聚丙烯纤维锂渣混凝土与HRB500钢筋的黏结特性  

Bonding characteristics between polypropylene fiber lithium slag concrete and HRB500 reinforcement

作　　者：张广泰[1,2] 李瑞祥 令芳 刘诗拓 陈勇 ZHANG Guangtai;LI Ruixiang;LING Fang;LIU Shituo;CHEN Yong(College of Architecture and Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Building Structure and Seismic Laboratory,Urumqi 830047,China;College of Civil Engineering,Xinjiang Institute Engineering,Urumqi 830023,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047 [2]新疆建筑结构与抗震重点实验室,新疆乌鲁木齐830047 [3]新疆工程学院土木工程学院,新疆乌鲁木齐830023

出　　处：《混凝土》2022年第4期1-7,共7页Concrete

基　　金：国家自然科学基金项目(51968070)。

摘　　要：为研究聚丙烯纤维锂渣混凝土与HRB500钢筋的黏结特性,以聚丙烯纤维掺量(0、0.6、0.9、1.2、1.5 kg/m^(3))和锂渣取代水泥量(0、20%)为变量,通过中心拉拔试验研究了聚丙烯纤维掺量与锂渣取代量对黏结性能的影响。基于Tepfers黏结强度理论,结合试验结果,考虑纤维对黏结强度的影响,提出未配箍筋的纤维混凝土黏结强度理论分析模型。结果表明:锂渣取代水泥量为20%的试件,其极限黏结强度较普通混凝土提高21.9%,峰值滑移增大4.0%;随着聚丙烯纤维掺量的增加,聚丙烯纤维锂渣混凝土试件的极限黏结强度先提高后降低,当聚丙烯纤维掺量为0.9 kg/m^(3)时达到最大,极限黏结强度较普通混凝土试件提高33.1%,峰值滑移降低7.9%。将试验结果与目前国内外广泛应用的BPE模型、XU模型和CMR模型进行对比分析,提出适用于聚丙烯纤维锂渣混凝土与HRB500钢筋的黏结滑移本构模型。In order to study the bonding properties of polypropylene fiber lithium slag concrete and HRB500 steel bars,the mass content of polypropylene fiber(0,0.6,0.9,1.2,1.5 kg/m^(3))and the amount of lithium slag(0,20%)is a variable,and the effects of the mass of polypropylene fiber and the amount of lithium slag on the bonding performance were studied through a central pull test.Based on the bond strength theory of common specimens,combined with the bond slip test results,and considering the influence of fibers on bond strength,a theoretical analysis model of bond strength of fiber reinforced concrete without stirrups is proposed.The results show that the ultimate bond strength and peak slip of the specimen with 20%lithium slag instead of cement are increased by 21.9%and 4.0%respectively which indicates that the ductility is improved.With the increase of polypropylene fiber content,the ultimate bond strength of polypropylene fiber lithium slag concrete specimen first increased and then decreased,and reached the maximum when the polypropylene fiber content was 0.9 kg/m^(3).Compared with ordinary concrete specimen,the ultimate bond strength increased by 33.1%and the peak slip decreased by 7.9%.Comparing the test results with BPE model,XU model and CMR model which are widely used at home and abroad at present,the key parameters under different models are obtained,and the bond-slip constitutive model suitable for polypropylene fiber lithium slag concrete and HRB500 steel bar is put forward.

关 键 词：聚丙烯纤维 锂渣 黏结滑移曲线 黏结强度 本构模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]