DELVO? Advanced Admixture Technology for Cement Hydration Control

DELVO? admixture technology from BASF Admixtures, Inc. is a unique and cost-effective method for addressing the environmental concerns pertaining to concrete washwater pits and washwater disposal. Developed over 20 years ago, this innovative, patented technology allows concrete producers the ability to implement a zero waste management program.

At the end of the day, an empty ready-mixed truck can contain approximately 600 lb (356 kg) of concrete, adhering to the inside of the truck drum. Typically, 150 – 300 gallons (570 – 1,140 Liters) of water is used to clean the inside of the mixer drum. This water is then disposed of into a “washwater pit” or a slurry retaining bin. Over time, this procedure creates disposal and environmental issues.Applications:Stabilization of Concrete Washwater: Treating the washwater in the truck drum with DELVO admixtures stabilizes the concrete washwater, effectively stopping the cement hydration process. This allows the washwater to be reused as mix water in concrete production the next day or after a long weekend. Concrete containing stabilized washwater will experience equal or greater strength performance compared to concrete without stabilized washwater. Sameday Stabilization of Returned Plastic Concrete: By providing greater control of the cement hydration process, DELVO admixtures allow for the reuse of returned plastic concrete that has been stabilized for minutes or even hours. This reduces the disposal of returned concrete, expensive labor costs, and excessive wear and tear on front-end loaders, and costly hauling charges.Stabilization of Freshly Batched Concrete for Long Hauls: Any delay in concrete batching, transportation or placement beyond a certain cement hydration point can result in substandard concrete due to loss of slump, workability, and finishability. DELVO admixture technology can be added to the freshly batched concrete in order to put the concrete “to sleep” for a desired period of time. Since hydration is temporarily stopped, no heat is generated and therefore, slump is retained. At the end of the stabilization period, cement hydration occurs exactly as if the concrete was just batched. BASF Admixtures offers two ready-to-use products utilizing DELVO admixture technology — DELVO Stabilizer, a liquid formulation and DELVO ESC, a dry formulation. Both products meet ASTM C 494 requirements for Type B (retarding) and Type D (water-reducing and retarding admixtures). BASF Admixtures, Inc. conducted a joint study with the US Army Corps of Engineers and developed a report (CPAR-SL-95-2, December 1995) on the evaluation of applications of DELVO admixture technology. A copy of the final report can be obtained by contacting your local BASF Admixtures sales representative.For more information on DELVO admixture technology, please contact your local BASF Admixtures, Inc. representative or call 800-628-9990.
(Remember to login to to download documents) DELVO? STABILIZER – Hydration Controlling Admixture – LiquidDELVO? STABILIZER Material Safety Data Sheet DELVO ESC – Hydration Controlling Admixture – Dry FormulationDELVO ESC Material Safety Data Sheet

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