水性环氧树脂改性高早强砂浆的耐温机制

doi:10.13229/j.cnki.jdxbgxb.20231161

摘要/Abstract

摘要：

为探究高温对水性环氧树脂（WER）改性水泥砂浆的影响，本文对经不同温度（25、100、150、200和300 ℃）处理、不同WER掺量（0%、2%、3%和4%）的改性高早强砂浆的力学性能、阻尼性能、结构和组分进行了分析。结果表明，WER会延缓水泥水化反应，降低砂浆早期强度。但随着水泥继续水化和WER固化成膜，聚合物膜联结水化产物形成三维网络结构，构成分散性阻尼单元，进而增强砂浆的抗折强度、黏结强度和阻尼性能。尤其是当WER掺量为3%时，砂浆性能更好，能够满足水泥基快速修补材料对早期强度的要求。随着温度升高，砂浆宏观性能衰减，而WER较好的耐高温性和亲水性，有利于减轻砂浆力学强度和阻尼性能的劣化，改善其高温稳定性，这一规律在低于200 ℃范围内尤其明显。

关键词: 道路工程, 高早强砂浆, 快速修补水泥砂浆, 水性环氧树脂, 耐高温性能, 阻尼性能

Abstract:

In order to investigate the effect of high temperature on cement mortar modified with waterborne epoxy resin（WER）， this study analyzed the mechanical properties， damping capacity， structure and composition of high-early-strength cement mortar modified with different WER contents（0%， 2%， 3%， and 4%） after being treated at different temperatures（25， 100， 150， 200， and 300 °C）. The results showed that WER delayed the hydration reaction of cement， reduced the early strength of cement mortar. However， with the continuing hydration of cement and WER cures to form a film， the polymer film connects the hydration products to formed a three-dimensional network structure and constituted dispersed damping units to enhance the flexural strength， bond strength and damping capacity of cement mortar. Especially when the dosage of WER was 3%， cement mortar performed better and met the early-strength requirements of cement-based rapid repair materials. With the increase of temperature， the macroscopic performance of cement mortar deteriorated. The better high temperature resistance and hydrophilicity of WER helped alleviate the deterioration in mechanical strength and damping capacity of cement mortar to improve its thermal stability， this pattern is particularly especially within the range below 200 °C.

Key words: road engineering, high-early-strength mortar, rapid repair cement mortar, waterborne epoxy resin, high temperature resistance, damping capacity

中图分类号:

TU528

田耀刚,蒋静,赵成,杨小敏,张军,贾侃. 水性环氧树脂改性高早强砂浆的耐温机制[J]. 吉林大学学报(工学版), 2025, 55(7): 2203-2211.

Yao-gang TIAN,Jing JIANG,Cheng ZHAO,Xiao-min YANG,Jun ZHANG,Kan JIA. Temperature resistance mechanism of high-early-strength cement mortar modified with waterborne epoxy resin[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(7): 2203-2211.

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凝结时间/min		抗压强度/MPa			抗折强度/MPa			体积安定性
初凝	终凝	1 d	3 d	28 d	1 d	3 d	28 d	体积安定性
28	50	37.5	45.2	50.4	6.4	7.5	8.7	合格

	外观	固含量/%	pH	配合比
A	浅黄色黏稠液体	59~61	7~8	A∶B=1∶1.3
B	浅黄色黏稠液体	49~51	8~9	A∶B=1∶1.3