冻融环境下钢纤维对轻骨料混凝土力学性能的影响

Effect of steel fiber on mechanical properties of lightweight aggregate concrete to freeze-thaw environment

以天然浮石为粗骨料,对钢纤维及钢纤维与聚炳烯纤维混合的不同掺量试件进行了25、50、75次慢冻试验,进行了抗压强度、抗折强度及弹性模量的试验,试验发现:随着冻融次数的增加,混凝土的强度损失率逐渐增大,弹性模量和抗折强度有所降低,但是聚炳烯纤维和钢纤维的混合掺入可以有效地在保持混凝土的强度基础上,改善混凝土的韧性。

The slow freeze-thaw tests are carried out for 25,50,75 times to two types of concretes： SFLWAC and LWAC mixed with steel fiber and polypropylene fiber.The variation of compressive strength,flexural strength and modulus of elasticity are analyzed after various cycles of freeze-thaw.The results show： on one hand, the ratio of loss of strength rises gradually; on the other hand, flexural strength and modulus of elasticity reduce.Besides,the adding of steel fiber and polypropylene fiber can keep maintain the strength of the concrete efficiently,but also improve tenacity of the concrete.