聚丙烯纤维控制特细砂混凝土塑性收缩裂缝试验研究  

Research on Controlling Plastic Shrinkage Cracking of Superfine Sand Concrete by adding Polypropylene Fibers

作　　者：吴芳[1] 蔡贵生[1] 杨长辉[1] 王凌宇 李泽刚[1] 

机构地区：[1]重庆大学建材系,重庆400045 [2]中铁十九局重庆市盐井项目部,重庆400000

出　　处：《重庆建筑大学学报》2003年第5期81-86,共6页Journal of Chongqing Jianzhu University

基　　金：重庆大学骨干教师资助基金

摘　　要：特细砂具有平均粒径小、比表面积大的特点,用其配制的大流动性混凝土极易出现塑性收缩裂缝。因此,对特细砂混凝土塑性收缩防裂措施进行研究,具有重要的现实意义。通过平板端约束试验,研究了聚丙烯纤维掺量对特细砂混凝土塑性收缩裂缝面积、裂缝宽度以及水分蒸发速率的影响,探讨了该纤维的阻裂机理。Superfine sand is characterized by small average particle size and large specific surface area. It is easy to form plastic shrinkage cracks for high flowing concrete with superfine sand as fine aggregate. Thus, research on measures for superfine sand concrete to get rid of plastic shrinkage cracks is of important practical significance. In this paper, the influence of polypropylene fiber dosage on plastic shrinkage crack area as well as crack width and rate of water evaporation of superfine sand concrete were studied by way of an endrestrained span metal specimen, and crackresistant mechanisms of polypropylene fiber on superfine sand concrete was analyzed.

关 键 词：聚丙烯纤维 特细砂混凝土 塑性收缩 裂缝 试验 水分蒸发 

分 类 号：TU528.572[建筑科学—建筑技术科学]