Pipe, ready mixed, pavement groups stage Concrete Day at Colorado Capitol

Sources: American Concrete Pipe Association, Irving, Texas

Governor John Hickenlooper has proclaimed April 29 as Concrete Day in the state of Colorado, recognizing “the industry as important to further development in our state and the hard work, dedication, and efficiency of its employees … The industry is an important contributor to Colorado’s infrastructure and economy. We look forward to celebrating Concrete Day at the Capitol every year.”

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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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