Construction Proposal of Cement-based Permeable Crystalline Waterproof Material

Cement-based penetrating crystalline waterproof material (GB18445-2001) has been approved by design institutes, construction units, construction units and quality supervision agencies throughout the country in the past two years since the implementation of the national standard on March 1, 2002. Which not only reflects the role of the national standard in product promotion, but also reflects the unremitting efforts of the product production unit, and the design, construction, supervision unit of the new product recognition. In this paper, I would like to talk about the extensiveness of the application of cement-based penetrating crystalline waterproof materials and construction suggestions, the views of different comments in the industry, and the guidance of the national standard in the production and construction process. Personal knowledge.

Extensive application of products and construction suggestions

Cement-based penetrating crystalline waterproof materials have been officially put into use in China for more than a decade. Due to the complexity of import channels of masterbatch products and the high market price of products, manufacturers often consciously focus their product marketing focus on large-scale municipal projects such as subways, tunnels, culverts, and reservoirs to ensure timely withdrawal of funds. In terms of civil construction projects, product or construction prices also have room to go up. Over time, it creates a misunderstanding for product users. It seems that cement-based penetrating crystalline waterproof materials can only be used in underground projects such as subways and other large projects. Suitable for civil buildings. In fact, as the prices of imported raw materials for such products have fallen year by year, and as manufacturers have a balance of mind for product profit pursuit, with the implementation of the national standard and the understanding of the design department, the application scope of cement-based permeated crystalline waterproof materials has come The more extensive.

1, in the road and bridge project application:

Most of the road and bridge projects are municipal works, but most of the roads and bridges do not belong to underground engineering. In the past, almost no cement-based penetrating crystalline waterproof material was used, but in recent years, as people’s understanding of the products has deepened, they have begun to Gradually apply products to this field, such as Beijing, Henan, Zhejiang and other places.

Luqiao Project applies this type of material construction. We recommend that it be mainly used for the reinforcement of the road construction joints, the waterproof and anticorrosive coating of the concrete surface of bridge piers, and the anti-corrosion and waterproof treatment of welded joints. It is not advisable to use it as a sole material for pavements and decks.

2. Application on the external wall of the building:

At present, there are many waterproof coatings used on the external walls of buildings, but there are indeed many problems. First puttying leveling, if uneven and meticulous, it will affect the paint coating, cracking phenomenon from the shell more, of course, will be affected by the waterproof effect. If it cannot be constructed in rainy weather, it will also affect the overall construction period.

If the price of the project can be accepted (in fact, the price of cement-based penetrating crystalline waterproof material is very variable in the market), we suggest that the waterproofing project of the external wall of the building can use the cement-based penetrating crystalline waterproof material. . During construction, firstly, the outer concrete wall of the building shall be fully wetted, and then such materials shall be diluted with water and brushed. The feed water ratio will be reduced by about 25% compared with the underground waterproof construction, and the general feed water ratio is 4: 1 (or 3.5:1), the ratio of material to water used in the exterior wall of the building can be 3:1 (or 2.5:1). According to the different conditions of the base surface and construction site, the ratio of material to water can be slightly adjusted, generally not Affects the waterproof effect. The base surface of the construction has been completed. Sprinkler maintenance should be maintained for a period of 1 to 2 days. Afterwards, according to the design or construction party's advice, in the colorful architectural paint varieties, choose the most favorite brush.

Compared with commonly used exterior wall coatings, the use of cement-based penetrating crystalline water-repellent materials has several advantages: First, the coating and the base surface have strong compatibility, can not cause shell cracking, and the waterproof effect is good; second, the coating itself has Waterproof performance, infiltration crystal principle, waterproof effect is better, and the color coating outside the coating only plays a decorative role, different coatings have obvious effects. However, in the conventional construction, the putty only plays the role of leveling, and the waterproof coating must bear the responsibility of waterproofing, but also bear the obligation of decoration, and it is often difficult to achieve the best of both worlds. It may be acceptable in the short term, and the long-term effect is not well evaluated.

3, in the kitchen and toilet waterproof engineering applications:

In the construction of waterproofing in the interior of kitchens, bathrooms, etc., JS composite waterproof coatings and polyurethane waterproof coatings, modified asphalt-based waterproof coatings, etc. are currently used more often. With the deepening of people's understanding of the penetrating crystalline waterproof material, people will experience and appreciate the advantages of such materials in kitchen waterproof engineering. So far, civil engineering kitchens in major and medium-sized cities have used such materials, such as Beijing, Shanghai and Zhejiang.

In the construction process of kitchen and toilet waterproofing, the focus should be on the proper treatment of the contact between the buried pipe and the concrete base. We have three suggestions: First, pipe joints should be treated by plugging construction methods, and the V-grooves should be chipped to seal, and then the waterproof coating should be applied. Second, waterproof coatings should be applied along the side walls of 20 to 30 cm. To ensure that there will be no leakage from the corner; Third, if the conditions are available, the top plate is also made with a waterproof coating to prevent the upper layer from leaking underwater drops.

4, in the roof maintenance application:

Cement-based penetrating crystalline waterproofing materials have long been rejected for use on large-area roofing waterproofing projects for only one reason. It is a rigid waterproof material. Once the structure is cracked, the waterproof coating will lose its effectiveness. This refusal should be justified, but if in-depth discussion, people will doubt all waterproof material, because waterproof material is used to waterproof, not to prevent structural cracking, even flexible waterproof material, once Due to traction, no one can guarantee its waterproof effect. Therefore, while we are sensibly refusing the use of cement-based penetrating crystalline waterproof materials for large-area roof waterproofing projects, we should also be able to consider its other roles in roofing projects.

For roof waterproofing projects, we suggest three points: First, the use of such materials for flat and slanted roofs of small buildings. If conditions permit, they can be painted with a waterproof coating before doing color asphalt shingles. Make two waterproofs to ensure nothing is lost. The second is that such materials can be used for roof repair projects, such as maintenance of construction joints and settlement joints, leakage of small-area roofs, etc., which are quick and effective, so give it a try. Third, large-area roof projects can be used as rigid, flexible, and heat-insulating roads, or even more waterproof projects, and can use cement-based permeation-type crystalline waterproof materials as the first rigid waterproof. The design scheme can refer to the relevant plate sub-grid, hardness and softness. Multi-channel waterproof engineering design atlas.

The application of cement-based penetrating crystalline waterproof material is, of course, not limited to the above aspects. Others such as national grain storage, military tunnels, sewage treatment, dam maintenance, and urban water pipeline repairs have their uses. It is believed that with the stable and reasonable price of the product market after several years, its application will be more extensive.
Release Date:2009/8/11 14:40:15