David de Garis will retire as branch manager of Columbia Concrete Block Machine Australia in July, capping a nearly four-decade career with Columbia Machine Inc., Vancouver, Wash. He will assist in a leadership transition over the next five months. Concurrently, Columbia Machine has appointed Nigel Butler to the new position of CCBM Australia general manager. He arrives with extensive experience…

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Natural pozzolan exhibits cement-optimizing capacity in block and paver mixes

47 Savings

In a follow up to a November 2013 report on Active Minerals’ Acti-Gel 208, “Rheology modifer, anti-settling agent suits zero slump to SCC mixes,” Concrete Products examines the natural mineral additive’s latest application: Replacement of up to 30 percent of cement in concrete block and paver mixes, netting potential cost savings up to $0.02/unit.

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