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ASTM C01 examines alkali activated binder versus natural pozzolan testing

ASTM International Committee C01 on Cement is developing a standard to help create data for comparing the compressive strength of alkali activated fly ash and natural pozzolans. ASTM WK42602, Test Method for Compressive Strength of Alkali Activated Coal Fly Ash and Raw or Calcined Natural Pozzolan Cement Mortars (Using 2-in. or [50 mm] Cube Specimens), is under the jurisdiction of Subcommittee C01.13 on Special Cements.

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NCMA gauges thermal loading effect on CMU structural integrity

National Concrete Masonry Association staff is working on simplified fire loading finite element models, capturing the thermal effects of applied heat to concrete masonry units. The rudimentary models are being used to calibrate modeling/results to accurately capture the expected heat transfer response through individual units. Results will be extrapolated to larger wall assemblies, where simulated full-scale fire testing will be modeled and compared against existing physical test reports.

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Tindall helps federal prison achieve LEED Gold status

A precast wall system Tindall Corp. produced at its Petersburg, Va., operation contributes thermal efficiency to the Federal Bureau of Prisons’ first LEED Gold-certified facility: the new medium-security Federal Correctional Institution (FCI) at the United States Penitentiary site in Hazelton, W.Va. The 540,000-sq.-ft., multi-building complex is designed to support over 1,100 inmates while minimizing environmental impact and conserving resources.

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Report tracks minor gain in 2012 precast shipments, better 2013 prospects

After several years of stagnation, the precast concrete industry is turning the corner in recovery from the Great Recession, with the National Precast Concrete Association 2013 Benchmarking Report indicating 2 percent higher volume over the prior year.

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Rapid drying slab mix passes test toward timely school opening

Redi-Mix LLC, a business unit of U.S. Concrete, Inc., has delivered sustainable concrete to six Dallas Independent School District (Dallas ISD) projects, the mixes formulated for a net savings of 108.7 million lbs. of carbon dioxide emissions. The Billy Earl Dade Middle School also incorporated the producer’s Aridus Rapid Drying Concrete to address aggressive scheduling requirements in advance of a late-August opening.

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