Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (7): 2203-2211.doi: 10.13229/j.cnki.jdxbgxb.20231161

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Temperature resistance mechanism of high-early-strength cement mortar modified with waterborne epoxy resin

Yao-gang TIAN1(),Jing JIANG1,Cheng ZHAO2,Xiao-min YANG3,Jun ZHANG4,Kan JIA1   

  1. 1.School of Materials Science and Engineering，Chang’an University，Xi’an 710064，China
    2.Northwest Civil Aviation Airport Construction Group Co. ，Ltd，Xi’an 710065，China
    3.Concrete Branch of Xi'an Railway Engineering Co. ，Ltd. of China Railway Seventh Bureau Group，Xi’an 710032，China
    4.School of Engineering Machinery，Chang'an University，Xi’an 710064，China
  • Received:2023-10-27 Online:2025-07-01 Published:2025-09-12

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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

CLC Number: 

  • TU528

Table 1

Basic properties of composite cementitious material"

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 d3 d28 d1 d3 d28 d
285037.545.250.46.47.58.7合格

Table 2

Basic characteristics of epoxy resin and curing agent"

外观固含量/%pH配合比
A浅黄色黏稠液体59~617~8A∶B=1∶1.3
B浅黄色黏稠液体49~518~9

Table 3

Basic properties of polypropylene fiber"

长度/mm密度/（kg·m-3）抗拉强度/MPa拉伸极限/%
60.910>358>15

Fig.1

Test for bonding strength"

Fig.2

Test for damping capacity"

Fig.3

Effect of WER's dosage on strength of mortar at different ages"

Fig.4

Effect of WER's dosage on strength of 28-day-aged mortar exposed to different temperatures"

Fig.5

Effect of WER's dosage on bonding strength of 28-day-aged mortar exposed to different temperatures"

Fig.6

Effect of WER's dosage and temperature on ξ of 28-day-aged mortar"

Fig.7

Infrared spectrum of 28-day-aged mortar under effect of WER's dosage and temperature"

Fig.8

Thermogravimetric changes of 28-day-aged mortar under effect of WER's dosage and temperature"

Fig.9

Microscopic morphology of 28-day-aged mortar under effect of WER's dosage and temperature"

Fig.10

Different damping layers formed by WER in 28-day-aged mortar"

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