INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Environmental Adaptability of Epoxy Grouting Materials for Micro Cracks in Cast-in-place Cement Concrete for Bridge Deck |
LU Youfu1, WANG Chaohui2, WANG Xuecheng1, FAN Zhentong2, XIAO Xudang2
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1 Shandong Hi-Speed Group Co., Ltd, Jinan 250098, China 2 School of Highway, Chang’an University, Xi’an 710064, China |
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Abstract In order to determine the performance change of epoxy grouting materials for concrete micro cracks under extreme environmental conditions,four kinds of epoxy grouting materials (EP, EP/AD-Ⅰ, EP/AD-Ⅱ and EP/AD-Ⅲ) were prepared by using epoxy resin E-54, polyether amine D230 curing agent and three active diluents (AD-Ⅰ, AD-Ⅱ and AD-Ⅲ). The impact strength was used as the evaluation index to compare and analyze the flexibility of four kinds of epoxy grouting materials at room temperature and low temperature. Based on the tensile properties and interfacial bond strength of epoxy grouting materials, the evolution law of mechanical properties of different grouting materials under high temperature impact, temperature change and freeze-thaw cycles was explored. The results show that compared with pure epoxy grouting material, the reactive diluent weakens the low temperature flexibility, high temperature impact resistance, temperature denaturation resistance and frost resistance of epoxy grouting materials. Among them, AD-Ⅲ active diluent has the best effect on improving the toughness of epoxy grouting material at room temperature, but its impact toughness at -10 ℃ is 31.4% lower than that of pure epoxy grouting material. After high temperature impact, tempe-rature change treatment and freeze-thaw cycle, the tensile properties and bond strength of four kinds of epoxy grouting materials have different degrees of decline. Under high temperature impact, the bond strength of the four kinds of epoxy grouting materials lost greatly, with a decrease of 14.67%, but the bond strength was still higher than 2.5 MPa. During temperature change conditions, the bond strength of epoxy grouting materials decreases by 3.5%. The tensile properties of epoxy grouting materials are significantly affected by freeze-thaw cycles, but the tensile strength is still greater than 40 MPa, and the elongation at break is still higher than 4.0%.
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Published: 13 January 2022
Online: 2022-01-13
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Fund:This work was financially supported by Science and Technology Project of Shandong Transportation Department (2018B50) and Key Research and Development Projects in Shaanxi Province (2021GY-206). |
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