Concrete is a water-based material therefore, it should only be mixed with water-based materials and additives.
In order to achieve better workability of concrete, ease of concrete placing and its consolidation, a standard amount of water is required for proper hydration. Excess water remains in the concrete mass and evaporates over time. As a result, ducts and hair pores remain in the concrete, which is the most important reason for concrete porosity and permeability.
The holes, capillaries, and pores that still remain in the hard concrete leave the way open for water and corrosive chemicals to enter and infiltrate the concrete, causing the bars to corrode faster.
Excess water increases the number of shrinkage cracks during curing.
In order to reduce the water to cement ratio in the concrete mix, the plasticizers can be used. Although the size and permeability of the remained pores and holes are reduced to an extent, water, salts, and corrosive chemicals may infiltrate into the concrete. Even the use of super-plasticizers alone does not seal the concrete in any way.
A good reliable way to solve this problem is to use N50.
N50 and B70 increase the density of concrete particles and improve their adhesiveness of the surface of the bars and structural metal accessories. Hence, they are effective in preventing water and sewage to infiltrate. As a result, the concrete and mortars that are made with these materials have higher bending and tensile coefficients in comparison to the blank samples.
If the metal reinforcing bars are close to the outer surface of the concrete, they will be corroded and destroyed by the thawing-freezing cycles caused by the cracks. If the concrete cover on the bars is not enough, the steel rebar grids will be exposed to corrosion and rust. In addition, the expansion of metal creates internal forces in the concrete due to the difference in the rate of expansion and contraction of the metal and the concrete.
When these forces exceed the tensile strength of concrete, the concrete cracks. With the use of Z90, B70, N50, and other products of NSG Co. this coefficient difference has reached the lowest level, and the intense adhesion between concrete and rebar prevents that the temperature change leads to different expansion amounts.
Furthermore, it is sufficient to add Z90 in the cement plastering layers that are used for sealing and strengthening. A layer of this material with a thickness of 2 microns up to 5 millimeters is able to withstand the toughest pressures of water and sewage.
NSG materials and products are all penetrative and have a permanent service life, and remain durable and retain their sealing and anti-moisture properties as long as the structure is not physically deconstructed.
Sealing and hydrophobizing eliminate the freezing effect and destruction of the structures in the cold seasons.
The sealing and strengthening products of NSG Co.:
- Are able to tighten all the pores of the structure by penetrating into the surface and creating a new texture
- Can be mixed in all the mortars and concretes, and have always the tendency to create bonds with layers.
- Are easy to use for sealing, repairing and restoring the structures.