Journal ArticleDOI
Some chemical and physical properties of beltane opal rock and its gelatinous alkali silica reaction product
W.A. Gutteridge,D.W. Hobbs +1 more
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TLDR
In this article, the potentially reactive components of Beltane opal rock are identified as opal-A, opalC and tridymite, and the rate of dissolution of each component in 3 molar sodium hydroxide solution is followed using X-ray powder diffraction.About:
This article is published in Cement and Concrete Research.The article was published on 1980-03-01. It has received 18 citations till now. The article focuses on the topics: Tridymite.read more
Citations
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Alkali-silica reactivity: an overview of research
TL;DR: In this article, a synthesis of knowledge of mechanisms of damage to concrete by alkali-silica reactivity is presented, and the authors identify 10 specific gaps in knowledege of alkali silica reactions in concrete that limit the ability to control these reactions or predict performance of concrete with reactive aggregates.
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Alkali silica and pozzolanic reactions in concrete. Part 1: Interpretation of published results and an hypothesis concerning the mechanism
TL;DR: In this paper, the authors present an hypothesis on the mechanism of alkali silica and pozzolanic reactions in concrete based on the competition mechanism of the kinetics of dissolution of silica, and that of crystallisation of CSH.
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29Si MAS NMR spectroscopic investigation of alkali silica reaction product gels
TL;DR: In this paper, 1.29 Si magic angle spinning NMR spectroscopy and 1 H 29 Si cross-polarization MAS results are reported for gels prepared by reactions of a nevada opal, Beltane opal and cristobalite with KOH in the presence and Ca(OH 2 ).
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The influence of alkali–silica reaction (ASR) gel composition on its hydrophilic properties and free swelling in contact with water vapor
TL;DR: In this article, synthetic ASR gels with 20 different chemical compositions similar to those found in field concretes were produced, and the effects of composition (i.e., Ca/Si, Na/Si and K/Si) on their hydrophilic and swelling behavior were investigated.
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Deleterious Reactions of Aggregate With Alkalis in Concrete
TL;DR: Concrete is the most popular building and construction material with an annual production volume exceeding 7.5 km3 as discussed by the authors, or about 20 billion tonne, and is the prime ingredient in the world's largest and most prominent structures and landmark edifices.
References
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Journal ArticleDOI
The nature of opal I. nomenclature and constituent phases
J. B. Jones,E. R. Segnit +1 more
TL;DR: In this paper, the X-ray diffraction pattern was used to classify hydrous silicas into three structural groups: well-ordered α-cristobalite, opal-CT and highly disordered, near amorphous opal.
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A study of the changes in weight, length and interplanar spacing induced by drying and rewetting synthetic CSH (I)
W.A. Gutteridge,L.J. Parrott +1 more
TL;DR: In this paper, two samples of synthetic calcium silicate hydrate, CSH(I), having a CaO:SiO 2 molar ratio of 0.965:1 were compacted into thin discs and saturated with water.
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Test methods for determining potential alkali-silica reactivity in cements
John Brotschi,P. Kumar Mehta +1 more
TL;DR: The ASTM C227 test can be modified to develop performance tests for predicting potential alkali-silica reactivity of both portland and blended portland cements as mentioned in this paper.