GB572817A - Cement compositions and method of producing same - Google Patents

Abstract

A soap of a pine wood resin which is substantially insoluble in petroleum hydrocarbons is mixed with cement, mortar, gypsum plaster, lime, puzzolana, or the like either as a grinding aid during manufacture or immediately prior to mixing. This is stated to produce a reduction in specific gravity, to facilitate grinding, mixing and positioning, to reduce water-absorption, and to increase resistance to attack by weather conditions and de-icing chemicals. The resin is obtained by treating pine wood, after extraction of the turpentine and pine oil, with a coal-tar hydrocarbon, and treating the residue with a petroleum hydrocarbon such as gasoline or with a mixture thereof and furfural. The petroleum-insoluble resin is separated and is saponified either by the hot or cold method. Preferably, the pulverized resinous material is dispersed in cold water by means of a small proportion of alkali, a solution of casein in sodium hydroxide, sodium oleate, sodium alginate, sulphonated higher alcohols, sulphonated naphthalenes, or bentonite, or by mechanical dispersion, and concentrated alkali solution is then added; alternatively, the dry resinous material may be added to the alkali solution. The saponified material may be used in proportions of from 0.005 to 0.30 per cent, and preferably about 0.04 per cent by weight of the cement.