The invention relates to waterproof crack-resistant inorganic heat-insulating
mortar and a preparation method thereof. The
mortar comprises 5-10 m<3> of small expended and vitrified balls, 0-1 m<3> of pottery sand, 750-850 kg of ordinary
portland cement, 50-100 kg of
calcium powder, 35-70 kg of hydrated
lime, 30-55 kg of siliceous dust, 15-20 kg of dispersible
polymer powder, 4-8 kg of hydroxypropyl
methyl cellulose ether, 1-2 kg of mekralon, 0.5-1 kg of capillary crystalline waterfroof agent, and 3-5 kg of wood
fiber. The preparation method comprises the following steps: loading ordinary
portland cement, siliceous dust, hydrated
lime, hydroxypropyl
methyl cellulose ether, dispersible
polymer powder,
calcium powder, mekralon, capillary crystalline waterfroof agent and wood
fiber at one time, and stirring for 3 min; adding small expended and vitrified balls and pottery sand in the stirred powder blend, and continuously stirring for 2 min; and packaging and storing the finished productsin warehouse. Compared with the prior art, by using the pottery sand and capillary crystalline waterfroof agent, the problems of large water absorption, easy
cracking when
water seepage occurs and the like of traditional inorganic small expended and vitrified ball heat-insulating
mortar are solved.