employee
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
UDC 666.76
UDC 666.974.2
CSCSTI 81.09
Russian Classification of Professions by Education 18.06.01
Russian Library and Bibliographic Classification 383
Russian Trade and Bibliographic Classification 627
The paper studies the kinetics of hydration of high-alumina cement HAC-70 with ZrO2 and AlOCl additives and their influence on the composition, structure and strength of cement stone. It has been shown that in the presence of ZrO2 (10 wt.%), the rate of cement hydration decreases and the content of hydroaluminates CAH10, C2AH8 and aluminum hydroxide in the hydration products decreases. The addition of aluminum oxochloride AlOCl (0.5 wt.%) accelerates hydration and helps increase the compressive strength of cement stone at the age of 7 days or more. The introduction of ZrO2 into cement promotes the formation of a denser structure of cement stone and an increase in its residual strength during heat treatment in the range of 400-1200°C. It was established that when fused corundum was introduced into the studied cements as a filler, the contact zone between the cement matrix and the filler grains was weak, and cracks formed along it when the sample was loaded. The use of crushed HAC clinker as a filler leads to the formation of a strong contact between the cement matrix and the filler grains, which contributes to a significant increase in the strength of the material.
high-alumina cement, zirconium dioxide, aluminum oxochloride, hydration kinetics, calcium hydroaluminates, structure and strength of cement stone, heat treatment.
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