粉煤灰对高性能混凝土抗裂性能的影响研究

Study on effect of fly ash on crack resistance of high-performance concrete

主要就不同掺量粉煤灰对高性能混凝土的抗裂性能影响进行研究,研究结果表明:在掺量20%内,粉煤灰的掺入有利于改善高性能混凝土抗裂性能;改良试验条件后再次开展平板试验,结果显示高性能混凝土的开裂时间和最大裂缝宽度随粉煤灰掺量的提升而得到改良,但开裂面积表现出不同发展趋势,其中最低点出现于掺量为20%时;进一步增加掺量,混凝土抗裂性能反而出现降低,建议取20%左右掺量粉煤灰改良高性能混凝土抗裂性能。

In this paper,the effects of different amounts of fly ash on the crack resistance of high-performance concrete are studied.The results show that the incorporation of fly ash is conducive to improving the crack re⁃sistance of high-performance concrete within 20%content,and the results show that the cracking time and maximum crack width of high-performance concrete are improved with the increase of fly ash content,but the cracking area shows different development trends,and the lowest point is 20%.It is recommended to take about 20%of fly ash to improve the crack resistance of high-performance concrete.