English：

According to the requirements of crack resistance and mechanical properties of emery floorpanel in large parking lot, the mix ratio of C25 concrete with different polypropylene fiber content wasdesigned, and the tests of compressive strength, flexural strength and dry shrinkage crack resistance werecarried out. The results show that when the content of polypropylene fiber is 1.3kg / m3, thecomprehensive performance of concrete is the best, and the compressive strength of 28d is 30. 9MPa,which is 9.6% higher than that of the reference group. The flexural strength reached 7.3MPa, increasedby 25.9%. The first occurrence time of cracks is extended to 7d, and 28d maximum crack width is only0.06mm, and the crack resistance is significantly improved. Based on the optimal dosage, combined withan airport parking lot project, the construction technology system of 80mm thick polypropylene fiber⁃rigidsand composite floor panel is constructed. The application test shows that the surface of the floor panel isflat and there are no harmful cracks. The compressive strength and flexural strength of the on⁃site coringare better than the test values, which meet the requirements of long⁃term high⁃load use of large parkinglots.