混杂纤维轻骨料混凝土的力学和抗冻性能研究

为了研究钢纤维和聚丙烯纤维对轻骨料混凝土性能的影响，共设计了16组轻骨料混凝土试件，其中有9组混杂纤维轻骨料混凝土，3组钢纤维轻骨料混凝土，3组聚丙烯纤维轻骨料混凝土和1组普通轻骨料混凝土试件。试验结果表明:当钢纤维体积率为1.0%，聚丙烯纤维体积率为0.05%时，混凝土的抗压强度最大为39.16 MPa，提高了17.92%；当钢纤维体积率为1.5%时，抗拉强度最大为4.77 MPa，提高了63.36%。50次冻融循环试验后混凝土的强度损失率最低的是Ssp3组，即钢纤维体积率为1.0%，聚丙烯纤维体积率为0.15%时，强度损失率最低为1.79%，降低了68.92%。

Mechanical and Frost Resistance Properties of Lightweight Aggregate Concrete Reinforced by Hybrid Fiber

To study the effect of steel fiber and polypropylene fiber on the performance of lightweight aggregate concrete，16 groups of lightweight aggregate concrete were designed including 9 groups of hybrid fiber reinforced lightweight aggregate concrete，3 groups of steel fiber reinforced lightweight aggregate concrete，3 groups of polypropylene fiber reinforced lightweight aggregate concrete and 1 group of lightweight aggregate concrete without fiber. The test results showed that the maximum compressive strength of concrete was 39.16 MPa，increasing by 17.92% when the volume fractions of steel fiber and polypropylene fiber were 1.0% and 0.05%，respectively. The maximum tensile strength was 4.77 MPa，increasing by 63.36% when the volume fraction of steel fiber was 1.5%. After 50 times of freezing and thawing test，the lowest strength loss rate of concrete was the group of Ssp3. The lowest strength loss rate of concrete specimen was 1.79%，decreasing by 68.2% when the volume fractions of steel fiber and polypropylene fiber were 1.0% and 0.15%，respectively.