摘要
对混杂纤维(玄武岩纤维、聚乙烯醇纤维)再生微粉混凝土进行四点弯曲试验和快速碳化试验,研究单、复掺纤维、水胶比及再生微粉掺量对纤维再生微粉混凝土弯曲性能及抗碳化性能的影响。研究结果表明,试件抗弯强度、抗碳化性能随水胶比、再生微粉替代率增加而降低;玄武岩纤维的掺加有利于提高混凝土的初裂荷载、抗碳化性能,PVA纤维的掺入可增强混凝土韧性;水胶比为0.28、再生微粉掺量为45%,玄武岩纤维和聚乙烯醇纤维掺量分别为0.2%、1.7%复掺时,混凝土弯曲韧性最佳,但抗碳化性能较差。
A four point bending test and a rapid carbonization test were carried out on the mixed fiber(basalt fiber and polyvinyl alcohol fiber)reclaimed powder concrete.The effects of single fiber or composite fiber,water-binder ratio and the amount of recycled powder on the flexural properties and carbonation resistance of fiber recycled micropowder concrete were studied.The results show that with the increase of water-binder ratio and the replacement rate of recycled micro powder,the bending strength and carbonization resistance of the test block gradually decrease.The addition of BF fiber can improve the crack resistance and carbonation resistance of concrete,and the addition of PVA fiber can toughen concrete.When the water binder ratio is 0.28,the content of recycled micro powder is 45%,and the content of basalt fiber and polyvinyl alcohol fiber are 0.2%and 1.7%respectively,the flexural toughness of concrete is the best,while the carbonation resistance is poor.
作者
李珊珊
李秀领
郭强
陈柯臻
吴睿
孙广
LI Shanshan;LI Xiuling;GUO Qiang;CHEN Kezhen;WU Rui;SUN Guang(School of Civil Engineering,Ministry of Education,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Ministry of Education,Shandong Jianzhu University,Jinan 250101,China;The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan 250000,China;China Construction Second Engineering Bureau Ltd.,Beijing 100000,China)
出处
《混凝土》
CAS
北大核心
2023年第5期108-112,共5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(ZR2020ME245)
中国地震局工程力学研究所实验室开放课题(2019D10)。
关键词
再生微粉
混杂纤维
四点弯曲试验
弯曲韧性
碳化深度
recycled powder
hybrid fiber
four point bending test
bending toughness
carbonation depth
