Application of Cement-based Permeable Crystalline Waterproof Materials in Housing Construction Engineering Ren Jia 1 Ren Li 1 (1. China Construction No. 8 Engineering Bureau Dalian Company 2. Shanghai Shisanye Construction Co., Ltd.) Cement-based permeation crystal The waterproof material is a powdery material in which a plurality of active chemical substances are mixed as a main base material, such as cement and quartz powder.
The waterproof material belongs to inorganic mixture, under the guidance of water, with water as carrier, with strong permeability (usually permeable depth up to 150mm, maximum penetration depth up to 300mm), transmission and filling in micropores and capillaries. , Physicochemical reactions take place, forming insoluble dendritic crystals, filling the capillary channels, and combining the crystals with the tantalum structure to form a closed waterproof layer. It can block water flow and other liquid erosion from any direction and is easily qualified for buildings. The waterproof surface of the water surface and the back surface. After several years, secondary crystallization can also be carried out. It is completely waterproof and life-free.
Suitable for basement, tunnels, dams, reservoirs, swimming pools, sewers, sewage treatment plants, and other underground, above-ground buildings, concrete seals, and aquarium waterproofing. Within 12 hours after construction, the weather such as the hot sun, rain and frost should be avoided. 3 For tanks and other structures, water must be stored after the coating has been applied for 2 days.
The cement-based penetrating crystalline waterproof coating is applied to the exterior wall surface and masonry structure protection wall (M5 cement mortar surface). Process requirements 3.2.3 Waterproof layer construction: 1 The construction surface shall be wetted with clean water before construction; 2 Select professional spraying equipment; 3 First thinly spray a layer of prepared slurry, then spray on the second layer of thicker slurry. Material, the use of two layers of slurry is 0.8 ~ 1.0kg/m2; 4 in the surface of the masonry structure: first spray the first layer of waterproof slurry, before the initial coagulation of the slurry, brush spray on the slurry, the direction of Spray the opposite. The average dosage is 0.8~1.0kg/m2.5. The thickness of the waterproof layer is more than 0.8mm, generally not more than 2mm. Curing: Same as 3.1.4. The dry powder spreading method adopts the cement-based penetrating crystal water-repellent agent and is suitable for plane fascia.
3.3.3 Waterproof layer construction: Waterproof material shall be sprinkled evenly on the pre-wet base surface with an average amount of 1. 0kg/m2 half an hour before pouring the concrete.
The cement-based penetrating crystal water repellent is applied to the concrete structure. The technological requirements are as follows: the proportion is added into the crucible and the mixing is uniform; 2 the vibrating crucible should be strengthened when pouring; 3 the addition of the water repellent should be completed within 3 hours of stirring.
3.4.2 Maintenance: 1 After the pouring, spray water to cure. Usually spray 3 times a day, for 3 consecutive days, hot days and dry weather should be sprayed several times. 2 For structures such as pools, swimming pools, reservoirs, etc., they must be stored for 2 days before they can be stored.
Characteristics of Cement-based Permeable Crystalline Waterproof Material This material forms crystals under the condition of moisture to prevent moisture and corrosive chemicals from contacting the steel bar and protect the steel.
The initial chemical reaction of the material delayed the hardening and curing of the concrete, resulting in greater ultimate strength than the untreated concrete and at the same time preventing damage to the concrete due to freeze-thaw cycles.
The material has no special requirements on the base surface, no detailed preparation, no need to measure, cut, reinforce and seal corners, etc., it will not be pierced, torn or lifted, and there is no construction joint; in the treatment of Yin Yang angle, etc. It is easy to ensure quality at the outlet; construction is simple and the construction period can be greatly shortened.
The cost of the waterproof material base layer treatment is almost zero, and it costs about 40-50 yuan/m2 less than other waterproof materials; the waterproof layer does not need a protective layer after construction, and the underground outdoor wall can be directly backfilled.
Engineering technology The waterproof material has a strong automatic crack repair function ( 4.6 is conducive to product protection and maintenance of the waterproof material and concrete to form one, is not afraid of smashing, touching, poking, easy to protect the finished product, there is no hidden danger caused by the project. Water leaks can be found directly at the leaking point.
At present, the construction process and quality standards for cement-based penetrating crystalline waterproof materials are still not perfect, and they need to be summarized and revised in practice. The waterproof material has not been completely accepted by the market, but its unique waterproof performance and advantages are other. Waterproof material cannot be replaced. It is bound to become the first choice of waterproof products for future housing construction projects, and fundamentally improve the quality of construction waterproof technology and engineering in China.
People's Republic of China national standard "underground waterproof technical specifications" 2001 * 07 * 04 * 12 * 31 2001 issued by General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China People's Republic of China Ministry of Construction jointly issued Press: China Building Industry Press Author: Shen Chunlin ISBM: 7-112-
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