刚性聚丙烯纤维改性透水混凝土制备及路用性能研究

2021-01-07 13:36:16宋祥,张喆
粘接 2021年12期

宋祥,张喆

摘 要:针对传统透水混凝土极限承载性差,抗冻融性能低,以及易开裂和粗骨料间粘接力弱的问题,制备一种刚性聚丙烯纤维的透水混凝土,并从抗冻性能、耐腐蚀性能和早期收缩性能对制备的混凝土试件进行测试。结果表明,掺入刚性聚丙烯纤维后,可有效改善混凝土的抗冻融性,且掺入8.73 kg/m3刚性聚丙烯纤维时,纤维混凝土抗冻性能达到最佳;在耐蚀系数方面,本试验制备的纤维混凝土的耐蚀系数有显著提高;在早期收缩性能方面,随着时间的推移,试验组早期收缩明显减小,且掺入8.73 kg/m3的刚性聚丙烯混凝土的试验组在45 d后的收缩量为-3.91×10-4 ,普通透水性混凝土对照组的收缩量为-5.41×10-4 mm。

关键词:刚性聚丙烯纤维;透水混凝土;耐久性能;抗冻性能

中图分类号:U414 文献标识码:A 文章编号:1001-5922(2021)12-0120-05

Research on Preparation and Road Performance of Permeable Concrete Modified by Rigid Polypropylene Fiber

Song Xiang,  Zhang Zhe

(Shaanxi Polytechnic Institute, Xianyang 712000, China )

Abstract:Traditional permeable concrete has poor ultimate bearing capacity, low freeze-thaw resistance effect, easy cracking and weak adhesion between coarse aggregate. A rigid polypropylene fiber permeable concrete is prepared, and the prepared concrete specimens are tested from freezing resistance, corrosion resistance and early shrinkage performance. The results show that the freeze-thaw resistance of concrete can be effectively improved by adding rigid polypropylene fiber, and the freeze-thaw resistance of fiber concrete reaches the best when adding 8.73 kg/m3 rigid polypropylene fiber. Furthermore, the corrosion resistance coefficient of the prepared fiber reinforced concrete has been significantly improved. In terms of early shrinkage property. And the early shrinkage of the experimental group decreases significantly with time goes on. The shrinkage of the experimental group mixed with 8.73 kg/m3 rigid polypropylene concrete is -3.91×10-4 after 45 days, while the shrinkage of the control group mixed with ordinary permeable concrete is -5.41×10-4 mm.

Key words:rigid polypropylene fiber; permeable concrete; durability; freezing resistance.

0 引言

混凝土作為目前最常用的一种路面铺装材料,但传统混凝土透水性能差,雨雪天气后,路面湿滑,安全隐患大。透水混凝土能规避安全隐患问题,使得雨雪水能快速下渗集中到专用排水通道中。在实际工程中,透水混凝土因为其疏松多孔的结构特性,常出现极限承载性能差、抗冻融性能低、易开裂、粗骨料间粘接力弱等问题。保持混泥土透水特性的同时又能增加其性能是目前研究较为重要的课题,黄建凯等(2018)尝试利用复合掺合料和聚合物对透水混凝土进行改性[1];赵剑锋等(2019)则希望通过掺加短切纤维增加透水混凝土的性能[2];以上学者的成果给我们带来新的思考,但在实际运用中,还是存在一定问题。……

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