Design of Air Content of Frost Resistance Air-Entrained Concrete in Plateau Area

Abstract

Abstract: The effect of low atmospheric pressure environment of plateau on air content loss, the change of bubble spacing coefficient and the critical value of frost resistance durability index were studied through testing the air content, bubble spacing coefficient and frost resistance durability index of air-entrained concrete with different water-binder ratios in plateau and plain areas, and collecting correlative results of domestic and foreign researches. The results show that compared with the plain area, the air content loss of air-entrained concrete increases under low-pressure environment in the plateau, and the air content loss is about 1.0%~1.5% during the hardening process. There is a good linear relationship between the air content of hardened concrete and the logarithm of the bubble spacing coefficient, but the bubble structure of air-entrained concrete may be degraded in the environment of low atmospheric pressure on the plateau. There is also a good linear relationship between the bubble spacing coefficient and frost resistance durability index, and it is not affected by atmospheric pressure. An air content design method of air-entrained concrete in plateau area based on the objective of frost resistance durability of concrete is proposed by taking bubble spacing coefficient as the link.

Key words: plateau, air-entrained concrete, air content, bubble spacing coefficient, frost resistance durability index, design method

CLC Number:

TU528.01

LI Xuefeng, FU Zhi, WANG Hualao. Design of Air Content of Frost Resistance Air-Entrained Concrete in Plateau Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2600-2608.

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