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工程科学与技术:2016,48(Z1):128-134
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改善新老混凝土界面粘结性能的措施研究
(1.四川大学建筑与环境学院;2.四川大学建环学院)
Experimental study on the methods to improve interfacial bonding behavior between existing concrete and attached concrete
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投稿时间:2015-09-03    修订日期:2016-01-06
中文摘要: 通过16组共48个100mm×100mm×100mm四种纤维混凝土与既有混凝土粘结的立方体试件劈拉试验,研究了新混凝土中纤维种类、纤维掺量对粘结试件劈拉性能的影响。结果表明各种纤维的加入总体上均有利于新老混凝土粘结性能的提高。效果最佳的是碳纳米管,其次是聚丙烯腈纤维,然后是玄武岩纤维和钢纤维。然后通过64组共192个100mm×100mm×100mm纤维增强聚合物改性混凝土与既有混凝土粘结的立方体试件劈拉试验,研究了新混凝土中纤维种类、纤维与聚合物掺量组合对粘结试件劈拉性能的影响。苯丙乳液的复合掺入总体上可进一步提高新老混凝土的粘结劈拉强度。各种纤维与苯丙乳液复掺时,均存在一个苯丙乳液掺量的最佳值。
Abstract:Splitting testings on 48 100mm×100mm×100mm concrete specimens combined by two parts were conducted to figure out efficient methods to improve the interfacial bonding behavior between existing concrete and attached concrete during retrofitting. The attaching concrete was incorporated with 4 different kinds of fibers, which were stell fiber, polyacrylonitrile fiber, basalt fiber and carbon nano-tube. The effects on bonding behavior due to different fiber and proportion were investigated to find out the best one. It was showed that the bonding behavior was improved when the attaching concrete incorporated with fiber. Those incorporated with carbon nano-tube performed best, the following one was polyacrylonitrile fiber, and then basalt fiber and steel fiber in order. Furthermore, splitting testings on 192 extra specimens, in which the attaching parts were incorporated with fiber and styrene-acrylic emulsion, were carried out to study the interfacing bonding behavior. The effects due to different fibers, content of styrene-acrylic emulsion and proportion of fibers were evaluated according the testing results. Anyway, incorporating styrene-acrylic emulsion to the attached concrete generally showed better performance than those without styrene-acrylic emulsion. The best content proportion for both fibers and styrene-acrylic emulsion was pointed out according to the testing results.
文章编号:201500908     中图分类号:    文献标志码:
基金项目:省学术带头人培养基金(川人[2015]100-1);四川省应用基础计划(2014JY0186)
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朱亚阁,李碧雄,蒲养林.改善新老混凝土界面粘结性能的措施研究[J].工程科学与技术,2016,48(Z1):128-134.
zhu ya ge,li bi xiong,pu yang lin.Experimental study on the methods to improve interfacial bonding behavior between existing concrete and attached concrete[J].Advanced Engineering Sciences,2016,48(Z1):128-134.