Ceramics-Silikáty 50, (1) 5 - 14 (2006) |
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EFFECT OF POLYCARBOXYLATE SUPERPLASTICIZER ON HYDRATION CHARACTERISTICS OF CEMENT PASTES CONTAINING SILICA FUME
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Heikal Mohamed 1, Morsy Mohamed Saad 2, Aiad Ismail 3
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1 Chemistry Department, Faculty of Science, Benha University, Benha, Egypt
2 Building Physics Department, Building Research Center, P. O. Box, 1770, Cairo, Egypt
3 Petrochemical Department, Egyptian Petroleum Research Institute, Cairo, Egypt
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Keywords: Superplalsticizer, Electrical behavior, Rheology, Silica fume, Compressive strength
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This work aims to study the effect of the polycarboxylate superplalsticizer (PCS) on the rheology, electrical conductivity,
physico-chemical and mechanical properties of ordinary Portland cement (OPC) pastes containing silica fume (SF). The
blended cement pastes were prepared from OPC-SF (90 wt.% OPC + 10 wt.% SF). The results show that addition of PCS to
the cement blends decreases their electrical conductivity during the early and later ages up to 28 days. In addition, PCS
admixture considerably affects the amount of chemically combined water. Compressive strength of OPC pastes is higher than
that of pastes containing SF. However, the addition of 0.75-1.5 wt.% PCS brings higher compressive strength values of
OPC-SF pastes than those of OPC cement pastes. |
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