By applying paints, fixing bitumen or internally by suitable design of concrete mix Mortar at the time of mixing, adding admixture in the concrete and also providing water bars at the joint can be done to prevent the the water in the concrete. This process is also called as waterproofing of the concrete.
As per the standard codes the design material and workmanship should be relevant.
Concrete Waterproofing Admixtures
a) In concrete: this type of waterproofing can be done by bye as per the manufacturers specification for the project.The method of application of admixture and other details is based on the manufacturer’s specification.
b) Plaster: firstl the concrete surface is cleaned and then plastered truly and stay as it is for 24 hours. Plaster in the cement sand Mortar mixed should be in the praporation of the 1:1 to 1: 4 by volume and suitable waterproofing admixture should be added and laid, and for the layers exceeding 15 mm or as per manufacturer's specification. The curing should be done for or minimum of 14 days period.
Bituminous or tar coating can be used for waterproofing of concrete.
Hot coal tar is used as per IS:216 and should not heated above 375 °F before the surfaces sandpaper and cleaned. After the first coat is dried second coat should be applied in the same manner as per the first coat where coal tar should not be less than 1.25 kg per metre and for Asphalt 1 kg per metre square.
Before second coat is dry sand is spread on the the the surface of it to cover it completely. Backfilling should be done in the the mean time in order to to allow the final code to dry entirely.
Bitumen Felt : Application for Tanking
For waterproofing on the outside and inside of the wall bitumen felt can be used.
The material for this method should be as per IS:1322 and workmanship should be IS: 1609.
The fibre base vitamin failed should be used as specified in in drawing for scheduled of items. Specialised firms are generally use this type of waterproofing methods.
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