THE EARLY-AGE ANG LONG-TERM SHRINKAGE OF ULTRA-HIGH PERFORMANCE FIBER REINFORCED CONCRETE (UHPFRC)

摘要：

　　The early-age and long-term shrinkage of steam curing ultra-high performance fiber reinforced concrete (UHPFRC) was investigated.Fly ash and slag was used and the effect of mineral admixtures on the early-age and long-term shrinkage of UHPFRC was clarified.The effect of Shrinkage reducing agent and expanding agent on the early-age and long-term shrinkage of UHPFRC was discussed.The results show that the total shrinkage up to 1800με of the early-age shrinkage of UHPFRC could be divided into 5 parts.The long-term shrinkage in 7d to 60d was only 150με, and the swell was about 220με till 180d.UHPFRC with steam curing presents remarkable volume stability.The early-age shrinkage of UHPFRC was remarkably restrained by fly ash, slag, shrinkage reducing agent and expanding agent.For the long-term shrinkage and swell, slag presents better restraining effect than fly ash.The overdose of expanding agent might sharply increase the plastic shrinkage of UHPFRC at initial hydration time, which requires special attention.

关键词： UHPFRC Shrinkage Mineral admixture Shrinkage reducer Expanding agent

作者: Shikun Zhao Song Han Mingzhe An Hong Zhang Tian Zhang

作者单位: School of Civil Engineering, Beijing Jiaotong University, China

会议类型: 国际会议

会议名称: The 2nd International Conference on UHPC Materials and Structures, UHPC2018-China(第二届超高性能混凝土材料和结构国际会议)

会议地点: 福州

会议语种:英文

页码: 526-536

在线出版日期: 2018-11-07（万方平台首次上网日期，不代表论文的发表时间）