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

Author(s): Zhichao Liu, Will Hansen and Ya Wei
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 486-495
Total Pages: 10
Language: English

Abstract: 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, Sellevold’s 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 waterbinder (w/b) ratio or partial replacement of Portland cement by slag cement.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00