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Asphalt group: Underride guard rule unworkable in current dump trucks

Sources: National Asphalt Pavement Association (NAPA), Lanham, Md.; CP staff

While the National Ready Mixed Concrete Association cites cost and weight concerns surrounding prospective changes NHTSA outlines in “Rear Impact Protection, Lamps, Reflective Devices, and Associated Equipment, Single Unit Trucks,” NAPA sees new underride guard specifications fundamentally altering members’ truck and paving machine fleets.

 

Read more: Asphalt group: Underride guard rule unworkable in current dump trucks

Researchers eye reverse calcination for reduced-carbon cement production

Sources: University of California, Los Angles; CP staff

Targeting lower net carbon dioxide emissions in portland cement milling, University of California, Los Angeles researchers propose introduction of calcium hydroxide, or hydrated lime, at the calcination phase, when high temperatures split limestone raw feed into CO2 gas and calcium oxide. Lab-scale tests in their National Science Foundation-backed investigation indicate the potential to sequester CO2 and recreate limestone in a continuous loop.

Read more: Researchers eye reverse calcination for reduced-carbon cement production

Report touts geopolymer binders’ potential as portland cement substitute

Source: Technavio, London; CP staff

The authors of a global geopolymer market profile project compounded annual growth rate of more than 30 percent from 2015–2019, attributing among drivers increasing geopolymer cement acceptance in concrete for offshore and transportation structures.

Read more: Report touts geopolymer binders’ potential as portland cement substitute