聚丙烯纤维与胶粉复掺对混凝土收缩性能的影响.pdfVIP

学兔兔 2015年第10期 混凝土 与水泥制 品 2015 No．10 10月 CHINA C0NCRETE AND CEMENT PRODUCTS 0ctober 聚丙烯纤维与胶粉复掺对混凝土收缩性能的影响 郑小军，杨建森，伏利鹏 (宁夏大学土木与水利学院，银川 750021) 摘 要：针对我国内陆寒冷盐碱地区的环境特性，制备了面向该环境混凝土路面工程应用的聚丙烯纤维复合胶 粉改性混凝土，采用正交试验研究了该混凝土材料的收缩性能，建立了收缩模型，并运用游程检验法检验了其显著 性。结果表明，聚丙烯纤维复合胶粉改性混凝土的收缩率 与测试龄期t符合指数函数关系，且在显著性水平 = 0．O1下其相关性显著；聚丙烯纤维乖肢粉掺量对混凝土的收缩影响明显，并与混凝土的最大收缩率之间存在显著的 数学模型关系。胶粉会增大混凝土后期的干燥收缩，纤维掺量的增加能够有效抑制混凝土的收缩。硅粉掺量为2．5％ 和纤维长度为6mm时混凝土的收缩最小 关键词：聚丙烯纤维；胶粉；正交试验；收缩率 Abstract：Aiming at the characteristics of cold saline—alkali areas of inland in our country，polypropylene fiber com— positing latex powder modified concrete(PFCLPC)is prepared for application of cement concrete pavement engineering in this environment．Shrinkage performance of the concrete is investigated through o~hogonal experiment，shrinking model of PFMLPC is set up by regression analysis and the iun test is used to test significance of the mode1．The results show that the shrinkage ratio e,of PFCLPC and the testing age t can fit the relationship of exponential function，and the correlation is significant when the significant level is O．O1．The influence of dosage of polypropylene fiber or latex powder on shrink- age of concrete is obviously，and a significant relationship of mathematical model exists between the maximum shrinkage ratio and them．Latex powder enhances shrinkage of concrete，on the contrary，with the increasing of fiber content，the shrinkage of concrete can reduce effectively．When content of silica fume is 2．5％ or fibre length is 6 mm．shrinkage of PFCU)C is minimum． Key words：Polypropylene fiber；Latex powder；Orthogonal experiment；Shrinkage ratio 中图分类号：TU528