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FAQ on Water Proofing(1) What is Negative Water Proofing system and why it is called so? (Ans) Normally, water proofing is done from outside of the buildings and the source of incoming water is closed, so that, water seepage is avoided. This is done through coating, like Polymeric and Elastomeric coatings etc. Some times, when plastering is loosened, this is also changed. There are some cases, where it is not possible for a single flat owner and some times even for the house owner to reach the water seepage point and block the seepage. The typical case may be taken for a multi-storied building, which is 20 floor high and in the 18th floor flat, there is a seepage. Some times, the source of water is also from the 19th floor toilets. In these cases, If the water seepage is stopped in to the walls of 18th floor flat, by doing the treatment, then the water proofing treatment done inside walls of 18th floor flat will be called as NEGATIVE WATER PROOFING. (2) What is the principal of Negative Water proofing? (Ans) Normally, the treatments done are with solvent base or other polymers, which does not make a proper film on the wet surface and in due course, the film comes out alongwith the paint and the area looks shabby. But, in SRL's Negative Water proofing system, first a coating of TOPCOAT-SFG is given which cures with the moisture content of the wall and takes a grip on the wall. However, before applying this coating, entire plaster and POP work must be removed completely and this coating is to be applied on the brick wall. After doing this, cement sand plaster with C-Max system of SRL is done and again on the plaster, POP is applied and after that, TOPCOAT-SFG may be applied and over that, other coatings should be used. (3) Whether the rain water enters into the walls? (Ans) Normally, the water coming from outside comes through the capillaries, created over a period of time and these capillaries will again bring water during rains. But, since in Negative Water Proofing system, the capillary is sealed, water will not be able to penetrate in the walls and where the weather is hot and it not rainy, the capillary is again emptied of water through evaporation. Some times, people ask, if there is a heavy rain, then weather the water will go. This can be better understood by giving an example of any object, like a Handkerchief. If there is a water and we put the Handkerchief, then to an extent this will be absorbed. but excess water will flow. Similarly, in case of walls, excess water will flow over the walls in normal course and go to the drains. To explain it in a still simple way, every porous object has moisture taking capacity depending on the porosity of the mass and once the pores are filled up, then excess water will flow out. (4) How effective is negative Water Proofing? (Ans) So far, initial work done are showing very encouraging results and the success. of negative water proofing will depend mainly on fine applications of the material and following the recommendations properly. (5) Can Negative Water proofing be used to prevent rising water damp? (Ans) Yes. Negative Water Proofing may be used to prevent rising water damp, but the job has to be done very meticulously, as explained and the height should be 5-6 from the plinth level, wherever the treatment is done. (6) What is C-Max and why it is called so? (Ans) C-Max is a newly developed polymeric additive for cement and it is called C-Max, because, it maximises the cement surface area and it makes use of each an every particle of cement for the purpose of its use. Cement is not only a binder, but also one of the best water proofing agents. Due to this binding capability, after manufacturing and during storage, the finer grains mingles with each other and give the cement a dense structure. Once the polymer, i.e. C-Max is added, each and even grain is loosened and the same cement occupies more area and this can be shown very easily in an experiment, taking two glasses of water, wherein, same quantity of cement is added. In one glass, add C-max as recommended, stir it and see the results for yourself. (7) Does C-Max reduce cement & water ratio? (Ans) Yes, C-Max helps in reducing the cement & water ratio and decreases the quantity of water by 30-40%. (8) If the cement surface area is expanding, will it swell the concrete mass or the plaster? (Ans) No, the addition of C-Max releases the fine grains of cement, which are coagulated and this action does not create any force. So, the question of surface area expansion or swelling does not arise. Through the sliding action of particles, increased surface area is absorbed in a mass. (9) Where does the expanded or maximized cement go in the mass? (Ans) If you see the structure of concrete or a cement & sand block or if you test the porosity of cement as per IS approved method, then you will find that, porosity level are as high as 35% in a concrete mass. This porosity only absorbs and retains moisture to give rise to problem of water seepage in due course of time. If you add C-Max then the cement surface area increases & penetrates in to all these pores and reduce the porosity, to a level of 3%. (10) What is meant by 3% porosity and what is the most ideal addition rate of C-Max and what happens, if more and less quantity is added? (Ans) The best example can be given by telling about the materials like, Marbles and Granites. Best of marbles have porosity between 5-8% and Granites have porosity between 2-3% and that is the reason, the water can not seep through Granites. But some times, it goes through the marbles. So, now, you can know that, 3% porosity achieved in a concrete mass, will affect the water proofing properties in what manner Most ideal rate of C-Max is 1.0% of cement. If more quantity is added, then looses its effect and you may not get the desired results, because the polymer once again act as adhesive and will have a negative effect by reducing area, instead increasing. Less than 1% addition rate, is also not good for the purpose of water proofing because, the porosity level will be higher ads expansion of surface area is to 30-40% instead of 80-100% at 1% addition rate. (11) Does the addition of C-Max affect the strength in any manner? (Ans) Strength of cement is directly proportional to the sand and metals used in the concrete. However, by adding C-Max, comparative strength will increase by about 10-15%. It will reduce the porosity drastically at 1% addition level as explained above. (12) Can you touch C-max with hand without any precautions? (Ans) Yes, C-Max is water soluble and water dispersible and it can be touched with naked hand. It is also chloride free. (13) Does C-Max helps in faster setting of cement? (Ans) Yes, it will help in faster setting of cement. Curing will be faster, as compared to normal cement used without addition of C-Max. (14) Does the expansion in surface area increase the volume of water? (Ans) No, increase in volume of water is directly proportional to the weight of cement put inside the water and later on, after addition of C-Max, the weight of cement is not increased. Only the surface area increases. So, there is no question of water level rising. Water proofing with 10 years guarntee at the prices less than CPWD rates |
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