A; early strength product characteristics and uses of concrete admixtures waterproofing agent-based China Development Center developed an accelerated development of early strength concrete, new cement admixtures improve the performance of its impermeability. The product in March 1997 through the National Anti-approved testing construction materials testing, the indicators are in line with GB8076-87 standards. Early strength waterproofing agent applied to schedule an urgent request early strength and impermeability of high water projects and general water projects. This product can be widely used for waterproofing concrete construction tunnels, towers, tanks, aqueducts, mine shafts and tunnel engineering, rigid roof, underground engineering and other labels. Mixed with triethanolamine early strength concrete waterproofing agent formulated to improve water impermeability of concrete, impermeability pressure can be increased more than three times. Two; product performance early strength water repellent quality standard technical performance quality indicators technical performance quality indicators Water Reduction /% bleeding rate /% difference between setting time / min initial set final setting shrinkage ratio /% - <100 +120 ~ + ~ + 120-120 120 <120 compressive strength ratio /% 1d 3d 7d 28d 90d> 125> 120> 110> 95> 95 three; method of preparation of waterproof concrete construction method is as follows. ? When designing impermeability pressure is 0.8 ~ 1.2MPa, the amount of cement to 300kg / m3 is appropriate. May be ordinary portland cement, the requirements of the low heat of hydration of slag cement waterproofing can be used. o sand with sand. Sand rate must decrease with a corresponding increase in the amount of cement. o on gravel gradation No special requirements. o early strength cement waterproofing agents for different varieties of adaptability, especially to improve the bleeding of slag cement and sticky tape resistance, significantly increase its impermeability. o water repellent solution is added together with the mixing water, about 2kg 50kg cement and processing solution. o water repellent admixture should be uniform and mixing with water and then put into the mixer, mixing concrete.