Durability and mechanism of waterborne epoxy resin modified bridgeconcrete in humid and hot environment(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2022年2期
- Page:
- 32-42
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Durability and mechanism of waterborne epoxy resin modified bridgeconcrete in humid and hot environment
- Author(s):
- GUO Yinchuan; ZHANG Chong; SHEN Aiqin; CHOU Tao; WANG Wenzhen; ZHOU Xiaohan; WEI Xin
- Key Laboratory of Highway Engineering in Special Region of Ministry of Education,Changan University, Xian 710064, Shaanxi, China
- Keywords:
- road engineering; bridge concrete; waterborne epoxy resin; durability; hot and humid enviroment; chloride ion penetration resistance
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to effectively improve the internal structure of bridge concrete in hot and humid areas and improve the durability of bridge concrete, waterborne epoxy resin was used to modify the bridge concrete. Humid and hot environment was simulated indoors.Based on the electric flux test, water seepage height method and sulfate corrosion resistance test, the influence of waterborne epoxy resin content on the chloride ion penetration resistance, impermeability and corrosion resistance of bridge concrete was studied. The improvement mechanism of waterborne epoxy resin on the mircro pore structure of bridge concrete was analyzed by mercury intrusion method combined with micro pore morphology. The relationship between the pore structure of bridge concrete and the impermeability of bridge concrete was explored. The results show that the reasonable amount of waterborne epoxy resin has an excellent effect on improving the durability of bridge concrete, 3% (mass fraction the same below) of the waterborne epoxy resin significantly improves the resistance to chloride ion penetration of bridge concrete, at the same time, the impermeability of 3% waterborne epoxy resin modified bridge concrete is also significantly improved, under the condition of 60 times of dry and wet cycles, the modified concrete with 6% waterborne epoxy resin has the best corrosion resistance, and its compressive strength corrosion resistant coefficient reaches 92.3%. When the content of waterborne epoxy resin is 3%, the improvement effect of waterborne epoxy resin on the pore structure and pore size distribution of bridge concrete is the most significant. The total pore volume, average pore diameter and porosity of bridge concrete are reduced by 20.31%, 29.11% and 9.49% respectively, and the proportion of multiple harmful holes and harmful holes is significantly reduced. At the same time, it is found that the average pore size and porosity have a good correlation with the impermeability. The waterborne epoxy resin with reasonable content can effectively reduce the porosity of concrete, fill the connected pores, hinder the migration of chloride ions in the concrete, so as to improve the impermeability of concrete. The waterborne epoxy resin has a good effect on improving the durability of bridge concrete in hot and humid. 4 tabs, 13 figs, 28 refs.
Last Update: 2022-04-13