- 目录
- 混凝土与制品
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适合3D打印施工的超高性能混凝土研究
作者：孙振平1，2，孙远松1，2，3，庞敏1，2，赵一鹤1，2，徐月梅1，2，4，李欢欢1，2，4，徐亚玲4
（1.同济大学 材料科学与工程学院，上海 201804；2.同济大学 先进土木工程材料教育部重点实验室，上海 201804；3.成都宏基建材股份有限公司，四川 成都 610004；4.上海城建物资有限公司，上海 200063）
摘要：针对适合3D打印施工的超高性能混凝土（UHPC）的配制及性能进行了研究，研究了硅灰、粉煤灰和矿渣粉3种掺合料的掺量、砂胶比、水胶比对UHPC流动性和抗折、抗压强度的影响，以及钢纤维对UHPC强度和单轴拉伸性能的影响。结果表明：硅灰、粉煤灰、矿渣粉的掺量分别为5%、10%、10%，砂胶比为1∶0，水胶比为0.17时，制备的UHPC强度最高；当钢纤维体积掺量不小于2.0%时，UHPC的抗压强度>170.0 MPa，抗折强度>40.0 MPa，抗拉强度>10.0 MPa，且单轴受拉应力-应变曲线呈现出应变强化行为；当钢纤维体积掺量为2.5%时，UHPC的极限拉应变达6000×10-6。
关键词：3D打印混凝土；超高性能混凝土；拉伸性能；应变强化；极限拉应变
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2021）01-0001-05
Preparation of ultra high performance concrete for 3D printing construction
SUN Zhenping1，2，SUN Yuansong1，2，3，PANG Min1，2，ZHAO Yihe1，2，XU Yuemei1，2，4，LI Huanhuan1，2，4，XU Yaling4
（1.School of Materials Science and Engineering，Tongji University，Shanghai 201804，China；
2.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China；
3.Chengdu Hongji Building Materials Co. Ltd，Chengdu 610004，China；
2.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China；
3.Chengdu Hongji Building Materials Co. Ltd，Chengdu 610004，China；
4.Shanghai Urban Construction Material Co. Ltd.，Shanghai 200063，China）
Abstract：In this paper，the preparation and properties of ultra high performance concrete（UHPC） suitable for 3D printing construction are studied. The effects of three admixtures（silica fume，fly ash and slag powder），sand-cementitious ratio and water-cementitious ratio on the fluidity，flexural strength and compressive strength of UHPC，as well as the effects of steel fiber on the strength and uniaxial tensile properties of UHPC are emphatically tested. The results show that：when the dosage of silica fume，fly ash and slag powder is 5%，10% and 10% respectively，the sand-cementitious ratio is 1∶0 and the water-cementitious ratio is 0.17，the strength of UHPC prepared is the highest；when the volume content of steel fiber is not less than 2.0%，the compressive strength of UHPC is more than 170.0 MPa，the flexural strength is more than 40.0 MPa，and the flexural strength is more than 10.0 MPa，and the uniaxial tensile stress-strain curve shows strain strengthening behavior；when the volume content of steel fiber is 2.5%，the ultimate tensile strain of UHPC can reach 6000×10-6.
Key words：3D Printed concrete，UHPC，tensile properties，strain strengthening behavior，ultimate tensile strain