- Why concrete leaks?
Concrete is porous in nature. But not all cracks will lead to immediate leakage. The cracks inside concrete can be classified into three types as depicted: 1) Cracks do not open to the water side (the white cracks in the picture); 2) Cracks open to the water side but not to the other side (the blue ones in the picture; 3) Cracks form a channel from one side to the other side (the red ones).
Three types of cracks in concrete
2. Why is Robust Self-healing Waterproofing technology called smart waterproofing technology?
With a thorough understanding of concrete’s chemistry and physics, Robust Waterproofing Inc. developed a unique, proprietary self-healing ‘catalyst’ blends. The active ingredients in Robust Waterproofing agent use water as transportation medium to enter the crack and capillaries of the concrete, promoting the formation of non-soluble crystalline and gel structure, blocking the moving of liquid water in any direction (all the cracks in red and blue). The active ingredients will become dormant after the concrete dries up. If new type 2 (similar to the blue ones in pictures)and/ or type 3 cracks (similar to the red ones in pictures) formed by settlement near to the area applied with Robust Self-healing Waterproofing products, the active ingredients will be reactivated by water ingressed, move toward the new crack areas, and promote the formation of new crystals and gel.
3. Why the effect of Robust Waterproofing products is permanent?
The unique proprietary chemicals in Robust Waterproofing diffuse to the cracks and capillaries area filled with water, promoting the formation of water insoluble inorganic crystals and gels inside, blocking the ingression of water. As the crystals and gels grow inside the concrete and is water insoluble and inorganic, it has the same life span as the concrete matrix itself. scratching, grinding, or even complete removal of the initial waterproofing coating on the concrete surface has no adverse effect on the waterproofing effect after the waterproofing coating is properly cured.
4. Can Robust Waterproofing products used in cracks of all sizes?
Yes. Robust Waterproofing could be used crack of all sizes. However, for difference crack width, different procedures are needed to achieve optimum results. Robust Waterproofing products could seal any cracks up to 0.4 mm to 2 mm automatically. For surface cracks wider than that, it is necessary to open up the crack for better waterproofing effect.
5. Why membrane waterproofing is prone to fail?
Continuity is the key for the effectiveness of membrane waterproofing. Anything wrong with installation may lead to leakage. Puncture, tear, and plant roots, animal, traffic，aging, oxidation can all lead to failure of membrane waterproofing.
A right membrane waterproofing include the correct installation of:
- waterstop angles,
- perimeter flashings,
- vertical flashing angles,
- pressure strip flashings,
- chased drop flashings,
- fillets and bond breakers at coves,
- control joints,
- drainage flanges,
- cavity flashing down turns,
- topping screeds for falls for drainage,
- reinforcing at junctions,
- overflow devices,
- linear strip drains and
slip joints over suspended sheet flooring systems.
6. Can Robust Waterproofing technology prevent ASR damage of concrete?
Yes. Three elements are needed for ASR to occur: Alkali, reactive silica aggregates and water. Measures can be taken to minimize ASR to reduce alkali and reactive aggregate but there measures are always limited by availability and economy. And is not practical to remove any alkali or aggregate for existing concrete. Robust Waterproofing products can control the ingress of water, and hence, prevent the development of ASR.
7. How is the cost of crystalline waterproofing technology compared with other waterproofing technology such as membrane, polymer injection, drainage system?
General speaking, the cost of waterproofing for the same project increases in the following order: Cementitious waterproofing, polymer injection, membrane, drainage system. As membrane has to be installed outside of the building, to install membrane for existing building can be more expensive than installation drainage system inside the building.
8. How is drainage system compared with Robust Self-healing Waterproofing system?
Drainage system is used to avoid flooding, not to keep the concrete wall dry, not to stop the deterioration of concrete wall. It is not a good waterproofing system for regular poured concrete basement. However, for basement made from low quality concrete block or cinder blocks，there may be too many weak points for other conventional waterproofing methods.
Drainage system fails when the water table gets too high, when sump pump fails and when the pipe clogs.
9. What are the advantage of Robust Self-healing Waterproofing system over epoxy and polyurethane injection?
In most cases, Robust Waterproofing Self-healing system is better than both epoxy and polyurethane. Both epoxy and polyurethane injection can only seal up the cracks that CONNECTED to the injection holes. Any other cracks will remain the untouched. Injection may stop the current water leaking, but water will find another shortcut to get into your basement and continue to do damage to your concrete structure. Only with Robust Self-healing Waterproofing technology, can all leaking potential be eliminated and give the owner a peaceful mind.
As Robust Waterproofing systems are designed to work on cement specifically, for non-cementitious structure or for sub-standard concrete structures which do not have enough cement when the concrete was cast, polymer injection could be a good option under some circumstances.
If the crack patterns inside the concrete are very simple, and by chance epoxy and polyurethane fill them all up, you are absolute lucky.
The map pattern cracks caused by ASR on concrete could only be prevented by Robust Self-healing Waterproofing system.