Effect of Nano-Alumina on Rheological Property, Hydration and Hardening Strength of Portland Cement Paste

Abstract

Abstract: The effects of nano-alumina (NA) on the early rheological properties, mid-term hydration rate and long-term mechanical properties of Portland cement pastes were studied, and the correlation of these parameters were analyzed. Results show that the addition of NA increases the yield stress and plastic viscosity of fresh cement paste, and the maximum growth rates of these two parameters are more than 110% when NA content is 3% to 5%. NA significantly changes the hydration heat flow rate and heat release of Portland cement in the early stage, and increases the compressive strength and bending strength of paste at various ages. For this composite paste system, the early hydration heat release and rheological parameters show an exponential growth trend, while the peak rate of heat flow has an approximate linear function relationship with the compressive strength.

Key words: nano-alumina, Portland cement paste, rheological property, hydration exothermic, compressive strength, bending strength

CLC Number:

TU528

XIE Xiaojie, WANG Shen. Effect of Nano-Alumina on Rheological Property, Hydration and Hardening Strength of Portland Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 1911-1917.

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