Mechanical and Microscopic Properties of Hybrid Fibers Reinforced Self-Compacting Concrete

The mechanical and microscopic properties of hybrid fibers reinforced self-compacting concrete (SCC) were investigated. The results indicate that both cellulose and carbon fibers can decrease the compressive strength, the 28d compressive strength reduces by 21.8% in comparison with reference concrete when the content of 6mm carbon fiber reaches 3.4kg/m(3). Incorporation of both carbon and cellulose fibers can improve the splitting tensile strength. During the orthogonal test on hybrid fibers concrete, the length of carbon fiber exhibits the greatest impact on compressive strength while the content of carbon fiber influences the splitting tensile strength maximally. It can be observed from SEM test that the number and width of cracks in fiber reinforced concrete are significantly less than those of reference concrete while cellulosic fiber shows a weaker inhibitory effect than carbon fiber on cracks.