陶砂替代石英砂制备活性粉末混凝土(RPC)的性能研究  

Performance of Reactive Powder Concrete(RPC)Prepared by Ceramic Sand Instead of Quartz Sand

作　　者：朱博 段锋[1] 何娟 史琛[1] 刘文欢[1] ZHU Bo;DUAN Feng;HE Juan;SHI Chen;LIU Wenhuan(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《材料导报》2022年第10期65-69,共5页Materials Reports

基　　金：陕西省科技攻关项目(2018SF-367)。

摘　　要：活性粉末混凝土(RPC)具有高强度及高韧性,但其自重较大,限制了其在城市交通轨道领域中的应用。为了降低RPC容重,本工作采用轻质高强陶砂替代石英砂制备RPC,分析了陶砂替代率对其流动性、干表观密度、力学性能和显微结构的影响。结果表明:当陶砂替代率为30%时,试样抗压强度为120.1 MPa,抗折强度为27.0 MPa,可满足地铁疏散平台、盖板等交通轨道领域内RPC的力学性能要求,此时陶砂RPC干表观密度为2338 kg/m^(3),与基准试样相比降低了12.1%,同时其拌合物流动性能显著提升,并具有良好的韧性;钢纤维、陶砂与RPC基体结合紧密,且陶砂和RPC基体具有良好的界面过渡区。Reactive powder concrete(RPC)has high strength and high toughness,but its high weight limits its application in the field of urban transportation.In order to reduce its bulk density,lightweight and high-strength ceramic sand was used to replace the quartz sand in RPC,and its fluidity,apparent dry density,mechanical properties and microstructure were studied.The results show that the compressive strength of the specimen is 120.1 MPa and the flexural strength is 27.0 MPa when the replacement rate of ceramic sand is 30%,which can meet the mechanical performance requirements of RPC in the field of subway evacuation platforms and cover plates.The apparent dry density of ceramic sand RPC is 2338 kg/m^(3),which is reduced by 12.1%,compared with the RPC without ceramic sand.At the same time,the flow property is significantly improved,and it has good toughness.The steel fiber,ceramic sand and RPC matrix are combined closely,and ceramic sand and RPC matrix have a good interface transition zone.

关 键 词：活性粉末混凝土 陶砂 力学性能 疏散平台 

分 类 号：TU528.31[建筑科学—建筑技术科学]