To make concrete water resistant, it should be made as very condense dense and does not contain cracks. Concrete can be made condensed with the following ways :-
The cement concrete to a specific extent may be formed impervious to the water with hydrophobic cement. In the recent time, most of the flat roofs are built up with R.C.C. Therefore, it is essential to arrange some treatment of waterproofing to such roofs.
Process for waterproofing concrete
Given below, some useful processes undertaken for waterproofing of R.C.C. flat roofs:
Finishing
For ordinary buildings which are made with cheap construction, the finishing of roof surface is prepared while placing cement concrete. The finishing of flat roof is accomplished in cement mortar with ratio 1:4 i.e. one part of cement to four parts of sand by volume.
Bedding concrete and flooring
Under this process, the surface of R.C.C. slab is retained rough and a layer of concrete is placed on this surface. The concrete may come in the form of brickbats lime concrete (1:2:4) or brickbats cement concrete (1:8:14). The density of the concrete layer is approx 100mm. The surface of the bedding concrete is made with appropriate flooring like tiles, terrazzo, Indian patent stone, etc. A convex joint is arranged at the meeting point of parapet wall and roof.
Mastic asphalt and jute cloth
Under this method, a layer of hot mastic asphalt is placed on the roof surface. The jute cloth is extended over this layer. Afterwards, another layer of mastic asphalt is utilized to oppress the jute cloth among the two layers of mastic asphalt. The sand is then sprayed over the whole surface of roof. To grip more efficiently, the lead sheets are included at the meeting point of parapet wall and roof.
Apply water resistant compounds
Some of the water resistant compounds like Pudlo, Impermo, are very useful as when these compounds are provided to the cement throughout construction, it resists seepage, leakage and damp resulting from the capillary absorption of the moisture in cement, mortar and concrete. Only 2% of water-proofing compound is required. Therefore, approx 10N of such compound is needed for a bag of cement.
The water-proof compounds come in the powder form and they should be blended comprehensively with cement manually prior to the cement is blended with the aggregate.
Article Source : https://www.onlinecivilforum.com
- Utilize high class portland cement with standard quality.
- Ensure that the grading and proportioning of the sand, aggregate and cement are accurate.
- Utilize clean and non-porous aggregate.
- Apply the exact amount of water for blending all the materials uniformly.
- Be cautious for placing, tamping and curing.
- Apply appropriate water-proofing compound.
The cement concrete to a specific extent may be formed impervious to the water with hydrophobic cement. In the recent time, most of the flat roofs are built up with R.C.C. Therefore, it is essential to arrange some treatment of waterproofing to such roofs.
Process for waterproofing concrete
Given below, some useful processes undertaken for waterproofing of R.C.C. flat roofs:
- Finishing
- Bedding concrete and flooring
- Mastic asphalt and jute cloth
- Use of water-proofing compounds
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Finishing
For ordinary buildings which are made with cheap construction, the finishing of roof surface is prepared while placing cement concrete. The finishing of flat roof is accomplished in cement mortar with ratio 1:4 i.e. one part of cement to four parts of sand by volume.
Bedding concrete and flooring
Under this process, the surface of R.C.C. slab is retained rough and a layer of concrete is placed on this surface. The concrete may come in the form of brickbats lime concrete (1:2:4) or brickbats cement concrete (1:8:14). The density of the concrete layer is approx 100mm. The surface of the bedding concrete is made with appropriate flooring like tiles, terrazzo, Indian patent stone, etc. A convex joint is arranged at the meeting point of parapet wall and roof.
Mastic asphalt and jute cloth
Under this method, a layer of hot mastic asphalt is placed on the roof surface. The jute cloth is extended over this layer. Afterwards, another layer of mastic asphalt is utilized to oppress the jute cloth among the two layers of mastic asphalt. The sand is then sprayed over the whole surface of roof. To grip more efficiently, the lead sheets are included at the meeting point of parapet wall and roof.
Apply water resistant compounds
Some of the water resistant compounds like Pudlo, Impermo, are very useful as when these compounds are provided to the cement throughout construction, it resists seepage, leakage and damp resulting from the capillary absorption of the moisture in cement, mortar and concrete. Only 2% of water-proofing compound is required. Therefore, approx 10N of such compound is needed for a bag of cement.
The water-proof compounds come in the powder form and they should be blended comprehensively with cement manually prior to the cement is blended with the aggregate.
Article Source : https://www.onlinecivilforum.com
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