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NIST spells role of ground limestone in optimizing mixture paste content

Sources: National Institute of Standards and Technology (NIST), Gaithersburg, Md.; CP staff

Keen on lower carbon alternatives to portland cement-only binders, the U.S. Department of Commerce-backed NIST has published Technical Note 1906, Minimizing Paste Content in Concrete Using Limestone Powders – Demonstration Mixtures. Researchers cite target performance levels in concrete mixtures with up to 28 percent lower portland cement content using a binary blend with limestone powder.

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ASTM Committee on Vehicle-Pavement Systems ponders sidewalk smoothness standard

Sources: ASTM International, West Conshohocken, Pa.; CP staff

ASTM Committee E17’s proposed WK41917, Practice for Computing Pathway Roughness Index from Longitudinal Profile Measurements standard describes a method to collect and analyze sidewalk slab roughness data. Roughness can make sidewalks uncomfortable and risky for wheelchair and wheeled-walker users, parents pushing strollers and postal carriers with three-wheeled carts, the committee contends.

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Heidelberg maps Italcementi integration for home turf, mum on North America

Sources: HeidelbergCement AG, Heidelberg, Germany; CP staff

iLab 150Advancing a proposed merger with mid-year target, HeidelbergCement Chairman Dr. Bernd Scheifele announced plans to restructure Italcementi S.p.A. operations, principally at its Bergamo, Italy, headquarters and affecting upward of 400 employees through 2020; consolidate global technical activities at Italcementi’s i.Lab Research & Innovation Centre, a Bergamo facility opened in 2013; and, maintain the Italcementi brand plus homebased plants and industrial network.

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