Sika Watertight Concrete

Liquid Pore Blocking Admixtures are designed to enhance the watertightness of concrete by physically reducing its permeability. These admixtures work by blocking the capillary pores within the concrete matrix, preventing water penetration and improving long-term durability. Sika’s range includes Sika-1 and SikaControl®-730 WT, both formulated to provide reliable, integral waterproofing performance for a wide range of concrete applications.

A Watertight Concrete System creates the optimum water/cement ratio through the use of water reducing admixtures:

SikaPlast® / Sika ViscoCrete® – mid and high range water reducing admixtures which decrease the volume of capillary pores and improve rheology and consistency.

These active components work throughout the pores and capillaries structure of the concrete to effectively seal the concrete permanently against the penetration of water and other liquids.

BenefIts of the Sika® WT Series in waterproof concrete results in the following advantages: 

• Increase in service life of the construction
•  Significantly improved durability and sustainability of the hardened concrete  ensured watertightness without other expensive measures 
• Reduced maintenance costs  
• Sika® Wt-200 series additionally enhances the self-healing properties of concrete and promotes the ability to heal concrete cracks

Advantages of Silica Fume in Concrete: 

Abrasion resistance
Concrete containing silica fume has very high abrasion resistance. In floor and pavement construction it increases durability in high-traffic areas. Its use saves money and time and improves operational efficiencies for the facility operator.

High strength

Compressive strengths are dramatically increased for high performance concretes. SikaFume® in conjunction with Sika superplasticisers are used to produce very high strength concrete. It is also much easier to pump concrete up the high-rise buildings during construction.

Corrosion resistance
The reduced permeability of silica fume provides protection against intrusion of chloride ions, thereby making it ideal for applications where concrete will be required to resist chemical attack.

Sulphate and chemical resistance
Concrete containing silica fume has a low penetrability and high chemical resistance that provides a higher degree of protection against sulphates.

Heat reduction

A higher rate of loss of heat from the outer surface of concrete causes cracking. Cracking is dangerous due to many reasons like reduced strength and reduced durability. Replacing cement with silica fume and observing the efficiency factor of silica fume, a lower maximum temperature rise and temperature differential will take place for concrete with the same strength.

Freeze-thaw resistance

Decreased permeability gives the concrete excellent freeze-thaw resistance because less water is trapped inside the cement paste.