Ceramics-Silikáty 44, (3) 109 - 113 (2000) |
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ADDITION OF LIMESTONE IN THE LOW HEAT PORTLAND CEMENT: PART 1 |
El-Alfi El-Sayed 1, Darweesh Hassan 1, El-Didamony Hamdy 2 |
1 National Research Centre,
Dokki, Cairo, Egypt
2 Faculty of Science, Zagazig University,
Zagazig, Egypt
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The substitution of about 50 wt.% of gypsum by limestone in Portland cement affects the particle size distribution, decreases
the total porosity and accelerates the rate of hydration of cement paste. The effect of partially up to fully substitution of
gypsum in the laboratory prepared low heat Portland cement on the characteristics of the hardened cement pastes up to
90 days of hydration was studied. The results show that the substitution of 60 wt.% of gypsum by fine limestone improves the
rate of hydration at early ages up to 28 days. In addition, the elevated amount of limestone increases the heat of hydration
and enhances the compressive strength at early ages. |
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