Effects of Active Admixtures on Comprehensive Properties of Epoxy Resin Repair Mortar

Abstract

Abstract: In order to explore the modification effect of active admixtures on epoxy resin repair mortar and provide basis for repair engineering application, the effects of silica fume and fly ash on the mechanical properties, bonding strength, dimensional stability and frost resistance of epoxy resin repair mortar were studied. The influence mechanism was explored and analyzed by the scanning electron microscope (SEM) and mercury intrusion method. The results indicate that epoxy resin reduces the compressive strength of mortar. Adding silica fume can make up for strength loss. The strength of mortar mixed with fly ash increases with the increase of age, but the strength of mortar at 28 d and 56 d is lower than that of the control group. Silica fume and low-content fly ash (≤10%, mass fraction) improve the bonding strength of repair mortar. However, silica fume has a negative effect on the dimensional stability of repair mortar, while fly ash has the opposite effect. The frost resistance of mortar increases first and then decreases along with the increase of silica fume content. And the frost resistance decreases with the increase of fly ash content. When epoxy resin emulsion and active admixture are mixed into mortar, the hydration products and the cured epoxy resin film form an interwoven spatial network structure to improve the compactness. And silica fume and fly ash can refine the pore size of slurry. So the improvement effect of silica fume powder is better.

Key words: epoxy resin repair mortar, active admixture, compressive strength, bonding strength, dimensional stability, frost resistance

CLC Number:

TU528.41

GONG Jianqing, LI Falei, LI Ke, QU Zhigang. Effects of Active Admixtures on Comprehensive Properties of Epoxy Resin Repair Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1137-1146.

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