In order to improve the durability of concrete in freeze thaw environment,the effects of concrete grade and freeze thaw cycle times on the compressive strength and mass loss of concrete with 0.9 kg/m3 polypropylene fiber content were studied.The freeze thaw cycles of C40,C50 plain concrete and polypro-pylene fiber concrete of the same grade were carried out for 50,100,150 and 200 times.The experimental data analyzed by Origin software are used to establish the compressive strength damage model.The results show that when freezing and thawing for 0 times,the compressive strength of C40 and C50 plain concrete added with polypropylene fiber is increased by 4.2％and 3.8％respectively.With the addition of polypro-pylene fiber for 200 times,the loss rate of compressive strength of concrete is reduced by 7.9％and 5.5％,indicating that the frost resistance of polypropylene fiber concrete is better than that of ordinary concrete.Based on the experimental data,the compressive strength damage law of polypropylene fiber concrete with different mix proportion after freeze-thaw cycle is theoretically analyzed,and the mechanical property dam-age law model of concrete after freeze thaw failure is established.
关键词
聚丙烯纤维/冻融循环试验/抗压强度/强度损伤模型
Key words
polypropylene fiber/freeze thaw cycle test/compressive strength/strength damage model
维普
万方数据