Alkali-aggregate reaction in concrete structures consists of a chemically deleterious reaction between alkalis liberated during the cement hydration and reactive minerals present in the aggregates like silica, silicate or carbonate. The process leads to the formation of a gel, which expands in the ...
Alkali-silica reaction (ASR) can cause serious expansion and cracking in concrete, resulting in major structural problems and sometimes necessitating demolition. This is a short introduction to ASR - for more information, see theUnderstanding Cement book/ebook. Cause of alkali-silica reaction ASR is ...
Alkali-silica reaction of concrete containing glass - Interaction with reactive aggregates. In: 2005 international congress - global construction: ultimate concrete opportunities, July 5, 2005-July 7, 2005, Dundee, Scotland, United Kingdom: Thomas Telford Services Ltd; 2005....
Glass aggregateIn this study, the strength and alkali-silica reaction (ASR) of concrete by incorporating pretreated soda-lime glass particles as fine aggregates were investigated. The glass aggregates were pretreated with three different solutions: Ca(OH)2, NaOH, and a mixture of Ca(OH)2 and ...
Alkali-Silica Reaction (ASR), as a harmful internal reaction in concrete, produces deleterious gel, which occurs due to the reaction between the reactive silica in the aggregate and the alkalis of the pore solution. Because of having hydrophilic groups, imbibes water from surrounding to expand to...
This paper presents a comprehensive review of modeling of alkali-silica reaction (ASR) in concrete. Such modeling is essential for investigating the chemical expansion mechanism and the subsequent influence on the mechanical aspects of the material. The concept of ASR and the mechanism of expansion ...
Alkali silica reaction (ASR) occurs due to chemical reaction between hydroxyl ions in the pore water within the concrete matrix and certain forms of silica. This reaction could lead to strength loss, cracking, volume expansion and potentially failure of the structure. This manuscript reports findings...
Structures affected by Alkali-Silica Reaction (ASR) include large massive concrete dams and bridges, which are considered essential for the infrastructure system, and not easily replaceable. The main feature of this reaction is the creation of a hydrophobic expansive gel which causes internal damage ...
The partial replacement of Portland cement 〈pc〉 by pulverized fuel ash 〈pfa〉 in a series of potentially reactive concretes significantly reduced expansion due to alkali-silica reaction 〈asr〉 in high alkali mixes, whereas, in marginally reactive concretes with lower alkali levels, 25% addition...
Expansive alkali silica gel forms due to the alkali reaction with reactive aggregates. Cracks and damage to the part of the concrete structure are the results of the formation of this expansive gel. There are several ways to minimize this reaction, out of which Lithium Nitrate compound is belie...