2020 Volume 76 Issue 3 Pages 239-254
The purpose of this research is to realize lightweight and high strength prestressed concrete slab by using lightweight concrete mixed with short fibers.
In this paper, it was confirmed that the PVA short fiber mixing ratio should be 0.5vol.% or less in order to obtain mechanical performance equivalent to those of lightweight aggregate concrete with a compressive strength of 50 MPa. In addition, it was confirmed that the lightweight PC slab mixed with 0.5vol.% PVA short fibers had the same punching shear capacity as the normal PC slab. Furthermore, the increase in shear capacity of lightweight PC slab mixed with short fibers was considered to be due to suppression of crack extension in the RC section and the accompanying tide arch formation in the PC section.
