摘要
通过聚丙烯纤维锂渣混凝土试件的中心拉拔试验,试验中聚丙烯纤维掺量分别为0、0.6、0.9、1.2、1.5 kg/m^3,锂渣替代水泥(质量百分数分别为0%、10%、20%、30%),共20组60个尺寸为150 mm的立方体拉拔试件。研究聚丙烯纤维锂渣混凝土与HRB500钢筋的黏结性能,分析聚丙烯纤维掺量和锂渣掺量对黏结性能的影响,并探索拉拔试件模具的制作方法。结果表明:聚丙烯纤维掺量与极限黏结强度大致成正比;随着锂渣掺量的增大,极限黏结强度呈"减小-增大-减小"的走势,锂渣掺量为20%时达到最大值;纤维掺量为0.9 kg/m^3、锂渣掺量为20%时为较优配合比,比无锂渣无纤维试件的极限黏结强度提高了32.7%。
In order to study the bond properties between polypropylene fiber-lithium slag reinforced concrete and HRB500 steel bar,the effects of polypropylene fiber content and lithium slag content were analyzed through the pull-out experiments on specimens with polypropylene fibers and lithium slag. In this experiment,there were a total of 20 groups of 60 pull-out specimens which drawing sizes were all 150 mm cube（ mm^3）,and polypropylene fiber contents were0,0.6,0.9,1.2,1.5 kg / m^3,and lithium slag quality percentages to replace cement were 0%,10%,20%,30%,respectively. At the same time,the method of making specimen mold was explored in order to satisfy the requirement of different sizes of specimens,to realize the convenience of mould dismantling and assembling,and to reuse pull-out specimens mold. Results of experiment showed that the polypropylene fiber content is roughly proportional to the ultimate bond strength. The ultimate bond stress is ＂decrease-increase-decrease＂with the increase of lithium slag content,and the ultimate bond stress was up to its maximum when the lithium slag content reached 20 % of the cement. The content of polypropylene fiber played more important role than the content of lithium slag in improving the ultimate bond stress.The better mix proportions are that the polypropylene fiber content is 0. 9 kg / m3 and the lithium slag content is 20 %.When compared to normal concrete,the ultimate bond stress is increased by 32. 7 %,and the results can provide a reference to engineering application for polypropylene fiber-lithium slag reinforced concrete.
出处
《实验室研究与探索》
CAS
北大核心
2016年第10期7-11,共5页
Research and Exploration In Laboratory
基金
国家自然科学基金资助项目(51568064)
新疆维吾尔自治区自然科学基金资助项目(2014211A006)
新疆维吾尔自治区<混凝土结构设计原理>精品课程
关键词
聚丙烯纤维锂渣混凝土
HRB500钢筋
黏结性能
拉拔试件模具
polypropylene fiber-lithium slag reinforced concrete
HRB500 steel bar
bond property
pull-out specimens mold
