Water/cement ratio is very important term in concrete technology as a optimum water content produced high strength than a W/C that are not specified from mix design considering aggregate grading, its moisture content and other conditions like environment ( very cold or hot weather). Some high-range water-reducing admixtures have a shortlived effect on the slump of concrete. Therefore, it is expected that these materials will be dispensed as close to placing time as possible. For ready-mix operations, this might mean the use of a truck-mounted dispenser in the form of a calibrated storage tank. The tank will be charged with the admixture at the same time the concrete is loaded. The user can request an increase in slump by injection of a HRWR admixture, and the driver will dispense the required amount into the turning drum. The volume dispensed will be recorded on the delivery ticket. The injection should be performed under pressure through a spray nozzle to thoroughly disperse the admixture into the drum. Field dispensers, consisting of a measuring unit and pump, can be used at the site.
|Truck-mounted Dispenser of Admixture|