Waterproofing Concrete Structures with Nanocoatings

By AZoNano.com Staff Writers

Topics Covered

Introduction
Conventional Waterproofing Materials
Nano Protective Waterproofing
Waterproofing Solutions
Waterproofing of Bathrooms and Toilets
Conclusion
About Nanoshel

Introduction

Concrete blocks can absorb up to 22ltrs of water per sq. m., while cement structures can absorb more than 11ltrs per sq. m. in 6 hours during the wind-driven rain of 32km/hour. Rain water easily penetrates into structures and causes structural and aesthetic damages.

Cement tends to lose its strength due to a number of factors, such as carbonation, alkali silica reaction (ASR), freeze-thaw, cracking due to ductility loss and volume expansion, and corrosion of reinforced steel bars, as shown in Figures 1, 2 and 3.

Figure 1. Concrete ageing

Figure 2. Cracks

Figure 3. Corrosion

Conventional Waterproofing Materials

Traditional waterproofing materials and repellents usually form a surface film, which is susceptible to heat, abrasion and UV radiation and thus provide only short-term protection. In order to achieve long-term protection solutions, one needs a mixture of permanent silane modification of concrete with reinforced bitumen membrane.

Nano Protective Waterproofing

Nano protective waterproofing is a water soluble and chemically reactive product inspired by nature's nanotechnology. It is eco friendly, has 100% Organo Silane, penetrates up to 2mm into cementitious surfaces and concrete pores, and forms an impermeable monolithic membrane to prevent seepages. This breathable nanotechnology is resistant to UV and heat, and creates a Si-O-Si Siloxane bond by nano siliconization

Waterproofing Solutions

Some of the common problems encountered in buildings are leakages in toilets, bathrooms, walls, and terraces. This leads to dampness, which may cause fungus growth, create problems in electrical installations, and also create other unhealthy conditions for people living in the building. These issues can be addressed with appropriate waterproofing solutions.

However, waterproofing is a complicated process and small time contractors are not adept in handling this work, which demands a great deal of expertise. Other factors such as poor quality of sand, concrete, bricks, plumbing defects, etc. can cause leakage problems. In addition, materials utilized for waterproofing must be precisely employed in same quantities and proportions, as recommended by the manufacturer. Many contractors also compromise on the use of materials to save costs and make more profits on these materials.

Waterproofing of Bathrooms and Toilets

Figure 4. Gap between the jalli and the trap

Figure 5. These pockets in cylindrical portion must be plugged and removed with PMM.

One bathroom or toilet should be attended at a time. In case of bathroom, the nahani trap should be checked. Next, a tile jointing mortar should be used to seal all the tile joints. A gap is usually found between the trap and jalli (Figures 4 and 5) and this must be plastered. One must also inspect for cavities in these gaps.

Then, a polymer modified mortar should be used to re-plaster the entire cylindrical portion. This modified mortar is made with 1:2 fine sand mortar plus cement with 15% polymer additive by weight of cement. For Indian W/C, the joint between W/C pan and S trap should be sealed with mortar. Following this, an epoxy sealant must be used to seal the tile joints.

In case the above procedure fails to reduce seepage in two weeks, then the entire bathroom has to be opened up for waterproofing and tiling has to be done again. Another important factor is that the floor of the bathroom and W/C should be sloped away from the door towards the outlets.

In case of toilets, the loose mortar, nails, etc. must be removed before washing the toilet. Then, grouting should be done on all outgoing pipes, corners and junctions using Polyalk EP in the ratio 1:5:15. Following this, waterproofing must be done using polyalk WP in the ratio 1:1; this is applied in 3 coats with 1 coat per day.

After the third coat, allow it to set for 2 days. Then, finally cure the toilet for 3 days. Following waterproofing and grouting of outgoing pipes, water should be kept in the toilet for at least 24 hours in order to test it against leakages. In case, there is no leakage, water should be removed and backfilling needs to be done with PCC.

Conclusion

Leakages in bathrooms and toilets in a building create nuisance to occupants staying in the lower floor; however, such issues cannot be rectified immediately. This is because over the years, the joints between the flooring and door frame and joints between the tile and W/C pan allow the water to seep below.

Fortunately, this problem can be resolved without removing the pans or tiles. Nano Protective Waterproofing with penetration up to 2mm provides a suitable solution in addressing these problems.

About Nanoshel

NANOSHEL makes more than 50 types of products, among which the main products are nanotubes, SWCNT's, MWCNT's, and nanoparticles. These products are widely used in the fields such as textile industry, ceramics, chemical fiber, plastics, coatings, cosmetics, rubber, electrical and electronic equipments, electric power generation and boiler and so on.

Through providing the customers with nanomaterials and the application process solution, the company commits itself to assist clients to improve the functionality and technology content of the products so that the clients can promote their product added-values and market competitive competencies, keep their creative advantages for a long time in the concerned fields and make good economic benefits.

This information has been sourced, reviewed and adapted from materials provided by Nanoshel.

For more information on this source, please visit Nanoshel.

Date Added: Oct 22, 2013 | Updated: Oct 23, 2013
Ask A Question

Do you have a question you'd like to ask regarding this article?

Leave your feedback
Submit