会议专题

CONCRETE SORPTIVITY AS A PERFORMANCE-BASED CRITERION FOR SALT FROST SCALING RESISTANCE

  Due to the resource-intensive process of conducting salt frost scaling test there is a strong interest in performance-based criteria tests that are indicative of frost resistance as these tests, although not as a replacement for scaling measurement, are intended to establish material level improvements.Previous studies have shown cryogenic capillary suction is a major liquid transport mechanism during salt/F-T exposure.The intrinsic suction rate of concrete surface region is mainly controlled by the paste pore structure.In this paper, Sellevolds model on concrete sorptivity is extended to incorporate the pore size distribution by aggregating capillary pores into clusters of straight circular tubes of different sizes.This refined methodology shows the strong dependency of sorptivity on the pore volume and its size distribution and holds the potential to model pore shape and continuity effects.This model elucidates the effective measures to mitigate salt frost scaling: reduction in water binder (w/b) ratio or partial replacement of Portland cement by slag cement.

Zhichao Liu Will Hansen Ya Wei

Department of Civil and Environmental Engineering,University of Michigan,USA Department of Civil Engineering,Tsinghua University,China

国际会议

The Fourth RILEM International Symposium on Concrete Modelling (CONMOD 2014)(第四届RILEM混凝土材料建模国际会议)

北京

英文

487-496

2014-10-12(万方平台首次上网日期,不代表论文的发表时间)