Waterproof concrete is an impermeable concrete used for long-lasting, durable watertight construction. To improve the impermeability of the concrete, water-resisting admixtures can be added. Nevertheless, design and construction of a watertight concrete structure is a system approach, and waterproof concrete is only one element of it. Water impermeability is determined by fulfilling requirements to limit water permeability through the concrete itself, the joints, installation parts and cracks.
Waterproofing is required at below-grade concrete surlaces for several reasons. The primary reason is to keep moisture from intruding into the facility. However, it is also required to protect the structural contents from water infiltration that can cause structural damage to the concrete or corrosion to the imbedded steel. Concrete is by design a porous material, and water can pass through it by hydrostatic pressure, water vapor gradient or capillary action. Water can also enter at cracks, structural defects or at improperly designed or installed joints. Waterproofing is also required to eliminate deterioration to the concrete that can occur from exterior and interior chemicals that are present at the building site.
Nirman Chemicals Limited offers:

NIROPROOF CRY -An integral capillary waterproofing system. It contains specialist additives that plays role of catalyst in the formation of water-insoluble crystalline microstructures deep within the capillaries and interstices of cementitious matrix of concrete and mortars. As the crystalline capillary waterproofing system enables effective pore sealing it does not create film formation on the surface and is not affected by the negative hydrostatic pressure. The system is equally effective against both positive and negative water pressure or osmotic pressure.

Advantages

• Imparts integral watertightness to structures
• Protects from waterborne corrosive agents.
• Permanently active – crystalline action is
  reactivated by contact with water.
• Equally effective against both positive and negative water pressure or osmotic pressure.
• Non-toxic and non-tainting

Applications:

• Water tanks, Reservoirs
• Building Basements & foundations
• Swimming pools and water parks
• Sewage and Water treatment plants
• Dams, canals, Tunnels, Harbours
• Retaining walls & sea defence walls
• Concrete pipes

Conforms to IS 2645-2003

We also offer our NIROPROOF IW is an Integral waterproofing liquid admixture based on water reducing system and hydrophobic & capillary blocking system, this combine effect acts both as a highly efficient plasticizer and waterproofing compound.

Advantages:

• Improves workability without increased water content disperses throughout the mix very quickly and produces uniform waterproofing throughout concrete matrix
• Reduces permeability of concrete/ mortar at higher level
• Allows easier compaction leading to denser concrete and superior finish
• Produces dense concrete by minimizing the porosity and honey-combing in concrete.

Applications:

• Roof slab concrete
• Basement concrete
• Screed and plasters
• Concrete water tanks, sumps and drains

Conforms to IS 2645-2003 and ASTM C494