聚丙烯纤维对再生混凝土力学及收缩性能影响研究

为探讨聚丙烯纤维对再生混凝土力学及收缩性能影响,设计了再生粗骨料替代率为0%、30%、50%的混凝土试块,通过针对未掺与掺入1%聚丙烯纤维的再生混凝土进行力学性能以及收缩性能对比分析,得出以下结论:①随着再生粗骨料掺量的增大,未掺或掺入聚丙烯纤维再生混凝土的抗压强度、抗折强度均逐渐减小,而吸水率和收缩率则逐渐增大;②随着龄期的增长,未掺或掺入聚丙烯纤维再生混凝土的抗压强度和收缩率均逐渐增大;③在再生混凝土中掺入聚丙烯纤维能有效改善其力学性能和收缩性能。

Study on the Effect of Polypropylene Fiber on the Mechanical and Shrinkage Properties of Recycled Concrete

In order to discuss the effect of polypropylene fiber on the mechanical and shrinkage properties of recycled concrete,a concrete test block with a replacement rate of 0%,30%and 50%of recycled coarse aggregate was designed in this paper.through the comparative analysis of the mechanical properties and shrinkage properties of recycled concrete without adding 1%polypropylene fiber,the following conclusions are drawn:①With the increase of recycled coarse aggregate content,The compressive strength and bending strength of recycled concrete without or without polypropylene fiber gradually decrease,while the water absorption and shrinkage increase gradually.②With the increase of age,the compressive strength and shrinkage of recycled concrete without or mixed with polypropylene fiber are both.③The mechanical properties and shrinkage properties of recycled concrete can be effectively improved by adding polypropylene fiber into recycled concrete.