灌注式半柔性道面材料抗冲击性能试验研究

摘要

在大量试验的基础上，重点研究了灌注式半柔性道面材料的抗冲击性能。运用 SHPB 试验装置，对空隙率为20％、23％、25％、27％和30％的半柔性道面材料分别进行了0．25、0．30、0．35和0．4 MPa 共4种气压的冲击试验，分析数据发现较低气压冲击作用下（0．25，0．3 MPa），空隙率为25％的半柔性道面材料峰值应力最大；在较高气压冲击作用下（0．35，0．4 MPa），空隙率为27％的半柔性道面材料峰值应力最大。综合材料在冲击作用下峰值应力和破坏形态等因素，空隙率为27％的半柔性道面材料抗冲击性能优于其余4个空隙率的材料。%Impact resistance of poured semi -flexible pavement material was studiedbased on man-y tests.The impact tests,under four levels of pressure(0.25,0.30,0.35 MPa and 0.4 MPa),were con-ducted on semi-flexible pavement materials with five different void contents(20%,23%,25%,27% and 30%),by using split Hopkinson pressure bar (SHPB)equipment.After analyzing test data,we found that under the effect of lower pressure(0.25 MPa and 0.30 MPa),it is the material with 25%void con-tent whose peak stress is the biggest while under the effect of higher pressure(0.35 MPa and 0.4 MPa), it is the material with 27%void content whose peak stress is the biggest.Comprehensive consideration of peak stress and failure shapes,semi -flexible pavement material with 27% void content is better than four other materials in terms of impact resistance.