Waterproofing Concrete Tanks

To achieve effective Waterproofing Concrete Tanks using reinforced concrete forms, the WS30 water stop strip is strategically placed horizontally between the first and second layers of reinforcement in the floor and walls. This ensures that after pouring the floor concrete, half of the width of the water stop is embedded within the first pour, enhancing the tank’s resistance to leaks.

Purpose of Using WS30 Water Stop:

A key challenge in Waterproofing Concrete Tanks is preventing leaks at joints or points where concrete pours are terminated. The WS30 water stop effectively seals these areas, preventing water seepage. To further enhance the concrete’s performance, two products—superplasticizer SH7 and concrete adhesive and additive N50—are incorporated into the mix for both the floor and walls.

Functions of Superplasticizer SH7:

1. Reduces the water-to-cement ratio, increasing the concrete’s strength for Waterproofing Concrete Tanks.
2. Improves workability without altering the water content, ensuring a smooth pour.

Purpose of Concrete Adhesive and Additive N50:

1. Serves as a waterproofing agent within the concrete mix.
2. Reduces permeability, boosting the waterproofing coefficient for Waterproofing Concrete Tanks.
3. Minimizes cracking risks and enhances durability during freeze-thaw cycles.

Waterproofing Concrete Tanks:

Concrete surfaces inside reservoirs often develop cracks due to shrinkage after drying, which must be addressed before applying a waterproof layer. To prepare a repair mortar, mix adhesive and additive N50 with a small amount of water, cement, and sifted stone powder. This mixture is used to repair cracks and areas with exposed aggregate.

For Waterproofing Concrete Tanks, sealing adhesive and resin Z90 are applied using Method 222.

Method 222:

(Solution A: One part sealing adhesive and resin Z90 + one part water)

1. Apply Solution A with a brush in two coats, allowing each layer to dry.
2. Mix one part cement with two parts sifted stone powder (micronized silica) and add to Solution A, creating a brushable slurry. Apply in two coats with drying time between layers.
3. Repeat the first step.

If Painting is Desired:

In the third step of Method 222, mix Solution A with three parts water-based acrylic paint for a finished look.

If Tiling is Required:

For tile installation, mix one part adhesive and additive B70 with three parts water, then add sufficient cement and sifted stone powder to create a suitable adhesive for Waterproofing Concrete Tanks.

Examples of Reservoirs Insulated by NSG Execution Team:

1. Waterproofing Concrete Tanks at Tarom Copper Factory, Zanjan Province.
2. Waterproofing Concrete Tanks for Bastam Municipality, Semnan Province.
3. Waterproofing Concrete Tanks at Ziai Hospital, Tehran University of Medical Sciences.
4. Waterproofing Concrete Tanks at Amir Alam Hospital, Tehran Province.
5. Waterproofing Concrete Tanks for Rasan Market Development Company’s drinking water reservoir.