The decomposition of tricalcium silicate, 3CaO.SiC>2, into dicalcium silicate and free lime, has been studied in the temperature region 1,000-1,300C. The extent of decomposition, measured by means of free-lime determinations, was found to be greatest at about 1,175C. After a day's heating at this temperature the de- composition was about fifteen times as great as after a day's heating at 1,000C.
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Elmer T. Carlson (1931) studied this question.