Cement,silica fume,fly ash,quartz sand,steel fiber and stones were used as raw materials,and the tests were carried out with compressive strength of 100 MPa,flexural strength of 11.5 MPa and fluidity of 600 mm as standards.The influence of three kinds of steel fibers with different sizes on the mechanical properties of lining concrete was studied through experiments.The results show that three kinds of steel fibers with different sizes meet the performance of high-strength concrete,but the steel fiber with length-diameter ratio of 65 has better performance,and when the fiber content is 2%,the fibers are distributed along the crack surface,which has better toughening effect.It is found that the compressive strength is significantly improved after adding coarse aggregate,but the flexural performance will decrease.At the same time,due to the large particle size of stones,the adhesion between fibers and the whole system will be reduced,which will significantly reduce the rheological properties of concrete.After comprehensive evaluation,the upper limit is 30%of the total aggregate quality.
NETL
NSTL
万方数据
维普
