Abstract: On the basis of the shotcrete ratio, the 3 different amounts of ceramsite and basalt fiber are combined. Nine groups of Lightweight Aggregate Fiber Shotcrete (LAFS) were prepared to explore the influence of ceramsite and basalt fiber on the compression, tensile and shear strength of LAFS. Based on the test results, a LAFS strength prediction model was established. At the same time, with the help of RFPA^2D software simulation, the force characteristics and failure laws of ceramsite and basalt fiber in the process of LAFS are obtained. The results show that the content of ceramsite and basalt fiber has an interactive effect on the compressive, tensile and shear strength of LAFS. Test analysis shows that the LAFS performance is the best when ceramsite is mixed with 116.248 kg/m³ and basalt fiber is mixed with 5.26 kg/m³. Adequate bonding of ceramsite and LAFS is the key to ensure the strength of LAFS. The fiber has good integrity during the LAFS stress process. Before LAFS breaks, it can bear the force together with the concrete matrix. This research can provide experimental and theoretical basis for the development of LAFS in engineering.

Key words: lightweight aggregate shotcrete, mechanical properties, ceramsite, basalt fiber, RFPA^2D, composites