细集料种类和钢纤维对CA-UHPC力学性能的影响  

Effects of fine aggregate type and steel fiber on themechanical properties of CA-UHPC

作　　者：余志辉 吴立山 张聪[1,2] YU Zhihui;WU Lishan;ZHANG Cong(School of Environment and Civil Engineering,Jiangnan University,Wuxi 214000,China;Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,Xuzhou 221000,China)

机构地区：[1]江南大学环境与土木工程学院,无锡江苏214000 [2]江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221000

出　　处：《功能材料》2021年第12期12152-12158,12164,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(51908247);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(YA-616)。

摘　　要：研究了河砂、石英砂、机制砂作为细集料以及不同的钢纤维长径比(13/0.2,15/0.2,25/0.3)、不同钢纤维掺量(0%,1.5%,2%)和钢纤维混杂(13 mm+25 mm)对于含粗骨料超高性能混凝土(CA-UHPC)力学性能的影响。结果表明,细集料的粒径分布对CA-UHPC的抗压强度影响显著,对于其抗弯强度影响较小,其中机制砂CA-UHPC的抗压强度和抗弯强度均最高。在钢纤维掺量不超过2%的范围内,CA-UHPC的抗压强度与钢纤维掺量、长径比、杂化均呈正相关;CA-UHPC的抗弯强度随着钢纤维掺量的增加而增加,随着钢纤维长径比的增加而先增加后下降;钢纤维复掺有利于抗弯强度的提升。此外,碳酸钙晶须等体积替代钢纤维时,CA-UHPC的抗压强度和抗弯强度会下降。In this paper,the effects of river sand,quartz sand,machine-made sand as fine aggregate,different length-diameter ratio of steel fiber(13/0.2,15/0.2,25/0.3),different steel fiber content(0%,1.5%,2%)and steel fiber mixture(13 mm+25 mm)on the mechanical properties of ultra-high performance concrete containing coarse aggregate(CA-UHPC)are studied.The results show that the particle size distribution of fine aggregate has a significant effect on the compressive strength of CA-UHPC,but a small effect on the flexural strength of CA-UHPC,in which the compressive strength and flexural strength of manufactured sand CA-UHPC are the highest.When the content of steel fiber is less than 2%,the compressive strength of CA-UHPC is positively correlated with the content of steel fiber,length-diameter ratio and hybridization.The flexural strength of CA-UHPC increases with the increase of steel fiber content,and increases first and then decreases with the increase of steel fiber aspect ratio.The composite mixing of steel fiber is beneficial to the improvement of flexural strength.In addition,the compressive strength and flexural strength of CA-UHPC decrease when steel fiber is replaced by CaCO_(3) whisker of equal volume.

关 键 词：细集料 钢纤维 碳酸钙晶须 超高性能混凝土 力学性能 

分 类 号：TU502[建筑科学—建筑技术科学]