PERFORMANCES OF HYBRID FIBERS REINFORCED RECYCLED PARTICLES CONCRETE

Hybrid fibers reinforced recycled particles concrete (HFRRPC) have been obtained by adding the cornstalk and bamboo hybrid fiber modified treatment in recycled particles concrete. In this paper, the addition proportion of hybrid fiber treated with hybrid fiber coupling is respectively 0.0%, 5%, 10%, 13.5%, 16% and 18.5% for HFRRPC. Six groups of cubes specimens with 100mm x 100mm x 100mm and six groups of cylinder specimens with 100mm x 100mm under different amount of hybrid fiber (such as 0.0%, 5%, 10%, 13.5%, 16% and 18.5%) were made. The standard curing period was 28d for the six groups of cubes and cylinder specimens. Based on the compressive strengths of six groups of cubes specimens, split tensile strengths of six groups of cylinder specimens and some dry shrinkage test specimens, this paper discussed the relationship between the addition proportion of hybrid fiber and compressive strength, splitting tensile strength and dry shrinkage performance. The issues of optimal addition proportion of hybrid fiber for the cleavage strength were found, and the optimal addition proportion is 13%.