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2014SumShotcreteEMag

Nozzleman Knowledge (a) (b) Seal Wear Band Shaft Wear Band Fig. 4: (a) Note tight conditions within sealed bearing assembly; (b) bearing shaft showing significant corrosion and wear The second step, flushing at the washout, is ishing grease, their proper operation is difficult time-sensitive. To be effective, concrete slurries to validate; a costly bearing assembly failure may must be flushed from bearing and seal surfaces be the first sign of an automatic lubricator mal- before they begin to harden. Stroke the pump in function. Additionally, lubricators are not pro- reverse and add grease until fresh, clean grease grammable to facilitate flushing during the exits all bearing surfaces. If this critical step is washout procedure. Pumps fitted with automatic missed even once, trapped concrete slurry res- lubricators must use the manual override feature idue can harden and clog grease replenishment to flush bearing assemblies during washout. channels within the bearing, making future greasing impossible. What if a Fitting Will Not Generic automatic lubricating devices are available and can be fitted to wet-mix pumps. Accept Grease? Unfortunately, these devices can provide a false At normal temperatures, all grease fittings sense of security. Although effective at replen- should readily accept grease. Wear, contami- Shotcrete Specifiers Education Tool, v2 The Shotcrete Specifiers Education Tool, version 2, is designed to provide specifiers with a better understanding of the shotcrete process and important components of a shotcrete specification. The content provided on this 4 gigabyte USB flash drive now includes: PowerPoint Presentations: Shotcrete for Repair and Rehabilitation of Concrete Structures and Shotcrete for Underground Construction Brochures: Sustainability of Shotcrete; Shotcrete, A Proven Process; and The History of Shotcrete by George Yoggy Video: Shotcrete Versatility Plus (World of Concrete Mega Demo) ASA Members: $25.00 each Nonmembers: $45.00 each To order, call ASA at (248) 848-3780 or visit www.shotcrete.org Shotcrete • Summer 2014 35


2014SumShotcreteEMag
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