Sodium-based bentonite waterproof blanket manufacturers analyze the problems in waterproof engineering:
Our Shuimu Engineering Materials Co., Ltd. specializes in the production of sodium-based bentonite waterproof blanket http://, which has accumulated rich experience in construction. Today, we will take you to some of the problems encountered during construction:
In fact, there is no uniform definition of waterproof materials. The continuous updating of waterproof technology also accelerates the diversification of waterproof materials. In general, it prevents rainwater, groundwater, industrial and civil water supply and drainage, corrosive liquids, and moisture and vapor in the air. The materials that invade the building are basically collectively referred to as waterproof materials.
Analysis of problems in waterproof engineering:
The moisture content of the basement layer of the basement is very high. The water-proof construction of the waterproof membrane requires a moisture content of not more than 9%, but the moisture content of the base surface of the basement is generally more than 30%, and some are higher, especially the water content in the trench is higher. 80-90% or more, the success rate of construction with waterproof coil under these conditions is almost equal to zero. It adopts inorganic waterproof coating construction which can be applied on the base surface with water content of more than 95%, or composite construction technology of inorganic waterproof coating and cement-based polymer organic flexible coating. Special waterproof membranes with special functions are not described here.
The basement floor is 1 meter thick and does not need to be waterproof?
Concrete seepage is independent of thickness. Concrete can only play a waterproof role, but it cannot prevent seepage. Concrete is composed of cement and sandstone. The cement needs about 25-27% of water in the process of hydration. However, only 25% of water can't stir the concrete into slurry. It must be added 40-50. About % of water can meet the requirements for workability during concrete mixing. After the cement hydration process is over, the remaining water is evaporated, leaving a gap that is a channel for water seepage – called a capillary network channel.
Is the structure self-waterproof to replace the waterproof structure?
The self-waterproof structure is an additive to achieve waterproofing, which is only a psychological balance. The structure is self-waterproofing with a micro-expansion agent (called UEA or AEA) when the concrete is stirred. Its mechanism is to generate an expansion stress of 0.2-0.7 to offset the shrinkage stress of the cement during the hydration process.
But it has three strict conditions:
1. This additive must be evenly distributed in the concrete;
2, due to the lighter addition materials, the concrete can not be too thin;
3, the additive is extremely vulnerable to moisture, once it is damp, it begins to complete the mission of expansion, this moisturizing additive is harmful and unhelpful.
These three conditions are difficult to achieve in large-scale operations for the simple reason:
1. The additive is added in proportion to 8% of the cement. It is almost impossible to add the 8% additive to the mixture of sand and cement of several times the amount of cement. If it cannot be homogenized, it will appear. There are many local additives and few places. Excessive expansion stress occurs in places where there are many additives, and insufficient expansion stress occurs in places where there are few additives. Stress imbalance occurs at the interface where stress is excessive or insufficient, and cracking occurs.
2, the concrete should be transported out, in order to achieve the effect of retardation and the concrete slurry will be relatively thin, so that the additive will float, and once the additive floats, it will complete the expansion mission in the upper part.
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