Effects of Air-Entraining Agent and Desert Sandon Properties of Concrete

Abstract

Abstract: In order to investigate the effects of desert sand replacement rate and air-entraining agent dosage on C30 concrete, desert sand (six replacement rates) and air-entraining agent (five dosages) were mixed into concrete in quantitative combinations to determine their effects on the air content of fresh concrete, slump, gas content after 1 h and 28 d compressive strength. The test results show that desert sand has a certain inhibitory effect on the gas content of fresh air-entrained concrete, and the inhibition effect increases with the increase of desert sand replacement rate, but it has no obvious effected on the gas content of air-entrained concrete after 1 h. With the increase of air-entraining agent dosage and desert sand replacement rate, the slump and 28 d compressive strength of concrete both increase first and then decrease. The compressive strength reaches the maximum when the replacement rate of desert sand is 40% (mass fraction) and the dosage of air-entraining agent is 0.002% (mass fraction). Reasonable combination of air-entraining agent and desert sand into concrete can significantly improve the working performance and compressive strength of concrete.

Key words: concrete, desert sand, air-entraining agent, gas content, 1 h gas content, slump, compressive strength

CLC Number:

TU528

LYU Shenghui, Sawulet·BEKEY, Almas·YERBOLAT, QIN Sen. Effects of Air-Entraining Agent and Desert Sandon Properties of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2321-2326.

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