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Open AccessArticle

Freeze–Thaw Durability of Strain-Hardening Cement-Based Composites under Combined Flexural Load and Chloride Environment

1
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2
School of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1721; https://doi.org/10.3390/ma11091721
Received: 9 August 2018 / Revised: 5 September 2018 / Accepted: 9 September 2018 / Published: 14 September 2018
(This article belongs to the Special Issue Damage Detection and Characterization of High Performance Composites)
Cement-based materials are usually not exposed to an independent deterioration process but are exposed to a combination of mechanical load and environmental effects. This paper reports the frost resistance durability of strain-hardening cement-based composites (SHCC) under combined flexural loading at different levels and under chloride attack. The loss of mass, dynamic elastic modulus, and microstructure characteristics of SHCC specimens were determined, and the influence of loading level on frost resistance was analyzed. In addition, the effect of freeze–thaw action on the flexural performance and diffusion properties of chloride in SHCC under the combined loads was investigated. The results show that the process of degradation was accelerated due to the simultaneous action of flexural loading and freeze–thaw cycles in the chloride environment, and SHCC suffered more serious damage at a higher loading level. However, flexural strength decreased by only 13.87% after 300 freeze–thaw cycles at load level S = 0.36. The diffusion properties of chloride in SHCC under constant flexural loading were affected by the freezing and thawing cycle. The free chloride concentration Cf increased with the development of freezing and thawing at the same diffusion depth, and a bilinear relationship was found between the chloride diffusion coefficient Dc and the number of freeze–thaw cycles. View Full-Text
Keywords: strain-hardening cement-based composites (SHCC); freeze–thaw cycles; durability; flexural loading; chloride environment strain-hardening cement-based composites (SHCC); freeze–thaw cycles; durability; flexural loading; chloride environment
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MDPI and ACS Style

Yin, L.; Yan, C.; Liu, S. Freeze–Thaw Durability of Strain-Hardening Cement-Based Composites under Combined Flexural Load and Chloride Environment. Materials 2018, 11, 1721.

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