TREATMENT OF CONCRETE FLOOR

PROBLEM TO BE SOLVED: To stagnate a small amt. of an aq. sodium silicate soln. on the surface layer of a concrete floor so that an efficient surface treatment is executed by spraying water on the concrete floor, then drying the surface, and further, spraying the aq. sodium silicate soln. thereon and washing the surface with water. SOLUTION: (A) The water is sprayed on the concrete floor 1 in such a manner that the water penetrates sufficiently down to the lower layer 2 of the concrete by exceeding the depth D (for example, about 5mm) from its surface. (B) Only the floor 1 surface is forcibly dried by a fan 3. (C) Next, if the aq. sodium silicate soln. is sprayed with a funnel 5, the aq. sodium silicate soln. does not penetrated into the water satd. part 2 of the lower layer of the surface. The spraying amt. of 0.4 liter/m suffices as compared with 30 liter/m of the conventional method. The calcium silicate floor surface layer 1 which is relatively hard and is stable to acids and alkalis is formed by reacting with the calcium hydroxide when the aq. sodium silicate soln. 4 penetrates the dry concrete layer. The sodium hydroxide soln. oozing on the surface as a by- product is removed by washing with water.