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The resistance to atmospheric deterioration of fresh portland cement can be increased through the use of small amounts of interground oleic acid. Laboratory tests have demonstrated that the addition of from 0.1 to 0.4 per centoleic acid decreases the effort required during finish grinding of cement; that a more deterioration-resistant fresh cement will result; and that if the airentraining tendencies of portland cement so treated are controlled, the resultant mortars and concretes are similar to those obtained using untreated cements. A suitable air-detraining agent is tri-n-butyl phosphate. This airreducing agent may be either inter-ground or added at time of mixing. The study indicates that the cost of materials for adequate treatment would be less than 10 cents per sack.
Materials Engineer, Research Dept., U. S. Naval Civil Engineering Research and Evaluation Laboratory, Calif.