Evaluation of Rheological Properties of High-Strength Self-Compacting Concrete Cement Paste Based on Water Film Thickness

doi:10.16552/j.cnki.issn1001-1625.2025.0218

Abstract

Abstract: To investigate the effect of ultrafine fly ash (UFA) on the rheological properties of cement paste in high-strength self-compacting concrete (HSSCC), this study tested the influences of different UFA dosages on the fluidity, rheological properties, packing density, and water film thickness (WFT) of C60 and C80 HSSCC cement pastes. The results show that when the UFA dosage is 15% (mass fraction), the fluidity of both cement pastes reaches their maximum, while the yield stress, apparent viscosity, and thixotropy reach their minimum. At this dosage, the packing density of both cement pastes is also at their highest. The packing density of C80 HSSCC cement paste is higher than that of C60 HSSCC cement paste, whereas the WFT of C80 HSSCC cement paste is lower than that of C60 HSSCC cement paste. Specifically, the WFT of C60 HSSCC cement paste is 0.195 7 μm, while that of C80 HSSCC cement paste is 0.037 1 μm. Polynomial regression fitting reveals a strong correlation between WFT and the yield stress of cement paste.

Key words: ultrafine fly ash, cement paste, rheological property, yield stress, packing density, water film thicknes

CLC Number:

TU528

HU Yanyan, XIE Bingqian, ZHAO Bing. Evaluation of Rheological Properties of High-Strength Self-Compacting Concrete Cement Paste Based on Water Film Thickness[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3188-3195.

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