2008
DOI: 10.1016/j.cemconcomp.2007.03.003
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The use of thermodynamic analysis in assessing alkali contribution by alkaline minerals in concrete

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Cited by 18 publications
(14 citation statements)
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“…Goguel [92] showed that in selective leaching tests on rapidly-cooled basalts that contained poorly crystallized feldspars, the alkali release was approximately 1.0% Na 2 O eq of cement mass, whereas a well-crystallized basalt only produced about 0.1% Na 2 O eq of cement mass after leaching. Thermodynamic analysis by Wang and co-workers [101] showed that in alkaline solutions with a pH N 13, the greatest release of alkalis from alkaline minerals in aggregates followed the order of: dawsonite N leucite N nepheline N dehydration analcime N paragonite N muscovite N jadeite N Na-feldspar N K-feldspar. They also showed that a maximum contribution of alkalis was mostly affected by the pore solution/aggregate ratio rather than the level of the pH of the pore solution.…”
Section: Alkali Contribution By Aggregatesmentioning
confidence: 98%
“…Goguel [92] showed that in selective leaching tests on rapidly-cooled basalts that contained poorly crystallized feldspars, the alkali release was approximately 1.0% Na 2 O eq of cement mass, whereas a well-crystallized basalt only produced about 0.1% Na 2 O eq of cement mass after leaching. Thermodynamic analysis by Wang and co-workers [101] showed that in alkaline solutions with a pH N 13, the greatest release of alkalis from alkaline minerals in aggregates followed the order of: dawsonite N leucite N nepheline N dehydration analcime N paragonite N muscovite N jadeite N Na-feldspar N K-feldspar. They also showed that a maximum contribution of alkalis was mostly affected by the pore solution/aggregate ratio rather than the level of the pH of the pore solution.…”
Section: Alkali Contribution By Aggregatesmentioning
confidence: 98%
“…However, AlOH 2+ (aq) and Si 3 O 8 4− are not the final products in the solution, and react in subsequent process to form Al(OH) 4 − and Si(OH) 4 , respectively. H 2 SiO 4 2− is the main form of silicate ions in alkaline solution with pH N 13 (Wang et al, 2008). Hence, the decomposition of K-feldspar in the mixed alkaline solution can be described as: Schemers and Milsch (2013) observed an amorphous phase with sub-μm sized particles forming an altered layer on the feldspar surfaces through HRTEM technique when quartz-feldspar granular aggregates and NaCl aqueous solution were reacted at 150°C, and argued that the altered layer was generated by coupled dissolution-reprecipitation process.…”
Section: The Decomposition Mechanism Of K-feldsparmentioning
confidence: 99%
“…Temperature has an influence on the extraction of alkalis, as concluded by Lu et al [83], which varies with the type of rocks as well as with the fineness of the rock particles and the type of solution. Wang et al [84] report that the factors that influence the maximum alkali release include the types of alkali minerals, the pore solution/aggregate ratio, the pH and the type of alkali ions in pore solution from sources other than the alkaline minerals.…”
Section: 4mentioning
confidence: 99%
“…On the other hand, in a dense paste (low w/cm ratio), transport and ingress of water or solutions, respectively, is reduced as well as the release of alkalis from aggregates [84].…”
Section: Pore Solution Alkalinitymentioning
confidence: 99%