The Pore Forming And Control Of Mortar Modified With Epoxy Resin

This paper adopts the optimal mixture ratio as benchmark mortar and examines thedistinct pore structure, mechanical property, durability through three differentdefoaming measures, admixtures, additive and production process. It is found that:The adoption of constant temperature bath, to increase the temperature of emulsionto a proper degree, would be efficient in the decrease of air content and porosity.Besides, rupture strength and bonding property could also be improved on the premisethat the requirements of compressive strength have been met.The addition of admixtures could improve the micro-gradation of waterborneepoxy emulsion modified mortar and lead to pozzolanic effect, thus reducing porosityand optimizing pore structure. The performances of mortar, which is produced byproper-rationed multiple admixtures, are better than those mortar produced by singleadmixtures.Superplasticizer could remarkably boost the fluidity of waterborne epoxy emulsionmodified mortar, reduce the pore content of mortar, enhance gel pores content andoptimize pore structure. By comparison, it is discovered polycarboxylatesuperplasticizer performs best in decreasing water of waterborne epoxy emulsionmodified mortar.Defoamer could improve the pore structure of mortar remarkably by means ofreducing both the content and diameter of pore. By comparison, organic silicondefoamer appears higher efficiency in the defoaming of waterborne epoxy emulsionmodified mortar than any other defoamer.Through the decrease of pore content and porosity, admixtures, superplasticizerand defoamer enable the chloride ion penetrability of mortar enhance in solutioncorrosion circumstance. Besides, these three measures could lessen the dissolving andresolving effects of the solution on CH and C-S-H, thus lessening the crystallizationcaused by Na2SO4in pore.Therefore, erosion coefficient of mortar enhances and massloss decreases. Though, the45℃constant temperature water bath would lower thechloride ion penetrability and resist compression erosion coefficient of mortar slightly, itstill remains to be a feasible means to improve the rupture erosion coefficient of mortar.