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Macroscopic properties evolution and microstructural analysis of early-age concrete in sulfate saline soil.

Authors :
Yang, Bo
Hu, Xiaopeng
Zhong, Shuai
Sun, Jiajia
Peng, Gang
Source :
Construction & Building Materials. Jun2024, Vol. 431, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

In more accurately simulating the degradation process of cast-in-place concrete structures in saline soil areas, this study prepared sulfate saline soil with varying sulfate concentrations. Experiments were conducted by casting concrete with different water-to-binder ratios and cement types into the saline soil. Through the analysis of macroscopic properties evolution and microstructure of early-age concrete, the study revealed the degradation mechanism of concrete in a sulfate saline soil environment. The investigation identified sulfate attack and leaching as the primary causes of early-age concrete degradation in sulfate saline soil. Notably, preparing concrete in saline soil exacerbated the degradation process. The macroscopic properties of some concrete begin to decrease as early as 1 day. The content of ettringite within concrete is gradually increasing and the content of portlandite is decreasing with age. At 28 days, the concrete corrosion interface displayed ettringite with varying widths and morphologies within pores and cracks, while the concrete surface layer exhibited micro-cracks and a porous surface. In addition, effective mitigation of early-age concrete degradation in saline soil can be achieved by controlling the water-to-binder ratio and utilizing cement with a lower tricalcium aluminate content. • The properties of early-age concrete in saline soil were methodically studied. • Sulfate attack and leaching are major causes of early-age concrete deterioration. • Lowering w / c or utilizing low C 3 A cement can ease early-age concrete deterioration. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09500618
Volume :
431
Database :
Academic Search Index
Journal :
Construction & Building Materials
Publication Type :
Academic Journal
Accession number :
177484320
Full Text :
https://doi.org/10.1016/j.conbuildmat.2024.136607