Study on tensile properties and deterioration mechanism of PE-ECC under coupling attack of freeze-thaw cycle and sulfate-chloride

doi:10.19936/j.cnki.2096-8000.20241028.005

Abstract

Abstract: In order to study the tensile properties of polyethylene fiber engineered cementitious composites(PE-ECC) under coupling attack of freeze-thaw cycle and sulfate-chloride, two kinds of environments, pure water and sulfate-chloridesolution (5% Na₂SO₄+3.5% NaCl), were set up, and the axial tensile tests were carried out after 0, 50, 100, 150, and 200 freeze-thaw cycles, respectively. The test results showed that the damage degree of the specimens in both environments increased with the freeze-thaw cycles, but the degree of surface spalling was more serious and the deformation performance was lower in the sulfate-chloride environment under the same freeze-thaw cycles, but the ultimate strains could all achieve above 2%. On this basis, the micro-mechanism of deterioration of PE-ECC tensile property was investigated by XRD, SEM, EDS energy spectrum analysis, NMR and other techniques. The results show that swelling hydration products such as brucite, gypsum and ettringite produced by sulfate-chloride erosion cause pores and micro-cracks to develop, which work together with the freezing of water in the pores, aggravates the damage of the internal structure.

Key words: compound salt freeze, polyethylene fiber engineered cementitious composites (PE-ECC), tensile properties, microscopic mechanism

CLC Number:

TB332

ZHENG Yi, CHEN Zhongshu, ZHANG Jin, ZHANG Yaoting. Study on tensile properties and deterioration mechanism of PE-ECC under coupling attack of freeze-thaw cycle and sulfate-chloride[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(10): 32-39.

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