混杂纤维增强再生混凝土性能的试验研究  

Experimental Study on the Performance of Hybrid Fiber Reinforced Recycled Concrete

作　　者：董芳菲[1] 徐晋[2] DONG Fang-fei;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：《混凝土与水泥制品》2020年第8期48-51,共4页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51178388);陕西省教育厅重点实验室科研计划项目(11JS059、12JS055)。

摘　　要：试验研究了不同煅烧高岭土取代率下纤维混掺比例(mPVA∶mBF∶mSF)对再生混凝土(RAC)抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明,随着煅烧高岭土取代率的增加,混杂纤维RAC的立方体抗压强度呈先增加后减小趋势,且当煅烧高岭土取代率为20%时达到最大值。各煅烧高岭土取代率下不同混掺比例的纤维对RAC劈裂抗拉强度和抗折强度的补强效果顺序为:(mPVA∶mBF∶mSF=1∶1∶8)>(mPVA∶mBF∶mSF=2∶2∶6)>(mPVA∶mBF∶mSF=3∶3∶4),且均高于基准组。钢纤维占比越大,煅烧高岭土和混杂纤维的协同作用对RAC抗压强度、劈裂抗拉强度、抗折强度的补强效果越好。The effects of fiber blending ratio(mPVA∶mBF∶mSF)on the compressive strength,splitting tensile strength and flexural strength of recycled concrete(RAC)were studied under different replacement ratio of calcined kaolin.The results show that the cube compressive strength of hybrid fiber RAC increases first and then decreases with the increase of the replacement rate of calcined kaolin,and reaches the maximum value when the replacement rate of calcined kaolin is 20%.The reinforcement effects of fibers with different blending ratios on the splitting tensile strength and flexural strength of RAC are as follows:(mPVA∶mBF∶mSF=1∶1∶8)>(mPVA∶mBF∶mSF=2∶2∶6)>(mPVA∶mBF∶mSF=3∶3∶4),which is higher than that of the reference group.The larger the proportion of steel fiber,the better the synergistic effect of calcined kaolin and hybrid fiber on RAC compressive strength,splitting tensile strength and flexural strength.

关 键 词：再生混凝土(RAC) PVA纤维 玄武岩纤维(BF) 钢纤维(SF) 煅烧高岭土 力学性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]