钢纤维-偏高岭土交互作用下对RAC性能增强试验研究  

Experimental study on the enhancement of RAC properties by steel fiber metakaolin interaction

作　　者：田呈林 徐晋[2] TIAN Chenglin;XU Jin(College of Civil Engineering,Xijing University,Xi′an 710123,China;College of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西京学院土木工程学院,陕西西安710123 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《混凝土》2021年第6期19-22,共4页Concrete

基　　金：国家自然科学基金资助项目(51178388)。

摘　　要：为了研究钢纤维和偏高岭土交互作用下RAC抗压强度与劈裂抗拉强度的影响,对OPC组、S-MK组、S-MK5%组、S-MK10%组、S-MK15%组、S-MK20%组、S-MK25%组7组共42块RAC进行抗压、劈裂抗拉、延展性、偏高岭土取代率与立方体抗压强度和劈裂抗拉强度之间关系对比性研究,研究表明:单掺钢纤维时,S-MK组相比于OPC组,抗压强度和劈裂抗拉强度均有所增加,分别增加了13.17、0.53 MPa;钢纤维和偏高岭土的交互作用下立方体抗压强度和劈裂抗拉强度两者均随着偏高岭土取代率增加呈现先增加后减小趋势,其中S-MK15%组增强效果最为明显;二次多项式对偏高岭土取代率与立方体抗压强度、劈裂抗拉强度之间关系拟合结果精度较高;钢纤维和偏高岭土的交互作用下,在偏高岭土取代率15%时S-MK15%组压拉比达到最小值,表现出良好的延展性,当取代率大于15%时,压拉比有所增加。In order to study the influence of steel fiber and metakaolin interaction on the compressive strength and splitting tensile strength of RAC,the relationship between compressive strength,splitting tensile strength,ductility,metakaolin substitution rate and cube compressive strength and splitting tensile strength of RAC in OPC group,S-MK group,S-MK5%group,S-MK10%group,S-MK15%group,S-MK20%group and S-MK25%group were studied.The results showed that compared with OPC group,the compressive strength and splitting tensile strength of S-MK group increased by 13.17 MPa and 0.53 MPa,respectively.The cube compressive strength and splitting tensile strength under the interaction of steel fiber and metakaolin increased at first and then decreased with the increase of metakaolin substitution rate,and the strengthening effect of S-MK15%group was the most obvious.The results show that the accuracy of fitting the relationship between metakaolin substitution rate and cube compressive strength,splitting tensile strength is high.Under the interaction of steel fiber and metakaolin,the compression draw ratio of S-MK15%group reaches the minimum when the partial kaolin replacement rate is 15%,showing good ductility.When the substitution rate is greater than 15%,the compression drawing ratio increases.

关 键 词：RAC 抗压强度 劈裂抗拉强度 延展性 

分 类 号：TU528.572[建筑科学—建筑技术科学]