Application of Quarry Dust and Fly Ash in the Concrete …
mitigate alkali-silica reaction, a common problem in concrete that leads to cracking and deterioration. Combining quarry dust and fly ash in concrete can lead to synergistic effects. The pozzolanic reaction of fly ash with calcium hydroxide generated during the hydration of cement contributes to the development
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What Is ASR and How Do I Avoid It?
The alkali part of the reaction comes primarily from the cement in the concrete mix. As a result, ASR occurs at the interface between the cement paste and the surface of aggregate pieces, forming a layer of what is called silica gel. This silica gel will readily absorb water. And when it does, it swells in size.
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Experimental investigation of the effect of fly ash and perlite …
The cement hydration reaction is an exothermic reaction characterised by a rise in temperature within concrete during its setting phase. This is significant in the case of self-compacting concrete (SCC), which has a high cement content and low water–cement ratio. An experimental investigation was undertaken to measure the temperature …
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Alkali-silica reaction (ASR) in concrete structures: …
Alkali-silica reaction (ASR) and its associated deformation are major durability problems in concrete structures and was reported as far back as the 1940s by Stanton (2008) [1]. This deleterious reaction causes excessive expansion and cracks that can lead to severe degradation of the concrete structures. Despite the age-long …
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Potential Alkali Silica Reactivity of various rock types in an
However, in aggregates or mineral addition SCMs such as dredged sediments, two phenomena may take place due to its sand-lime nature: alkali-silica reaction or the alkali carbonates reaction ...
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Alkali-silica reaction in concrete: Mechanisms, mitigation …
Especially prone to alkali-silica reaction (ASR), the expansion of the paste leads to the appearance of cracks and a decrease in porosity. This provides pathways for harmful ions such as chloride ions and sulfate radicals to enter the environment, thereby compromising durability. This review provides better theoretical guidance for improving ...
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Properties, compatibility, environmental benefits and future …
The study conducted by Nguyen et al. [24] evaluated the resistance of LC3 mortar to alkali silica reaction (ASR) through tests on the expansions of mortar bars …
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Alkali-Silica Reactivity Mitigation | SpringerLink
This chapter provides an historical review of the alkali-aggregate reactions (AAR) in concrete which reduce service life of concrete, first recognized in 1940, and the …
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Mechanisms of Alkali-Silica Reaction
Alkali-silica reaction is a chemical phenomenon which can occur in field concrete and is readily reproduced on demand in laboratory investigations. Visible or measurable …
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Quantifying alkali-silica reaction in Pennsylvania | Pit & Quarry
ASR is the chemical reaction between the alkali in the cement, the silica in the aggregate and the presence of water. When ASR occurs in a concentrated concrete product, issues such as cracking, deformation and weakening of joints have been found, thus putting into question the structural integrity and lifespan of roads and bridges.
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Alkali-Silica Reaction
The alkaline solution reacts with amorphous silica to produce a viscous alkali silicate gel. As the reaction proceeds Ca 2+ ions are dissolved into the pore water. These react with the gel to form solid calcium silicate hydrate whereas the alkaline solution converts the remaining siliceous minerals into bulky alkali silicate gel.
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Alkali-silica reaction in concrete: Mechanisms, mitigation and …
The hydration of Portland cement (PC) produces an interstitial concrete pore solution composed mainly of calcium hydroxide (Ca (OH) 2 ), potassium hydroxide …
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Investigation on mechanical behavior of engineered …
Download Citation | Investigation on mechanical behavior of engineered cementitious composites incorporating alkali‐resistant glass fiber and quarry dust | At present, engineered cementitious ...
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Investigation on mechanical behavior of engineered …
Thus, this study recommends utilization of quarry dust to replace fine silica sand in the ECC at amounts ranging from 0% to in order to establish a green, sustainable and cost-effective ECC. The flowability and mechanical demeanor of the ECC mixtures in terms of the tensile, compressive and flexural properties were evaluated.
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ALKALI-SILICA REACTIVITY: AN OVERVIEW OF RESEARCH
alkali-silica reactivity. Alkali-silica reaction gels are composed of two-component mixtures of alkali-calcium-silicate hydrate and alkali-silica sols of nearly fixed compositions. Cracking may be initiated by swelling of aggregate particles before copious production of gel and large expansions of cracks caused by swelling of gel occurs.
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Alkali-aggregate reactivity in Nova Scotia
Alkali-silica reactivity, a reaction between alkalies usually contained in the cement paste and siliceous aggregates, was positively identified in Nova Scotia in 1962.
