Concrete is a versatile building material and is very popular. It is highly durable, but cannot withstand exposure to moisture. The concrete surface is porous and when exposed to long moisture, the concrete structure begins to deteriorate over time.
The waterproofing layer is the optimal solution to maintain the integrity and prolong the life of buildings and concrete products. Often concrete waterproofing is a necessary measure under high humidity and direct contact with water: waterproofing of roofs, waterproofing of foundations; Basement; pool; floors, etc…
Waterproofing material is one of the indispensable effective solutions to bring high efficiency to projects over time. Currently there are many types of waterproof materials from long-standing materials such as polymer cement or membrane types, with new polyurethane materials or advanced polyurea-based materials. What are the advantages and shortcomings of each type, let’s find out the information through the comparison of waterproofing materials below.
- Waterproofing of concrete by polyurea
- Polyurethane concrete waterproofing
- Original materials Cement Polymers, Bitumen
Polyurea Coating – Polyurethane Coating – Original Cement Polymers,Bitumen
|Main factors||Polyurea Coating||Polyurethane Coating||Original Cement Polymers,Bitumen|
|Resistance to mechanical damage||high||high||low|
|Resistance to temperature changes||high||high||low|
|Requires foundation preparation||high||high||average|
|Color spectrum||wide||limit||Not available|
|Service life, years||over twenty years||less than ten years||less than five years|
|Waterproofing cost per 1m²||from 500.000vnđ||from 350.000vnđ||from 200.000vnđ|
|Cost dependence on the complexity of the surface||low|
|The cost dependence on the construction area||Significant increase (small area, high price, if the area is too small, it will be difficult to deploy)|
WATERPROOFING BY POLYUREA
Polyurea application is a modern technology which is very popular with experts in the world. This method deserves special attention, because it is the most effective and beneficial in most cases requiring reliable protection and waterproofing of concrete surfaces.
Polyureas are formed by mixing two ingredients. The material is applied by two-component drying and a special high-pressure spray. Mixing of components takes place directly in the spray gun chamber during construction. Polyureas harden very quickly and form a monolithic and uniform protective layer. It is an elastic and durable coating that has a high adhesion rate on all surfaces. Polyurea waterproof concrete is a reliable protection against moisture and destruction. What is Polyurea ?
MAIN BENEFITS OF POLYUREA:
- Seamless coating without seams and joints
- The coating is elastic and very durable, with high wear resistance
- Fast curing time (coating can continue for 1 minute after application)
- High working speed
- Durability (over 20 years)
- Environmentally friendly of polyurea (free from harmful solvents and impurities)
RECOMMENDATIONS TO APPLY POLYUREA TO CONCRETE
For high-quality polyurea coatings, attention should be paid to the preparation of the insulating surface. Concrete surface is free of dirt and oil stains. Major defects are removed and smoothed. The concrete floor is dried, if necessary (allowable humidity does not exceed 8%). Dry and clean surfaces are coated with a primer to close pores and improve polyurea adhesion. This operation is required for all porous surfaces (concrete, cement, plaster, bricks). After the primer has dried, a layer of polyurea of the required thickness is applied. In practice, it has been determined that a layer of polyurea with a thickness of at least 1.5mm is the optimal solution for waterproofing concrete surfaces.
Polyurea manufacturers usually indicate polyurea consumption in the order of 1.1 kg / 1 square meter. with a coating thickness of 1 mm. Those, that. To apply a 2 mm waterproof polyurea layer, approximately 2.2 kg is required. material. It should be noted that such consumption is possible under laboratory conditions. In practice, the consumption is about 2.4 kg / 1m2, with a waterproof layer thickness of 2 mm.
ADVANTAGES OF POLYUREA
Disadvantages include the fact that polyurea coatings cannot be applied without special equipment and a technically trained professionally in Polyurea technology.