Disclosure: 1. Material preparation: cement-based permeable crystalline waterproof coating; 2. Machine preparation: 2. 1 Construction tools: special paint tools, steel chisels, wire brushes, etc. 2.2 Mixing tools: hand-held electric mixer, mixing barrel, etc. Third, the operating condition is 3. 1. The base should be smooth, firm and free of oil pollution; 3.2 The concrete base surface shall be soaked in water, but there shall be no Mingshui; 3.3 Construction shall not be carried out in the rain or when the temperature is lower than 4℃. Iv. technical requirements 4. 1 cement mortar is mixed for coating construction, and the coating mixing should be fully uniform; 4.2 The coating thickness of cement-based waterproof coating shall not be less than 0.8 mm V. Construction technology 5. 1 Basic treatment technology: concrete base surface treatment → fully wet base surface → pulping → coating → inspection → maintenance → acceptance. 5. 1. 1 pile head treatment: after the pile head is manually chiseled to the designed pile top elevation, the surface of the pile head is chiseled flat with a steel chisel, and loose stones and cracked concrete are removed, and the pile head is chiseled to the dense concrete surface. 5. 1.2 Treatment of construction joint at the bottom of natural foundation beam: chisel the surface of construction joint with a steel chisel, remove loose stones and cracked concrete, scrape it to the dense concrete surface, and clean the cement slurry above the steel bar with a wire brush. 5.2 Wet the concrete base with water to make it moist and moist, with no Mingshui on the surface. 5.3 When preparing the coating, according to the powder-water ratio of the osmotic crystallization material = 1: 0.35 (weight ratio), pour the weighed powdery osmotic crystallization material and clear water into a mixing container, and fully stir with a low-speed drill with blades (250 rpm) to ensure that the mixture is uniform and free from particles and caking. The mixing amount depends on the number of construction workers, but the time interval from the completion of mixing to the end of use should not exceed 30 minutes, and the mixing should be uninterrupted during use, but water or powder should not be added at will. 5.4 Painting 5.4. 1 Distribute the mixed mixture to each operator's bucket, and brush it back and forth on the surface of concrete base, with a thickness of not less than 0.8 mm..5.4.2 Brush the cement-based waterproof coating evenly on the concrete surface, adopting the principles of detail first, bedding face later, height first, and rear plane first. 5.5 Brush coating range: the elevation of the top of pile head and pile head 100mm, the high elevation of the bottom of foundation beam of natural foundation and below the construction joint100 mm.. 5.6 curing 5.6. 1 clear water curing: spray water evenly with a sprayer, 3-5 times a day, and the spraying amount depends on the final setting or humidity of concrete, and the curing time is 2-3 days; 5.6.2 Within 48 hours after construction, the coating shall be protected from rain and sunlight; 5.6.3 During the curing period, it is not allowed to pile up any items or carry out other construction on the waterproof layer; 5.6.4 There shall be no bump or damage during curing. The waterproof layer and details painted by intransitive verbs according to quality standard 6. 1 shall be waterproof and impervious as a whole. 6.2 The coating thickness should be uniform, and brush leakage is not allowed. Seven, finished product protection 7. 1 waterproof layer should be protected by designated personnel after painting, and the waterproof layer should not be destroyed. 7.2 Before the coating waterproof layer solidifies, pedestrians and trampling are not allowed. 8. Safe and civilized construction 8. 1 Avoid direct contact between paint and skin. If it spills into your eyes, be sure to rinse it with clear water at the first time and go to the hospital for treatment in time. 8.2 Strengthen the concept of safety legal system, conduct education and training before construction, and conduct safety inspection for each construction worker before entering the site. 8.3 When using hand-held electric mixer, attention should be paid to the safety of electricity use.