AIR VOID CHARACTERISTICS IN UHPC AND ITS RELATION TO SALT FROST DURABILITY

摘要：

　　UHPC mixes are non-air-entrained.However, air voids are still observed.This study visualize and quantify the air void characteristics in UHPC by the unit weight method on fresh mix and linear traverse method on hardened mix coupled with the stereo microscopic evaluation.Results indicate UHPC mixes normally have 4-7% air content in total and the air void profile resembles that in regular air-entrained concrete mixes.Air content needs to be renormalized for an accurate comparison between UHPC and regular concrete mixes having vastly different paste contents.The primary reason for the introduction of air voids in UHPC mixes is the excessive use of superplasticizer.Air content is found not to be the dominant factor in salt frost scaling in UHCP mixes.

关键词： UHPC Air void Salt scaling Mass loss

作者: Z.Liu X.Zhang F.Wang C.Hu Y.He Y.Zhang S.El-Tawil W.Hansen

作者单位: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, China; School of Materials and Chemical Engineering, Hubei University of Technology, China Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, USA

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: 518-525

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）