Treatment of structural materials such as concrete or mortar - with water glass soln. and then barium chloride soln., so strength and corrosion resistance of materials are increased

摘要

The material is treated in situ to improve its mechanical properties and to increase its resistance to corrosive substances. The material is first exposed to an aq. soln. (a) contg. a surfactant, and an alkali silicate in which the molar ratio SiO2:M2O is 2-3:1, esp. 2.5-2.5:1, and M is an alkali metal. The material is next exposed to a soln. (b) of an alkaline earth metal cpd. (b1) in water or a mixt. of water and alcohol. Treatment in soln. (b) is pref. followed by a second treatment in soln. (a). Cpd. (b1) is pref. barium chloride; whereas the surfactant in soln. (a) is pref. an alcohol, esp. ethaethanol. Used for concrete, mortars, stones or bricks which are already in position, and which may have already been attacked by corrosive substances. The solns. (a,b) passivate the surfaces of structural materials and form an insol. coating increasing the strength and corrosion resistance of the materials.