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The Effect Of Lightweight Fine Aggregate On Alkali Silica Reaction And Delayed Ettringite Formation
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Book Synopsis The Effect of Lightweight Fine Aggregate on Alkali-silica Reaction and Delayed Ettringite Formation by :
Download or read book The Effect of Lightweight Fine Aggregate on Alkali-silica Reaction and Delayed Ettringite Formation written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Lightweight Fine Aggregate on Alkali-silica Reaction and Delayed Ettringite Formation by :
Download or read book The Effect of Lightweight Fine Aggregate on Alkali-silica Reaction and Delayed Ettringite Formation written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comprehensive Mechanistic Study on Using Fine Lightweight Aggregate to Mitigate Alkali-silica Reaction by : Chang Li
Download or read book A Comprehensive Mechanistic Study on Using Fine Lightweight Aggregate to Mitigate Alkali-silica Reaction written by Chang Li and published by . This book was released on 2016 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous research has shown that using fine lightweight aggregate (FLWA) can be a promising strategy to mitigate alkali-silica reaction (ASR) in mortar and concrete. While several possible theories were proposed by researchers, discrepancies in testing methods, materials, and supporting evidence still exist. Therefore, this study was initiated. There are two primary focuses: (1) use current ASTM standards to evaluate the efficacy of ASR mitigation when FLWAs were used; (2) elucidate mechanisms by which FLWAs may mitigate ASR. This study assessed the efficacy of ASR mitigation when expanded clay, shale, and slate were used. ASTM test methods including ASTM C289, ASTM C1260 and ASTM C1293 were completed. The fine normal weight aggregates were replaced by the FLWAs at 25% and 50% by volume in concrete mixtures, and 25%, 50% and 100% by volume in mortar mixtures. Results showed that ASTM C1260 and ASTM C1293 can be used to evaluate the mitigation efficacy when FLWAs were used. All three FLWAs were effective in reducing the ASR-induced expansion in ASTM C1260 and ASTM C1293, except the mortar mixture with 25% in ASTM C1260. The investigated FLWAs were especially effective for the concrete with a moderate reactive aggregate. For concrete with a highly reactive aggregate or very highly reactive aggregate, other mitigation strategies may need to be combined with FLWAs to effectively mitigate ASR. The pore solution analysis and scanning electron microscopy (SEM) analysis were completed to elucidate how expanded shale, clay, and slate can mitigate ASR. A reduction in alkalinity was observed when FLWA was incorporated, especially for expanded shale and expanded clay. A high aluminum content was also found in the pore solution of the concrete mixtures with 50% expanded shale and clay through the pore solution analysis. SEM analysis revealed that infilling reaction products formed in the pores of the FLWAs. From energy-dispersive X-ray (EDX) analysis, the chemical composition of the infilling reaction product was found to be close to C-A-S-H, rather than alkali-silica reaction product. The Ca/Si of the reaction product can vary from 0.8~1.1, which is lower than the Ca/Si of ASR reaction product in the paste, but higher than that of the ASR reaction product in aggregates. This finding also indicated that the FLWAs were pozzolanically active. Thermogravimetric analysis (TGA) and simulated pore solution testing were completed to further confirm the potential pozzolanic activity of the expanded shale, clay, and slate of three different sizes: 1.19~2.18 mm, 0.60~0.30 mm, and 0.15~0.30 mm. The reduction of CH and increase of non-evaporable water in the mixtures showed that the expanded shale and clay of 0.15~0.30 mm and 0.30~0.60 mm, as well as the expanded slate of 0.15~0.30 mm, were pozzolanically active. Compared to the reference aggregate, FLWAs showed less dissolved silica content in the simulated pore solution at 38 °C at 84 days. The consumption of Si, Al, Na, and K in the simulated pore solution at 84 days indicated that pozzolanic activity occurred when FLWA is present.
Book Synopsis High-temperature effects on alkali-silica reaction and delayed ettringite formation by : Jorge Miguel Miralles Cardona
Download or read book High-temperature effects on alkali-silica reaction and delayed ettringite formation written by Jorge Miguel Miralles Cardona and published by . This book was released on 2001 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Concrete Structures Affected by Alkali-silica Reaction and Delayed Ettringite Formation by : Paolo Gardoni
Download or read book Evaluation of Concrete Structures Affected by Alkali-silica Reaction and Delayed Ettringite Formation written by Paolo Gardoni and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ettringite written by Bernard Erlin and published by . This book was released on 1999 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alkali-silica Reaction and Delayed Ettringite Formation in Concrete by : Stacy Bauer
Download or read book Alkali-silica Reaction and Delayed Ettringite Formation in Concrete written by Stacy Bauer and published by . This book was released on 2006 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently in Texas, there has been significant damage of field structures resulting from concrete durability problems. Alkali-silica reaction (ASR) and delayed ettringite formation (DEF), or combinations of the two, have been found to be the main causes of these problems. The term Premature Concrete Deterioration (PCD) has been adopted to refer to problems associated with ASR and DEF because it is often difficult to distinguish between them. The Texas Department of Transportation (TxDOT) has designated nine mitigation options that are available to prevent or minimize PCD-related problems. Research is currently underway to document the performance of concrete using these mitigation options in the laboratory and in the field. One of the objectives of this research is to review the state of the art regarding ASR and DEF, with particular attention to mechanisms of damage, appropriate test methods, specifications, and performance-related issues.
