钢渣粉和膨胀剂对超高性能混凝土（UHPC）性能的影响：基于一个案例研究

Effects of Steel Slag Powder and Expansive Agent on the Properties of Ultra-High Performance Concrete (UHPC): Based on a Case Study.

作者信息

Li Shunkai, Cheng Shukai, Mo Liwu, Deng Min

机构信息

College of Materials Science and Engineering, Nanjing Tech University, Nanjing 21009, China.

CCCC Wuhan Harbor Engineering Design & Research Institute Co., LTD, Wuhan 430000, China.

出版信息

Materials (Basel). 2020 Feb 3;13(3):683. doi: 10.3390/ma13030683.

DOI:10.3390/ma13030683

PMID:32028705

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7040848/

Abstract

In view of the performance requirements of mass ultra-high performance concrete (UHPC) for the Pang Gong bridge steel cable tower in China, the UHPC incorporating of steel slag powder and hybrid expansive agents is optimized and prepared. The effects of steel slag powder and hybrid expansive agents on the hydration characteristics and persistent shrinkage of UHPC are investigated. The results indicate that 15 wt.% steel slag powder and 5 wt.% hybrid expansive agents can effectively reduce the drying shrinkage deformation of UHPC with a slight decrease of strength. Heat flow calorimetry results show that the incorporation of steel slag powder and expansive agents decreases the hydration heat at three days. Moreover, the obtained adiabatic temperature rise of UHPC is 59.5 °C and the total shrinkage value at 180 days is 286 με. The hydration heat release changes of large volume UHPC in the steel-concrete section of cable tower is agreed with the result of adiabatic temperature rise in the laboratory.

摘要

针对中国庞公大桥钢索塔对大掺量超高性能混凝土（UHPC）的性能要求，对掺钢渣粉和复合膨胀剂的UHPC进行了优化配制。研究了钢渣粉和复合膨胀剂对UHPC水化特性及持续收缩的影响。结果表明，15 wt.%的钢渣粉和5 wt.%的复合膨胀剂能有效降低UHPC的干燥收缩变形，强度略有降低。热流 calorimetry 结果表明，钢渣粉和膨胀剂的掺入降低了3天的水化热。此外，所测UHPC的绝热温升为59.5℃，180天的总收缩值为286με。索塔钢混结合段大体积UHPC的水化热释放变化与实验室绝热温升结果相符。