Research on waterproofness of expanded perlite thermal insulation mortar

Hydrophobe modified expangded perlite were prepared by soaking method.The change law of water absorption,compressive strength and dry density of perlite thermal insulation mortar were investigated by the change of mass-volume concentration and the addition of waterproof agent,basing on the modification of expanded perlite.The results show that the water absorption of perlite can be decreased from 290% to 90%when the surface of expanded perlite is modified by silicone water-proofing agent.With the decreasing of mass-volume concentration,the water absorption of perlite insulation mortar increases,the compressive strength and dry density decrease.The water absorption of perlite insulation mortar can be decreased further by adding water-proofing agent for perlite,supposing the optimal mass-volume concentration is selected.