摘要
为了明晰硅灰和聚丙烯纤维对C30自密实混凝土抗压和劈裂强度的影响规律,用硅灰替代水泥质量的6%、9%、12%,并掺入体积分数分别为0.1%、0.2%、0.3%的聚丙烯纤维,对自密实混凝土展开力学性能改性试验研究。试验结果表明:3 d龄期混凝土的抗压强度和劈裂强度随硅灰掺量的增加呈先增后减趋势;纤维掺量为0.1%、0.2%、0.3%时,3 d和龄期混凝土的抗压强度均高于基准混凝土的抗压强度;纤维掺量为0.2%、硅灰替代率为9%时,28 d龄期混凝土的抗压强度和劈裂强度分别达到了最大值50.1 MPa和5.213 MPa。综合考虑C30自密实混凝土的抗压强度和劈裂强度,建议使用硅灰替代率为9%的水泥和掺量为0.2%的聚丙烯纤维进行自密实混凝土力学性能改性。
In order to clarify the influence of silica fume and polypropylene fibers on the compressive and splitting strength of C30 self-compacting concrete,experimental study on mechanical modification of self-compacting concrete by using silica fume to replace 6%,9%,12%of cement mass and mixing polypropylene fibers with volume fractions of 0.1%,0.2%,0.3%.The test results show that the compressive and splitting strength of the 3-day-age concrete increase first and then decrease with the increase of the amount of silica fume.When the fiber content is 0.1%,0.2%and 0.3%,the compressive strength of 3-day-age and 28-day-age concrete are higher than that of benchmark concrete.When the fiber content is 0.2%and the silica fume replacement rate is 9%,the compressive and splitting strength of the 28-day-age concrete reach the maximum value of 50.1 MPa and 5.213 MPa respectively.Considering the compressive and splitting strength of C30 self-compacting concrete,it is recommended to use 9%silica fume cement and 0.2%polypropylene fibers to modify the mechanical performance of self-compacting concrete.
作者
朱一丁
宋牧原
苟慧艳
李紫荆
王杰
ZHU Yiding;SONG Muyuan;GOU Huiyan;LI Zijing;WANG Jie(School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China;Ningxia Research Center of Technology on Water-Saving Irrigation and Water Resources Regulation, Yinchuan 750021, China;Engineering Research Center for Efficient Utilization of Water Resources in Modern Agriculture in Arid Regions, Yinchuan 750021, China)
出处
《中国科技论文》
CAS
北大核心
2020年第12期1401-1404,共4页
China Sciencepaper
基金
水利工程一流学科建设项目(NXYLXK2017A03)
宁夏高等学校科学研究项目(2018BEG02009)
宁夏自然科学基金资助项目(2019AAC03050)。
关键词
硅灰
聚丙烯纤维
自密实混凝土
抗压强度
劈裂强度
silica fume
polypropylene fiber
self-compacting concrete
compressive strength
splitting strength
