Discussion
Match the compound with what it contributes.
1. Tricalcium silicate 2. Dicalcium silicate 3. Tricalcium aluminate
P. Flash set and the greatest heat Q. Early strength R. Later strength
Answer: A
Correct answer: 1-Q, 2-R, 3-P
The three principal compounds divide the work between them. Tricalcium silicate hydrates quickly and gives the early strength. Dicalcium silicate hydrates slowly and supplies the later strength, contributing little in the first week. Tricalcium aluminate gives almost no strength but reacts violently with water, producing a flash set and the greatest heat of any of the compounds.
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