extracted from a heavily ASR-affected concrete bridge from the Québec City area. The ASR-affected aggregate particles were typically showing "zoning" (i.e. light grey and dark grey) surrounding white veinlets within reacted limestone aggregate particles. As a reference, an undamaged/virgin quarried limestone specimen from a local quarry was selected and subjected to similar testing. Besides the elastic properties, the toughness of the reactive aggregate particles was statistically measured to be around 1.5 MPam1/2. The fracture toughness of reactive aggregate particles was affected neither by the bedding line directions nor by the "zoning" that was first thought to correspond to "reacted" portions of the particles. Besides the major cracks filled by ASR products, the results indicated that the surrounding reactive aggregate was not characterized by any significant internal damage distribution. In the later phase of the experimental program, our research focused on characterizing the creep and stress relaxation properties of the ASR crystalline products typically filling microcracks within reactive limestone particles (specimen from the heavily ASR-affected concrete pavements in Bécancour (Québec) used in phase 1). The testing carried out was micro-indentation under controlled relative humidity. It was found that an increase in relative humidity strongly reduces the irreversible creep deformation of ASR crystalline products, which act a greater characteristic time. That is, the water content seems to favor irreversible sliding mechanisms along/between the ASR crystals under constant load. Finally, the implications the research findings are discussed with respect to the stress build-up process within reactive aggregate particles. The rheological property of ASR products may play a critical role to releasing the internal stress induced by the ASR product expansion. Finally, a "1D thought model" is proposed as a new research avenue to account for the major results of this work into ASR-damaged concrete modeling, i.e., the visco-elastic property of ASR products and the damage toughness of reactive aggregates.
Book Synopsis Alkali-silica Reaction Mechanisms and Detection by :
Download or read book Alkali-silica Reaction Mechanisms and Detection written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deterioration caused by alkali-silica reaction (ASR) was first described 70 years ago in the pioneering paper by Stanton and has since been extensively researched. The traditional attempts to mitigate ASR in concrete structures focused on preventing and/or reducing the amount of gel formed by modifying the chemical environment. Limiting the alkali content of concrete, using supplementary cementitious materials, or using chemical admixtures all have been found to be effective and have been extensively used for that purpose. However, the complexity of chemical and mechanical mechanisms of ASR made it difficult to develop reliable quality control test methods and performance prediction models. Therefore, increased understanding of the fundamental mechanisms of ASR may lead to the development of additional (and possibly better) options for ASR control and for reactivity characterization of susceptible aggregates. The main purpose of this research was to investigate the fundamental mechanisms involved in the ASR process and to advance approaches to detect the damage caused by ASR. A more indepth understanding of the mechanisms underlying ASR, combined with the methods to detect ASR damage developed in the course of this study, is expected to help establish more reliable methods of mitigating ASR and increasing the design life of newly constructed concrete structures.
Book Synopsis Understanding Mesoscopic Chemo-mechanical Distress and Mitigation Mechanisms of Concrete Subject to ASR by : Md Asif Rahman
Download or read book Understanding Mesoscopic Chemo-mechanical Distress and Mitigation Mechanisms of Concrete Subject to ASR written by Md Asif Rahman and published by . This book was released on 2020 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Alkali-silica reaction (ASR) is one of the common sources of concrete damage worldwide. The surrounding environment, namely, temperature and humidity greatly influence the alkali-silica reaction induced expansion. Global warming (GW) has caused frequent change in the climate and initiated extreme weather events in recent years. These extreme events anticipate random change in temperature and humidity, and convey potential threats to the concrete infrastructure. Moreover, external loading conditions also affect the service life of concrete. Thus, complex mechanisms of ASR under the impact of seasonal change and global warming require a precise quantitative assessment to guide the durable infrastructure materials design practices. Despite decades of phenological observation study, the expansion behavior of ASR under these situations remains to be understood for capturing the ASR damage properly. Within this context this research focuses on the mathematical model development to quantify and mitigate ASR-induced damage. Mesoscale characteristics of ASR concrete was captured in the virtual cement-concrete lab where the ASR gel-induced expansion zone was added as a uniform thickness shell. Finite element method (FEM) was used to solve the ASR formation and expansion evolution. The results of this study are presented in the form of one conference and their journal manuscripts. The first manuscript focuses on the development of the governing equations based on the chemical formulas of alkali-silica reaction to account for the ASR kinetics and swelling pressure exerted by the ASR expansion. There is a fluid flow and mass transfer in the concrete domain due to ASR gel associated from ASR kinetics. This paper involves derivation of the mass and momentum balance equation in terms of the thermo-hygro-mechanical (THM) model. THM model accounts for thermal expansion and hygroscopic swelling in addition to traffic loads to represent volumetric change in the concrete domain. The second manuscript is a case study based on different cement-aggregate proportions and alkali hydroxide concentrations. It is important to know how ASR evolves under variable concentration of the chemical species. The simulated results show that high concentration of hydroxide ion in concrete initiates more reaction and damage in concrete. Also chemical reaction moves to the right direction with low cement to aggregate ratio which means ASR expansion depends on the availability of the reactive aggregates in the concrete domain. The third manuscript attempts to develop a simplified ASR model that integrates chemo-physio-mechanical damage under stochastic weather impact. Stochasicity incorporates the random behavior of surrounding nature in the model. The simulated results elucidate that ASR expansion is more severe under the influence of global warming and climate change. This will support long-term damage forecasts of concrete subjected to extreme weather events. The fourth manuscript focuses on the quantification of mechanical damage under ASR expansion and a dedicated mitigation scheme to minimize it. Added creep loads and physics identify the role of creep damage on ASR expansion. The results from this paper confirms that the ASR-induced damage significantly minimize the load carrying capacity of concrete. It directly affects the compressive strength, tensile strength, and modulus of elasticity of concrete. Damage in aggregates domain is more than the mortar phase under the creep loadings. Among many supplementary materials, fly ash is the most effective in minimizing ASR expansion and damage. This work also includes a petrographic comparison between different mineral types collected from different locations to identify the reactivity of certain aggregates. Thus, the final outcome of this research is a complete model which is a conclusive solution to the long-term ASR damage prediction. The validated model provides better understanding of ASR kinetics from mesoscale perspective. The developed model can potentially accelerate the precise prediction of concrete service life and mitigation schemes as well as can be used as an alternative scope to the costly laboratory tests methods."--Boise State University ScholarWorks.
