聚乙烯和聚丙烯纤维对混凝土工作性能影响分析

Analysis of the influence of polyethylene and polypropylene fiber on the workability of concrete

为研究活性矿物掺合料(聚乙烯纤维和聚丙烯纤维)对混凝土性能改进的影响,通过设计6组不同的配合比试验,对混凝土坍落度、抗压强度和抗拉强度试验进行测试分析,得出:(1)不掺入掺合料的混凝土的坍落度为67.8 mm,28 d的抗压强度和抗拉强度分别为48.3、6.1 MPa;(2)单掺2%聚乙烯纤维的混凝土的坍落度为63.7 mm,28 d的抗压强度和抗拉强度分别为49.6、6.4 MPa;单掺2%聚丙烯纤维的混凝土的坍落度为58.3 mm,28 d的抗压强度和抗拉强度分别为52.8、7.4 MPa;(3)混合掺入聚乙烯纤维和聚丙烯纤维的混凝土坍落度、抗压强度和抗拉强度性能均得到提高,其中最佳混合掺量为0.5%聚乙烯纤维+1.5%聚丙烯纤维,其混凝土的坍落度为57.6 mm,28 d的抗压强度和抗拉强度分别为53.4、7.6 MPa。因此,单掺混凝土的性能要好于不掺入掺合料的混凝土,双掺混凝土要优于单掺混凝土。

In order to study the influence of active mineral admixtures(polyethylene fiber and polypropylene fiber)on the improvement of concrete performance,the slump,compressive strength and tensile strength of concrete were tested and analyzed through six groups of different mix proportion tests.The results are as follows(1)The slump of concrete without admixtures is 67.8 mm,the compressive strength and tensile strength in 28 d are 48.3 MPa,6.1 MPa.(2)The slump of concrete mixed with 2%polyethylene fiber is 63.7 mm,and the compressive strength and tensile strength of concrete mixed with 2%polypropylene fiber are 49.6 MPa and 6.4 MPa respectively in 28 d.The slump of concrete mixed with 2%polypropylene fiber is 58.3 mm,and the compressive strength and tensile strength of concrete mixed with polyethylene fiber and polypropylene fiber are 52.8 MPa and 7.4 MPa respectively in 28 d.(3)The slump and compressive strength of concrete mixed with polyethylene fiber and polypropylene fiber and the tensile strength of the concrete is improved,in which the best mixed content is 0.5%polyethylene fiber+1.5%polypropylene fiber,the slump of the concrete is 57.6 mm,and the compressive strength and tensile strength of the concrete are 53.4 MPa and 7.6 MPa respectively in 28 d.Therefore,the performance of single mixed concrete is better than that of non mixed concrete,and the performance of double mixed concrete is better than that of single mixed concrete.