Masonry Magazine March 2011 Page. 22
MIXERS, PUMPS AND DELIVERY SYSTEMS
"higher flexural psi, workability, excellent bonding, freeze-thaw protection, easier pumping, high-range water retention and maximum ASTM C-494 and C-260 requirements" (Kel-Crete Admixture).
When batching onsite using a high-strength grout or mortar, be sure to evaluate the aggregate size, first and foremost, to ensure that the mix does not include aggregates more than 3/8-inch minus. Also, test the material by squeezing a small amount of material in your hand; it should all squeeze out between your fingers and leave no aggregates or clumps. All mixtures
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READER SERVICE #281
FILL BLOCK WALLS WITHOUT A CONCRETE PUMP OR FORKLIFT
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READER SERVICE #296
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Grout hoses in use must be slick to pump through the grout pump, material line and hose. If not slick, the material could clog the hose.
Large clumps caused by dried materials could also clog the pump or material hose. The addition of more fines (sand) to suspend aggregates, cement, plasticizer or lime also could improve the material mixture. Pay close attention to water content in the mixture, and ensure it does not separate out from the other materials. Too much water can, depending on the material, cause sand to separate from cement, preventing the material from performing its function as structural reinforcement in the core filling process.
Priming the pump
MASON CONTRACTORS interested in using a grout pump for grouting walls should be aware of all recommended procedures for setting up the grout pump on a job. Most of these procedures are fairly basic. One procedure-priming the pump-is especially worth mentioning. For masonry grouting and mortar pumping (especially when using 3/8-inch minus pea gravel in the mix), it is crucial to prime the pump and hose before starting the job.
Priming involves the following simple steps:
1. Elevate the end of the material hose higher than the top of the material hopper, while pouring water into the hopper and pumping it through the entire pump and length of hose
2. Drain the water by lowering the material line down lower than the pump discharge (outlet)
March 2011 www.masoncontractors.org
The Voice of the Masonry Industry