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A discussion of the paper “Mechanism of alkali-silica reaction and the significance of calcium hydroxide” by H. Wang and J.E. Gillot

✍ Scribed by S. Chatterji

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
167 KB
Volume
22
Category
Article
ISSN
0008-8846

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✦ Synopsis

This is a very interesting and informative paper. In this paper the authors have attempted to resuscitate Powers-Steinour hypothesis of alkali-silica reaction. In their scheme calcium ion has given an added role of the rejuvenator of alkali hydroxide and the effects of the hydraulic radii of different ions have been added. These have been done years after we have drawn attention to the roles of Ca(OH)2 and hydrated ionic sizes. However the basic features of Power-Steinour hypothesis were kept intact as can be seen from the statement: "Alkali-silica groups have a high affinity for water and therefore, a swelling colloidal alkali-silica complex is produced capable of sorbing water so that pressure is built up leading to expansion". In Fig. 2 of their paper they have sketched a detailed picture of alkali-silica reaction and the role of calcium in it.

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Experiments indicate that Ca(OH)2 [CH] aggravates alkali-silica reaction causing increased expanslon of mortar bars. Ca(OH) 2 has two major functions: firstly it acts a "buffer" to maintain a high pH, i.e. a high concentration of hydroxyl ions in pore solutions; secondly, Ca++ ions may exchange for

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We would like to thank Dr. Chatterji for his interesting and detailed comments on our paper. We agree with Dr. Chatterji that our thinking owes a great deal to the pioneering work of Powers and Steinour though our new data has led us to propose what we feel are significant changes to the original hy

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The authors have investigated an interesting relationship and found some rather unexpected results which they have reported very well. I have some questions. I. Should CaCI 2 be expected to do anything to entrain air? Shideler (1952) remarked that "although a precipitate was formed when the CaC12 an