纤维增强的再生微粉混凝土工作性及抗压性能试验研究  

Experimental study on workability and compressive properties of fiber reinforced recycled powder concrete

作　　者：郭强[1] 李秀领[2] 王帅[1] 杨冠杰 王健[1] 吕相蓉 尚文涛 GUO Qiang;LI Xiuling;WANG Shuai;YANG Guanjie;WANG Jian;LüXiangrong;SHANG Wentao(The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan 250000,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]中建八局第二建设有限公司,山东济南250000 [2]山东建筑大学土木工程学院,山东济南250101

出　　处：《混凝土》2022年第3期109-112,共4页Concrete

基　　金：国家自然科学基金面上项目(51278290);山东省自然科学基金项目(ZR2020ME245);中国地震局工程力学研究所实验室开放课题(2019D10)。

摘　　要：以再生微粉混凝土为研究对象,探究了PVA纤维掺量、水胶比、砂胶比、再生微粉替代率、减水剂掺量等因素对再生微粉混凝土工作性及抗压性能的影响规律。研究表明,随PVA掺量、再生微粉掺量增加,拌合物流动度降低;当水胶比为0.24和0.28时拌合物保水性较好;再生微粉吸水率较高,使得流动性降低,即使添加过量减水剂也会出现泌水现象;各因素对再生微粉混凝土28 d抗压强度影响的主次顺序是水胶比>减水剂>再生微粉掺量>砂胶比>PVA纤维掺量;再生微粉掺量在25%时试件抗压强度最高。In order to realize the resource utilization of building solid waste,this paper takes recycled powder as research object,and explores the mixing amount of PVA fiber,water-binder ratio,sand-binder ratio,replacement rate of recycled powder,water reducing agent dosage on the workability and compressive performance of recycled powder concrete.The results show that the fluidity of the mixture will decrease with the increase of PVA content and recycled powder content.When the water-binder ratio was 0.24 and 0.28,the mixture had good water retention.The high-water absorption rate of recycled powder reduced the fluidity.Even if excessive water reducer was added,bleeding phenomenon also appear.The order of influence of various factors on the 28 d compressive strength of recycled powder concrete from high to low is water-binder ratio,water reducing agent,reclaimed micro-powder ratio,sand binder ratio and PVA fiber content.When the recycled powder content was 25%,the specimen showed higher compressive strength.

关 键 词：PVA纤维 再生微粉混凝土 工作性 抗压强度 水胶比 

分 类 号：TU528.041[建筑科学—建筑技术科学]