Sediment Quality Guidelines

Abstract

The mixture of the C-S-H phase of molar ratio about 1.6 and CH were prepared by shaking the amorphous silica and calcium hydroxide in molar ratio equal to 2, in water during one month. By burning this mixture at 800 and 900°C belite was obtained with a very small admixture of other calcium silicate phases. Some hardening activators were also added before burning, namely sodium and potassium sulphates and barium silicate. Belite phase had very high specific surface and quickly reacted with water giving one exothermic peak on the microcalorimetric curve. One sharp peak was also noted on the curve presenting calcium concentration in the paste immediately after mixing with water. The highest heat of hydration was found for the sample with 10% addition of barium silicate. Copyright © 1997 Elsevier Science Ltd.