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Performance of carbonated calcium silicate based cement pastes and mortars exposed to NaCl and MgCl2 deicing salt
Journal article   Peer reviewed

Performance of carbonated calcium silicate based cement pastes and mortars exposed to NaCl and MgCl2 deicing salt

Yaghoob Farnam, Chiara Villani, Taylor Washington, Mark Spence, Jitendra Jain and W. Jason Weiss
Construction & building materials, v 111
15 May 2016
DOI: https://doi.org/10.1016/j.conbuildmat.2016.02.098
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Carbonated calcium silicate concrete Deicing salt Freeze–thaw Magnesium chloride Reactivity Sodium chloride
•Calcium silicate cement reacts with CO2 and gains strength through carbonation.•CCSC shows less freeze–thaw damage than OPC.•CCSC is more resistance to salt degradation than OPC. This paper investigates the performance of two cementitious systems exposed to freezing or deicing salts. The first cementitious system is made using an ordinary portland cement (OPC) that reacts through hydration. The second cementitious system is made using a calcium silicate cement (CSC) that reacts and gains strength through carbonation (i.e., carbonated calcium silicate based cement (CCSC)). Two experimental techniques were used to evaluate the performance of these materials. The first technique measures the potential reactivity between the concrete paste and the deicing salt (NaCl and MgCl2) using a low temperature differential scanning calorimeter. The second technique uses a longitudinal guarded comparative calorimeter equipped with acoustic emission to assess the freeze–thaw performance of mortar samples saturated with water or deicing solutions. No chemical reaction is observed between CCSC paste and NaCl while a damaging reaction is observed between the OPC paste and NaCl due to the presence of calcium sulfoaluminate phases. A chemical reaction occurs for both the CCSC and OPC paste exposed to MgCl2: for the CCSC paste, this appears non-deleterious since relatively no reduction in dynamic elastic modulus is observed; for OPC paste, however, this is a damaging reaction due to formations of magnesium silicate hydrate and calcium/magnesium oxychloride. CCSC mortar sample saturated with water shows freezing in the large pores at approximately −5°C and smaller pores at approximately −28°C. Both the OPC and CCSC mortars show similar freeze–thaw performance when the system is water saturated. When the water in the pores of the mortar is replaced with a salt solution (NaCl and MgCl2), the CCSC mortar shows less freeze–thaw damage (mainly due to possessing a different pore structure) and more resistance to salt degradation (mainly due to possessing a different chemistry) than the OPC mortar does.

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45 citations in Web of Science
56 citations in Scopus

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UN Sustainable Development Goals (SDGs)

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#12 Responsible Consumption & Production

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Collaboration types
Industry collaboration
Domestic collaboration
Web of Science research areas
Construction & Building Technology
Engineering, Civil
Materials Science, Multidisciplinary
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