Case in point for water tanks
This case/solution is valid for drinking and non-drinking water tanks either with new or old concrete. In both case, a waterproofing system needs to be applied to protect the concrete and prevent ant leakage of the contained liquid.
SOLUTION
Substrate preparation
The cement base products are ideal for this application especially for drinking-water tanks and in case of positive or negative pressures; the following steps are to be considered:
Surface preparation
Remove dust, oil and any remainders by using grinders and fresh water only; all substrate must be sound and clean.
Joints treatment
All joints between vertical walls and ground must be treated by creating a groove of 2 cm deep and 2 cm wide; the groove is to be cleaned and damped with fresh water then filled with weber.dry 150 BLC. In order to protect the filled joint, weber.rep 331 TX is to be applied on the 90° corner in a round shape and in an appropriate thickness.
Honeycombing 
In some new built water tanks, honeycombing may be found occurred by concrete pouring or pumping. Honeycombing areas must be cleaned by removing all damaged concrete and existing laitance and the damp the concerned areas with water and use weber.rep 350 NSG for filling the cracks.
Big holes and damaged concrete
In the case of big holes or damaged concrete in old or new water tanks, all damaged areas must be chiseled, cleaned and damped with fresh water. Weber.rep 331 TX is to be applied in one or two layers depending to depth of holes.
Presence of holes 
Mostly in new built water tanks, holes will appear caused by molding or else; such holes must be clean and damped. Use weber.dry 150 BLC – the plugging mortar and keep it moist for a period of 15 min. If any cracks are present, they can be treated the same way.
PRODUCT SOLUTION
WATERPROOFING
After assuring that all the above steps have been maintained, the water tank is ready to receive the final product in the cement waterproofing system, weber.dry 110FX – the flexible high performance product is to be used in 3 layers:
- 1stlayer with sufficient thickness 1kg/m²:
– Use a brush or a roller
– Fix 20 cm width of fiber mesh on all corners, joints and cracks while the concrete waterproofing layer is still wet. - When dry, apply the 2nd and 3rdlayer in proportions of 0.5-1 kg/m².
SODAMCO is a manufacturer and marketer for quality construction chemicals products applied in the construction and building industry. These are built to the industry standards and specifics for climatic conditions. The company is based in Lebanon and has over 20 years of experience in the undertaking.
