摘要
We developed ultra-high performance concrete(UHPC)incorporating mullite sand and brown corundum sand(BCS),and the quartz sand UHPC was utilized to prepare for comparison.The properties of compressive strength,elastic modulus,ultrasonic pulse velocity,flexural strength,and toughness were investigated.Scanning electron microscopy and nanoindentation were also conducted to reveal the underlying mechanisms affecting macroscopic performance.Due to the superior interface bonding properties between mullite sand and matrix,the compressive strength and flexural toughness of UHPC have been significantly improved.Mullite sand and BCS aggregates have higher stiffness than quartz sand,contributing to the excellent elastic modulus exhibited by UHPC.The stiffness and volume of aggregates have a more significant impact on the elastic modulus of UHPC than interface performance,and the latter contributes more to the strength of UHPC.This study will provide a reference for developing UHPC with superior elastic modulus for structural engineering.
作者
丁庆军
ZHOU Changsheng
张高展
GUO Hong
LI Yang
ZHANG Yongyuan
GUO Kaizheng
DING Qingjun;ZHOU Changsheng;ZHANG Gaozhan;GUO Hong;LI Yang;ZHANG Yongyuan;GUO Kaizheng(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Advanced Building Materials Key Laboratory of Anhui Province,School of Material Science and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China;China Railway 17th Bureau Group Co.,Ltd.Taiyuan 030006,China)
基金
Funed by the National Natural Science Foundation of China(No.U21A20149)
the Ecological Environment Scientific Research Project of Anhui Province(No.2023hb0014)
the Research Reserve of Anhui Jianzhu University(No.2022XMK01)
the Excellent Scientific Research and Innovation Team in Colleges and Universities of Anhui Province(No.2022AH010017)
Research on the preparation technology of self compacting concrete with strength grade C100.
