Abstract
Flash setting behavior of a Type I Portland cement clinker with and without the presence of gypsum (calcium sulphate dihydrate) used as a set regulator has been studied by using thermogravimetry and differential thermal analyzing techniques. The effect of sulphate addition in controlling the flash set is monitored over the critical initial period of hydration and its consequences on the ultimate setting properties of clinker are discussed. A correlation between degree of hydration and flash setting, caused mainly by a rapid reaction between water and the phase tricalcium aluminate present in the clinker, is also established by estimating the amount of chemically bound water and free calcium hydroxide incorporated in the hydration products formed from clinker-water and clinker-calcium sulphate-water systems. It is shown that the addition of sulphate ions effectively controls the early clinker hydration possibly by reacting with tricalcium aluminate to form ettringite that shields it from further rapid hydration.
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