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Mine tunnel’s lightweight mix expedites extraction schedule

Elemix concrete additive, an engineered lightweight synthetic particle (LSP) that uniformly reduces the weight of concrete, was used in a backfill mix for a 1,700-ft.-long, 26-ft.-wide mine slope built by Arch Coal, Inc. in Grafton, W.Va. The new Leer Mine will be a world-class underground facility, with projected annual output of 3.5 million tons of premium metallurgical coal.

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Drum-mounted probe exhibits increasing potential to trump cone test for slump

After four years of development and mixer fleet installations in 17 countries (and counting), the drum-mounted IBB Rheological Probe is shaping up as an alternative to conventional slump and spread testing. The device uses principles similar to a rheometer: Movement of an “impeller” within the concrete load at different speeds creates a flow curve that can be used to gauge viscosity and yield stress—the true behavior of fresh concrete. Most importantly, workability can be accurately estimated on a wide range of slump values by using a calibration with the load measured at low drum speed.

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Bagged mortar squeezes out waste in due course

Unit masonry and precast product developer and licensor Concrete Results Inc. recently announced the addition of TrueMortar, a modified portland cement-based formulation packaged in a patented applicator bag for speed and accuracy. With next generation additives and modifiers to impart workability, performance, and an attractive cost/productivity ratio, TrueMortar affords an alternative to the conventional process of concrete block laying and bonding.

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Case F series meets Tier 4 Interim standards with SCR technology

Case Construction Equipment introduced its 621F wheel loader model at the World of Concrete 2012 in Las Vegas earlier this year. The new vehicle provides up to a 10 percent increase in fuel economy over the previous model, while delivering faster acceleration, quicker cycle times and higher travel speeds.

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Once around The-Block

With more than 25 years of experience, the makers of The-Block system believed they could make a substantial improvement in the modular block industry.

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