混杂纤维掺量对再生混凝土力学性能的影响研究

试验研究了钢纤维和聚丙烯纤维单一掺入,以及混合掺入时对再生混凝土力学性能的影响。结果表明:在再生混凝土中掺入钢纤维后,其各项力学性能都有所提高;单掺入聚丙烯纤维后其抗压强度有所降低,但显著提高了其劈裂抗拉强度和弹性模量;掺入混杂纤维后其抗压强度介于单掺钢纤维和单掺聚丙烯纤维之间,弹性模量受钢纤维掺量的影响较大,劈裂抗拉强度有显著提高,最高增强率达53.8%。加入纤维后,再生混凝土由脆性破坏变成塑性破坏。

Experimental study on mechanical properties of hybrid fiber basic of recycled concrete

Experiment sdudies on the mechanical properties of recycled concrete in which steel fiber and polypropylene fiber are incorporated with a single incorporation and mixed one were carried out. Results show that the compressive strength, tensile strength and elastic modulus are all improved with the addition of steel fiber into recycle concrete. While the cube compressive strength and axial compressive strength of recycled concrete is slightly reduced by the mixing of polypropylene fiber, but its tensile strength and elastic modulus are obviously increased. Different bybrid fibers mixed into recycle concrete have invisible effect on compressive strength of recycle concrete, and the compressive strength is between the separate addtion of steel fiber and polypropylene fiber. The elastic modulus of hybrid fiber mixed with recycled concrete is influenced by the amount of steel fiber. The splitting tensile strength of the recycle concrete is significantly increased by the addtion of hybride fiber, the maximum strength is incresed by 53.8%. With the addition of fiber, the failure mode of the recycle concrete changed from brittle failure to ductile failure.