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Effect of atmospheric pressure on properties of AEA and air entrained concrete

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Document pages: 7 pages

Abstract: The effects of atmospheric pressure on the properties of air entraining agent (AEA) and air entrained concrete were studied in Tibet and Hubei. The results show that the reduced atmospheric pressure increases the surface tension of the solution and reduces the foaming performance of the solution. AEA has excellent foaming ability and stability. It is the first choice under low pressure. At low pressure, the freeze-thaw deterioration process of hardened slurry is relatively fast. The influence of air pressure on the frost resistance of concrete is more sensitive than that of mechanical properties. The uneven distribution of macropores and internal pores leads to the deterioration of macro performance of concrete. Therefore, AEA varieties should be preferred, and the dosage of AEA should be B increased, and pore structure of pastes should be optimized to ensure the durability of concrete frost resistance for construction in low-pressure areas.

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