外掺材料对混凝土弯曲韧性的影响  

Influence of additives on flexural toughness of the concrete

作　　者：孙增智[1] 申爱琴[2] 赵永祥 

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [3]陕西路桥集团有限公司,陕西西安710065

出　　处：《西安建筑科技大学学报（自然科学版）》2011年第6期905-911,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：西部交通科技项目道路水泥混凝土组成设计研究资助项目(200531881202)

摘　　要：利用聚丙烯纤维网和聚丙烯酰胺制备高柔韧性混凝土,通过强度试验和弯曲韧性试验,研究了聚丙烯纤维网和聚丙烯酰胺对混凝土韧性的改性效果,并通过扫描电镜对改性混凝土的微观结构进行了全面分析.试验结果表明聚丙烯纤维网和聚丙烯酰胺不仅能提高抗折强度和弯曲韧性,而且对混凝土微观结构的改善有显著作用,并可降低压折比,分析表明聚丙烯纤维网的最佳掺量为0.9kg/m3,聚丙烯酰胺的最佳掺量为8%.High toughness concrete was prepared by mechanically mixing reticulate polypropylene fiber or polyacrylamide with plain concrete.Through strength and flexural toughness test,the modification effects of reticulate polypropylene fiber and polyacrylamide on the toughness of concrete was studied,and the microcosmic structure of concrete was also analyzed by using scanning electron microscope.The test results show that the reticulate polypropylene fiber and polyacrylamide can not only effectively enhance flexural strength and flexural toughness as well as improve microcosmic structure of concrete significantly,but also reduce the ratio of compressive strength to flexural strength.Analysis indicated that the optimum amount of reticulate polypropylene fabric to be used in concrete is 0.9㎏per cubic meter of concrete,and PAM is 8% of the cement weight.

关 键 词：聚丙烯纤维网 聚丙烯酰胺 微观结构 弯曲韧性 压折比 

分 类 号：TU279.71[建筑科学—建筑设计及理论]