Cement and concrete research vol:29 issue:6 pages:867-872
Injection grouts made of cement and mineral additives, such as lime and natural or artificial pozzolans, coagulate in suspension; the use of a superplasticizer is not sufficient to improve injectability when penetrability in very fine voids is required. The effect of two different mixing procedures, one with a mechanical and one with an ultrasonic mixer, has been studied. Ultrasonic mixing improves dispersion, especially when silica fume is added to the grout, and permits the use of a water content lower than that of high turbulence mixing for the achievement of the same penetrability of the grout. (C) 1999 Elsevier Science Ltd. All rights reserved.