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The mechanical and waterproofing properties of slow-setting waterproof mortars were systematically investigated using appropriate tools.Whereas the addition of polymer re-dispersable powders decreases the compressive strength of waterproof mortars,it increases the flexural strength of waterproof mortars.Furthermore,the addition of polymer re-dispersable powders improves the water impermeability of waterproof mortars.In addition,the penetration rate of a water drop on the surfaces of mortars is greatly increased due to the addition of polymer re-dispersable powders,vividly indicating that the waterproof impermeability of mortars are indeed improved because of the polymer modification.