A reply to a discussion by S. Chatterji of the Paper “a dilation model for the expansion of silica glass/OPC mortars” by G.W. Groves and X. Zhang

✍ Scribed by G.W. Groves

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 31 KB
• Volume: 21
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(91)90051-i

✦ Synopsis

Dr. Chatterji queries why coarse clinker grains added to an OPC paste did not produce significant expansion by virtue of the larger volume of hydration product compared to the volume of clinker from which it formed. It may be suggested that the answer lies in the location of the hydration product of C3S which is known to be partly "inner product" and partly "outer product", the latter being formed in solution-filled space away from the clinker grain. Only "inner product" would be expected to cause expansion if its volume exceeded that of the original clinker and it is not clear to what extent this is so. In our paper we assumed, for the lack of contrary evidence, that the gel formed by reaction of the silica was, in effect, all inner product, that is to say that all the reacted silica was located in gel formed at the boundaries of the particles. *CCR 20(3) 453-460 (1990)