Compressive Properties and Microstructure of Polymer-Concrete Under Dry Heat Environment at 80 °C
Tóm tắt
With the development of deep mines and deep tunnels, the phenomenon of high temperature is becoming more and more serious. Moreover, high temperature is one of the recognized extreme environments in the application of concrete. High temperature will significantly deteriorate the performance of concrete and shorten the service life of concrete structure. In this paper, firstly, According to the characteristics of temperature distribution, 80 °C was selected to simulate the dry heat environment. By adding organic polyurethane and fly ash into concrete, three types of concrete were prepared, in which polyurethane mainly replaced part of water content. The compressive properties of concrete at different ages under dry heat environment was studied. Then, the hydration products and structure distribution characteristics of three kinds of concrete were analyzed by SEM. Finally, the binding test between organic polyurethane and aggregates was designed under dry heat temperature. The results showed that compressive strength of polyurethane concrete under dry heat environment was higher than that of fly ash concrete and ordinary concrete, and polyurethane concrete had good temperature resistance. However, fly ash concrete had a shrinkage phenomenon at 28 days under dry heat temperature. Through microscopic analysis, the network structure was found between polyurethane and aggregate, the hydration degree of cement in polyurethane concrete was high, and the flocculent structure of polyurethane under dry heat temperature improved the stability of concrete structure. The research results could provide reference for the selection of concrete in tunnels and mines engineering roadway support under high temperature geological environment.
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