Experimental investigation on chloride penetration and mechanical characteristics in early age cement-based materials under salt freeze-thaw conditions
Source abstract
Abstract
ABSTRACT Considering the chloride permeability and mechanical characteristics of cement-based materials in cold marine environment are significantly affected by coupling action of freezing and thawing cycles as well as chloride penetration during early curing phase, a serial of experimental measurements were conducted to study the influence degree of curing age and salt freeze-thaw (SFT) environment on chloride permeability as well as mechanical characteristics of early age cement-based materials in present study. Firstly, salt freeze-thaw tests were conducted after representative curing age, i.e., 3, 7, 14, and 28 days. Then experimental tests for chloride permeability and mechanical characteristics were conducted after certain number of SFT cycles to determine the chloride concentration, compression strength, mass loss, and the relative dynamic elastic modulus (RDEM). Experimental results showed that with the decrease of curing age, both chloride permeability and mechanical characteristics degenerate apparently. Meanwhile a noticeable effect of curing age on cement-based materials suffered from SFT environment was detected: chloride diffusion coefficient, compression strength and RDEM of specimens after early curing age firstly increase slightly and then decrease dramatically. This study confirmed that early curing age play a critical role in chloride permeability and mechanical characteristics of cement-based materials subjected to SFT environment.
Source: crossref · Quality: baseline
Affiliations
Jinling Institute of Technology, China
Hohai University, China
Funding
Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Important Science & Technology Foundation of China Oilfield Service Limited, CNOOC
References (46)
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