摘要
Abstract
In order to clarify the improvement effect of steel fibers on the mechanical properties of recycled concrete,the test was conducted using corrugated steel fibers with four admixture levels(0.5%～2.0%)and three substitution rate gradients(30%～70%).It was found that the maximum values of cubic compressive strength(50.21 MPa),split tensile strength(6.01 MPa)and axial compressive strength(44.23 MPa)of concrete were simultaneously achieved at the combination of 50%substitution rate and 1.5%steel fiber admixture.The proper replacement rate of recycled aggregate(50%)balanced the adverse effects of the increase in the number of internal micro-cracks and interfacial transition zones,and played the advantage of the surface roughness of recycled aggregate to enhance the bonding strength.When the content of steel fiber is 1.5%,the mechanical properties of steel fiber are the best,but when the content of steel fiber is too high,the defects increase and the properties decrease.In practical application,appropriate steel fiber content should be selected to achieve the best mechanical properties.关键词
再生混凝土/力学性能/再生骨料取代率/钢纤维体积掺量Key words
Recycled concrete/Mechanical properties/Regenerated aggregate substitution rate/Steel fiber volume content分类
土木建筑
