HARJAI high pressure grout pump is designed for use in medium and large sized pre stressed concrete works. It is a hand-operated diaphragm unit and weighs only 9 kg. It is easily handled and particularly suited for working on scaffolding or where operating space is restricted. The pump produces a pressure of 10 kg/cm2 (140 psi) and delivers 400 liters of neat cement grout per hour of pumping. The pump is so designed that all working parts are readily accessible for easy maintenance.
ADMIXTURES: Research has confirmed that for basically horizontal tendons in rigid ducts, satisfactory quality of grout may be achieved without use of any admixtures. However, admixtures, if used should impart the properties of low water content, good flowing ability and minimum bleed. Its formula should contain no chemicals in quantities that may have harmful effect on the pre stressing steel or cement. Admixtures containing chlorides (as CI. in excess of 0.5 percent by weight of admixture) fluorides, sulphates and nitrates should not be used. If desired aluminum powder of the proper fineness and quality which is well dispersed can be used to obtain a 5 to 10 percent unrestrained expansion of the grout. All admixtures should be used in accordance with the instructions' of the manufacturer.