聚丙烯纤维增强碱矿渣水泥砂浆性能的研究.pdfVIP

学兔兔 2014年第1 1期 混 凝 土 与 水 泥 制 品 2014 No．11 l1月 CHINA C0NCRETE AND CEMENT PRODUCTS November 聚丙烯纤维增强碱矿渣水泥砂浆性能的研究 张兰芳 一，梁秋爽 ，尹玉龙 (1．重庆交通大学土木建筑学院，400074； 2．重庆交通大学交通土建工程材料国家地方联合工程实验室，400074) 摘 要：研究了不同长度及掺量的聚丙烯纤维对碱矿渣水泥砂浆性能的影响。结果表明：6mm和12ram聚丙烯 纤维掺量为()．04％～0．16％时，能提高碱矿渣水泥砂浆的流动度，改善碱矿渣砂浆的工作性，但随着纤维掺量的增加， 流动度增加幅度减小 掺入6mm聚丙烯纤维0．12％时，砂浆的早、后期抗压强度都有所降低，但28d抗折强度提高 25．5％，折压比提高33．3％；当掺入 12ram聚丙烯纤维O．12％时。28d抗压、抗折强度分别增加11．8％和 30．6％，且28d 折压比提高25％。相比而言，在同等掺量时，掺入12mm的聚丙烯纤维对碱矿渣水泥砂浆抗压、抗折强度的贡献优 于掺入6nun的聚丙烯纤维。 关键词：聚丙烯纤维；掺量；纤维长度；碱矿渣水泥砂浆；力学性能 Abstract：The effects of polypropylene fiber under different length and different admixture content on the properties of alkali—activated slag cement mortar are studied．TJ1e results show that when the polypropylene fiber contents with 6mm and 12mm length are 0．04％-0．16％．workability of alkali—activated slag cement mortar is improved．but with the inereas— ing of fiber content，the fluidity increasing extent decreases．When the content of the polypropylene fibers with 6ram length is 0．1 2％，the compressive strengths of the mortar at the earlier and later stages decrease，but their 28d flexural strengths increase by 25．5％ and the ratio of flexural and compressive strength increase by 33-3％ as wel1．When the con— tent of the polypropylene fiber with 1 2mm length is 0．1 2％，the 28d compressive strength and flexural strength increase by 11．8％ and 30．6％ respectively and its 28d ratio of flexural and compressive strength also increases by 25％．By eom