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Potential alkali silica reactivity of various rock types in an
Generally, alkali–silica reaction (ASR) is considered as an internal chemical reaction between the alkaline components in the cement and active silica–silicate based mineral constituents of some aggregates. The use of aggregates susceptible of ASR in
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Alkali-Silica Reaction: Causes and Solutions
Alkali-silica reactivity, better known as ASR, has been with us since the early 1940s. To lessen ASR problems use low-alkali …
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ALKALI-SILICA REACTIVITY OF SOME GRANITIC ROCKS IN …
Alkali-Silica reactions occur over time between alkaline cement paste and silica contained in rock aggregates as a result of the swelling due to the reaction of certain constituents in the rock ...
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Use of waste glass as sand in mortar: Part II – Alkali–silica reaction
DOI: 10.1016/J.CEMCONCOMP.2012.08.029 Corpus ID: 137143883; Use of waste glass as sand in mortar: Part II – Alkali–silica reaction and mitigation methods @article{Du2013UseOW, title={Use of waste glass as sand in mortar: Part II – Alkali–silica reaction and mitigation methods}, author={Hongjian Du and Kiang Hwee Tan}, …
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The Effects of Bauxite Residue on the Alkali Silica Reaction …
The excess sodium raises a concern to the potential occurrence of the alkali-silica reaction (ASR), a well-documented concrete durability issue shortening the service of structures worldwide. Ribeiro et al. [ 9 ] showed that, despite the high alkali-content, 20% and 30% replacement of PC by BR decrease expansion with respect to 0 and 10% ...
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Properties, compatibility, environmental benefits and future …
Quarry rehabilitation. Durability-Vulnerable to alkali-silica reaction-Limited long-term data-High permeability-May require quality control. Environmental Impact-High energy consumption-Limited research and adoption-Land degradation-Dust and noise pollution. Cost-Fluctuating prices-Initial setup costs may be high-Transportation costs-
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Alkali silica reaction in concrete
Alkali-silica reaction (ASR) is a major cause for concrete deterioration worldwide. However, the mechanism leading to cracking has not been identified yet. In …
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Investigating the Alkali-Silica Reaction of Recycled Glass Aggregates
Application of crushed recycled glass in concrete materials can offer significant economical and environmental benefits provided that the alkali-silica reaction (ASR) of glass in concrete is properly controlled. Previous work on the use of …
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Alkali-Silica Reaction and High Performance Concrete
Damage due to alkali-silica reaction (ASR) in concrete is a phenomenon that was first recognized in 1940 by Stanton [1,2] in North America and has since been observed in many other countries. Many studies [3,4,5] were published since Stanton's first paper, but
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Potential alkali silica reactivity of various rock types in an
1. Introduction. The aggregates which are potential alkali silica reactive may cause a severe degradation of concrete structure due to external environmental factors such as high humidity and sea saline water [1].When concrete is affected by alkali silica reaction (ASR), map like cracks are developed and durability of concrete is reduced …
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Alkali Silica Reaction
Alkali-silica reaction (ASR) is the chemical reaction that occurs between alkali cations and hydroxyl ions in the pore solution of hydrated cement paste and certain reactive silica phases present in the aggregates used in concrete. The product of that reaction, called ASR gel, can expand by imbibing water and thus lead to the expansion and ...
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Rice husk ash as a potential supplementary cementitious material in
After conducting the micro structure analysis, it was reported that the rice husk ash particles constituted for Alkali Silica Reaction (ASR) instead of controlling it. ... (2011) High-strength rice husk ash concrete incorporating quarry dust as a partial substitute for sand. Constr Build Mater 25(7):3123–3130. Article Google Scholar
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Alkali-Silica Reaction (ASR) in Concrete Explained
The reaction process may take years, but once the reaction is underway, the forces from expansion cause cracking to appear on the surface. This blog post will focus on ASR and tests to detect the potential in aggregates and aggregate-mortar mixes. Photo Credit: ASR Identification Handbook The Effect of Alkali-Silica Reaction on Concrete
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Measuring Alkali-Silica Reaction Expansion in Concrete with …
Several degradation mechanisms can affect concrete, and the alkali-silica reaction (ASR) is considered one of the most worrying. ... Rock samples collected from the quarry were subjected to petrographic analysis as per the Brazilian standard NBR 15577–3 using the RILEM ASR Petrographic Atlas as reference.
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