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Effects of three Turkish fly ashes on the heat of hydration of PC-FA pastes

✍ Scribed by Mustafa Tokyay

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
214 KB
Volume
18
Category
Article
ISSN
0008-8846

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✦ Synopsis

Effects of the type and amount of fly ash substitution on the heat of hydration of portland cement-fly ash pastes were investigated. Three Turkish fly ashes were used. One of them was a high-calcium and the other two were low-calcium fly ashes. The specimens contained 0, I0, 20, and 40% fly ash by weight of portland cement.

The tests were carried out as described in ASTM C 186 however one separate set of specimens were first subjected to an early external temperature of 67Β±2Β°C for six hours followed by the standard temperature until time of test.

The results revealed that the low-calcium fly ashes, regardless of their type, reduce the heat evolution when used for partial cement replacement.

The high-calcium fly ash, on the other hand, does not produce significant changes in the heat of hydration.

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