(One hundred questions on waterproofing) What is the most common mistake in the construction process when waterproofing a #84new construction site pond? Is it suitable to use PU, EPOXY or FRP construction?

Answer:

(1) In the process of waterproofing the tank, the most common mistake on construction sites is to first paint the base and then apply the waterproofing coating. The reason is that since tanks are prone to the four major structural defects mentioned in question 83, if the base is not first reinforced by drilling and other methods, the waterproofing coating applied to the surface alone will not be able to prevent water leakage very effectively.

(2) Theoretically, the water tank’s waterproof construction can be made using PU, EPOXY, or FRP materials. Since these materials have the ability to resist cracking and withstand water pressure, they should be suitable for waterproof construction. However, there are several blind spots in the construction process:

1. The internal ventilation of the tank is poor, and thesePU、EPOXY或FRPOil-based paints are prone to causing toxic effects on workers during the construction process, and most of the heavy metal content after construction is above the allowable level; therefore, most countries today ban the use of this method for drinking water pools.
2. It must be completely dry or have a water content less than8%Only when these conditions are met can construction be carried out; otherwise, it is easy to fail, and such construction conditions are extremely difficult to achieve.
3. When tiling the surface, the adhesion is very poor.
4. Post-incident leak detection and repair work are not easy.