Book Synopsis Influence of Fine Aggregate Lithology on Delayed Ettringite Formation in High Early Strength Concrete by : Kenneth L. Williams
Download or read book Influence of Fine Aggregate Lithology on Delayed Ettringite Formation in High Early Strength Concrete written by Kenneth L. Williams and published by . This book was released on 2003 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-destructive Evaluation of In-service Concrete Structures Affected by Alkali-silica Reaction (ASR) Or Delayed Ettringite Formation (DEF) by : Eric R. Giannini
Download or read book Non-destructive Evaluation of In-service Concrete Structures Affected by Alkali-silica Reaction (ASR) Or Delayed Ettringite Formation (DEF) written by Eric R. Giannini and published by . This book was released on 2013 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Master's Theses Directories written by and published by . This book was released on 1999 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Book Synopsis Ettringite Formation and the Performance of Concrete by :
Download or read book Ettringite Formation and the Performance of Concrete written by and published by . This book was released on 2001 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory and field investigations of alkali-silica reaction and its interaction with delayed ettringite formation by : Joseph Donal Hall
Download or read book Laboratory and field investigations of alkali-silica reaction and its interaction with delayed ettringite formation written by Joseph Donal Hall and published by . This book was released on 2003 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Ettringite Formation, the Influence of Aggregate Types, Curing Conditions, Exposure Conditions, Alkali Content, Fly Ash, and Mix Water Conditioner (MWC) by : Amal Azzam
Download or read book Delayed Ettringite Formation, the Influence of Aggregate Types, Curing Conditions, Exposure Conditions, Alkali Content, Fly Ash, and Mix Water Conditioner (MWC) written by Amal Azzam and published by . This book was released on 2002 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory Testing and Investigations of Delayed Ettringite Formation by : Thanos Drimalas
Download or read book Laboratory Testing and Investigations of Delayed Ettringite Formation written by Thanos Drimalas and published by . This book was released on 2004 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delayed ettringite formation (DEF) in concrete structures has recently damaged structures in the state of Texas, which has caused the state to investigate this new type of premature concrete deterioration. The research described in this thesis is part of a comprehensive research project, TxDOT Project 4085. The work described in this thesis focuses primarily on DEF, but also investigates the interplay between DEF and alkali-silica reaction. Significant accelerated laboratory testing was performed, and parallel exposure blocks were cast to evaluate realistic exposure conditions. The research included materials from throughout the state of Texas. The effects of material composition and dosage on DEF were investigated, and several mitigation measures were identified that can prevent DEF-induced expansion, even when concrete is heated above 70 °C. The key findings from this research have been implemented by TxDOT in new state specifications to prevent DEF in prestressed concrete elements.
Book Synopsis Cement and Concrete Chemistry by : Wieslaw Kurdowski
Download or read book Cement and Concrete Chemistry written by Wieslaw Kurdowski and published by Springer Science & Business. This book was released on 2014-04-24 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph describes cement clinker formation. It covers multicomponent systems, clinker phase structures and their reactions with water, hydrate composition and structure, as well as their physical properties. The mineral additions to cement are described as are their influence on cement-paste properties. Special cements are also discussed. The microstructure of concrete is then presented, and special emphasis is given to the role of the interfacial transition zone, and the corrosion processes in the light of cement-phase composition, mineral additions and w/c ratio. The admixtures' role in modern concrete technology is described with an emphasis on superplasticizer chemistry and its cement-paste rheological modification mechanism. Cement with atypical properties, such as calcium aluminate, white, low energy and expansive cements are characterized. The last part of the book is devoted to special types of concrete such as self compacting and to reactive powders.
Book Synopsis Nanotechnology in Construction for Circular Economy by : Wenhui Duan
Download or read book Nanotechnology in Construction for Circular Economy written by Wenhui Duan and published by Springer Nature. This book was released on 2023-07-24 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book covers emerging opportunities and future use of nanotechnology in construction, including deep advances in cement chemistry, nanotechnology, artificial intelligence, robotics, concrete technology, and extreme engineering (blast, impact and fire). The proceedings also presents sectorial interactions within the traditional construction industry supply chain, enabled by the dynamic partnership between international industry, government agencies, and universities. Nanotechnology has transformed the construction materials industry into an advanced manufacturing sector to address climate change and carbon neutrality challenges by delivering sustainable and resilient infrastructure assets. Hence, this book reports specific advances in nanoscience and nano-engineering, and their impacts on numerous novel construction materials including binders, additives, high-performance concrete materials, concrete structural systems, polymer composites, and pavement materials.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2668 pages. Available in PDF, EPUB and Kindle. Book excerpt: