Construction method of cement-based capillary crystalline waterproof coating for underground engineering

Abstract

The invention belongs to the technical field of underground engineering waterproof construction, and particularly relates to a construction method of a cement-based capillary crystalline waterproof coating for underground engineering. The construction method comprises the following steps that S1, base layer treatment is conducted, specifically, sand blasting polishing is conducted on the surface of a concrete base layer to obtain a rough and clean base surface; S2, joint treatment is conducted, specifically, a U-shaped groove is formed in the defect portion of the base surface through chiseling, and after repairing slurry is subjected to brush coating, the groove is filled with repairing filler, and the repairing filler is compacted and polished till the repairing filler is flush with thebase surface; S3, base surface pre-wetting is conducted, specifically the base surface is wetted by using a pre-wetting solution containing fatty alcohol-polyoxyethylene ether and a water-based polyether defoaming agent; S4, brush coating operation is conducted, specifically, the cement-based capillary crystalline waterproof coating is added into water to be prepared into waterproof slurry, and brush coating construction is conducted on the base surface twice to form a waterproof coating; and S5, wet maintenance is conducted. The waterproof coating obtained through the construction method is complete and uniform, firm in combination with the base surface, free of bubbling, peeling, pulverization, falling, cracks, water seepage and water leakage, high in one-time brush coating percent of pass and good in waterproof effect.

Description

technical field [0001] The invention belongs to the technical field of underground engineering waterproof construction, and in particular relates to a construction method of cement-based permeable crystalline waterproof coating for underground engineering. Background technique [0002] As the most common building material, concrete itself is microscopically porous, and its interior and surface contain many pores and cracks that are inevitably formed due to structural and construction reasons, which seriously affect the permeability and strength of concrete structures. Leakage problems are prone to occur, especially in underground projects, superimposed floods (urban waterlogging), rainy seasons, pipe ruptures (water supply, sewage, heating, etc.), will also promote the occurrence and development of other building diseases, seriously affecting construction projects quality, safety and service life. Therefore, it is necessary to do waterproof and anti-seepage treatment on the...

AI Technical Summary

Problems solved by technology

[0005] However, cement-based permeable crystalline waterproof coatings are used for waterproof construction on the concrete base of underground projects, and the quality requirements are often not met during acceptance. The pass rate of one-time painting is low, only about 80%. The unqualified problems and defects mainly include: Inadequate bonding between the coating and the base layer leads to bubbling and peeling; powdering and peeling of the coating surface during the shelf life; cracks and partial leakage on the coating surface, etc.

After on-the-spot investigation, analysis and discussion, after excluding the quality problems of the paint itself, the main reasons for the above defects are that in order to shorten the construction period, the construction method is too extensive, the base layer is simply treated, and the nodes are not strengthened, thus forming weak waterproof nodes that cannot be fully utilized. The waterproof effect advertised by this kind of waterproof coating is low, and the rework and repair rate is high, which prolongs the construction period

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