Concrete Products

NOV 2017

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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Page 50 of 63 November 2017 • 49 FEATURE ENVIRONMENTAL AWARDS WESTERN REGION SECOND PLACE CENTRAL CONCRETE SUPPLY CO. QUEENS LANE PLANT • SAN JOSE, CALIFORNIA Central Concrete's home base workhorse runs one wet and one dry plant. The Queens Lane facility is in the middle of a highly industrialized area of San Jose bearing little to no naturally occurring trees or shrubbery. Upon acquiring the facility in 1999, the producer preserved large redwood and big-leaf maple trees and designated about 6,500 sq. ft. of ground cover and shrubs as a buffer between the plant walls and surrounding sidewalks and streets. As an NRMCA Green-Star Certified plant, Queens Lane utilizes an environmental management system covering operational aspects from hazardous materials handling and stormwater collection to dust control measures and Occu- pational Safety and Health Administration inspections. Staff relies heavily on the EMS to maintain compliance with all federal, state and local regulations, while man- agement treats system parts as iterative processes with quarterly inspection, improvement and action cycles to ensure the plant remains ahead of the curve. An annual training program covers the gamut of envi- ronmental and safety factors at Queens Lane and sister northern California sites, including spill prevention control and countermeasures, hazardous material/waste handling and storage, stormwater pollution prevention, plus injury and illness prevention. Monthly training sessions are tailored to yard staff, operating engineers and concrete delivery professionals. Queens Lane employees and peers from other Central Concrete sites participate in an annual fundraiser, the Northern California Special Olympics Plane Pull, where teams compete to move nearly 76,000 lbs. of military C-130 craft the farthest in a target time. Concrete mixer trucks have been deployed in past pull events. Central Concrete's adoption of carbon dioxide-sequestering methods from Halifax, Nova Scotia-based CarbonCure Technologies prompted a recent Queens Lane plant visit from Canada's Minister of Environment and Climate Change Catherine McKenna and a California Governor Jerry Brown delegation. Attendees learned how the CarbonCure technology sources carbon from local industrial emitters and converts the greenhouse gas into nano-sized minerals designed to create a stronger, greener concrete. Central Concrete equips Queens Lane as a zero discharge facility. Managers and staff strive to contain and reuse all process water and harvest rain water for dust control, irrigation, plant housekeeping and batching concrete. An above ground tank (right) moves process water from settling ponds back to the reclaimer and chiller. When stabilizing returned concrete to ASTM C1798 specs for use in a forthcoming order is not an option, Queens Lane drivers turn to twin con- crete reclaimers (above) to separate coarse and fine aggregate and transfer water to a chiller- equipped, 25,000-gal. tank. Once it reaches spe- cific gravity and temperature targets, process water is recycled in concrete mixes or for truck washout and other yard maintenance.

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