In this process certain compounds are added along with concrete or mortar while mixing which when used in construction act as barriers to moisture penetration.
The added materials function based on different principles. Based on the mechanical principle, materials like chalk, talk, fullers earth, etc., fill in the pores present in the concrete or mortar and make the concrete or mortar and set as a waterproofing agent. Based on the chemical reaction principle, the materials like alkalines, silicates, aluminium sulphates, calcium chloride, etc., react chemically as water-resistant. Based on the repulsion principle, the materials like soaps, petroleum oils, fatty acid compounds such as stearates of calcium, sodium, ammonium etc., which when added with concrete or mortar react with it and become water repellent.
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