Open Access
Microstructure of reaction products --proceedings of the 7th international conference on concrete alkali-aggregate reactions, ottawa, canada, 1986
M Regourd,H Hornain +1 more
TLDR
The major alkali aggregate reaction products include siliceous gels either massive or textured gels and crystals in lamellae or fibers as mentioned in this paper, which give rise to secondary minerals such as hydrocalcite, ettringite and thaumasite.Abstract:
The major alkali aggregate reaction products include siliceous gels either massive or textured gels and crystals in lamellae or fibers. Microstructure of cracked concretes, as observed by light and electron microscopy, shows a weak cement paste -aggregate bond. Elemental analysis by epma or edax of this interface reveals ionic diffusion of alkalies but also of calcium carbonate and sulfate which gives rise to secondary minerals as hydrocalcite, ettringite and thaumasite.(a) for the covering abstract of the conference see IRRD 811982.read more
Citations
More filters
Journal ArticleDOI
Alkali reactivity of mortars containing chert and incorporating moderate-calcium fly ash
TL;DR: In this paper, the results of an experimental program, which aimed to investigate the alkali reactivity of chert and the effect of a moderate-calcium fly ash on the alkyl-silica reaction were reported.
Journal ArticleDOI
Role of granitic aggregates in the deterioration of a concrete dam
TL;DR: A concrete dam was built on the early 1970s in the Douro River about 70 km from the estuary in the Atlantic Ocean, at Porto city, this article, where concrete cores were obtained by drilling and petrographic analysis was performed in order to identify possible products resultant from internal reactions.
Journal ArticleDOI
Calculation of alkali silica reaction (ASR) induced expansion before cracking of concrete
TL;DR: In this article, a calculation method for predicting the formation of alkali-silica gel and analyzing the relationship of ASR induced expansion and aggregate size was proposed, where the complex chemistry of the reaction was simplified to be controlled by the diffusion process of chemical ions into reactive aggregates.
Biomass and Coal Fly Ash in Concrete: Strength, Durability, Microstructure, Quantitative Kinetics of Pozzolanic Reaction and Alkali Silica Reaction Investigations.
TL;DR: Wang et al. as discussed by the authors conducted experiments on several combinations of blended and pure biomass fly ash in concrete mixtures to determine the effects on freshly mixed concrete, strength and durability of hardened concrete, and implication for long-term material properties.
Related Papers (5)
Alkali-aggregate reaction—identifying reactive silicates in complex aggregates by ESEM observation of dissolution features
Andreas Leemann,Lorenz Holzer +1 more