FLS, Aalborg Portland deploy nanotechnology for reduced-carbon powder process

A Danish effort to develop process technology for the production of high-quality, environmentally friendly cement has been launched through a DKK15 million [US$2.5 million] National Advanced Technology Foundation grant. The four-year effort targets formulation, through nanotechnology methods, of new types of reactive supplementary cementitious materials, plus development of process technology needed for large-scale SCM production based on locally available raw…

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EPA Weighs Fly Ash Concrete Stigma Vs. Broader Coal Ash Hazardous Waste Label

In its proposed regulation of power plants’ coal combustion residuals (CCR) under the Resource Conservation & Recovery Act (RCRA), EPA acknowledges potential backlash a hazardous waste designation might have on beneficial uses of concrete. The agency’s Federal Register posting (above item) cites a letter from December 2009—then a working deadline for proposed rule publication–wherein ASTM Committee C09 officers “indicated that…

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Feds Place Three Cemex Plants in 2010 Energy Star Ranks

The U.S. Environmental Protection Agency and U.S. Department of Energy have awarded the 2010 Energy Star to Cemex USA cement plants in Clinchfield, Ga.; Louisville, Ky.; and Demopolis, Ala. Over the last year, the plants conducted compressed air system surveys to identify leaks; installed more efficient motors; completed staff energy-training programs; upgraded lighting systems with motion sensors; increased the use…

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Author Traces Rediscovery of Great Pyramid-Era Binder

A new book describes a silicate rock, made without heat or pressure, as a potential aggregate-binding substitute for portland cement in a range of building and infrastructure concrete conditions. The Great Pyramid Secret: Egypt’s Amazing Lost Mystery Science Returns claims the artificial rock, when mixed with aggregates, “forms concrete that has fooled geologists,” and concludes that the silicate compound represents…

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Iceland engineers confirm volcanic ash’s binding, AAR-quelling properties

The International Centre of Research and Applied Technology for Alkali Aggregate Reactions has confirmed AAR-mitigating potential in ash from April’s Eyjafjallajökull volcano eruption, crediting the material’s particle fineness and approximately 60% silicon dioxide content. Using methods from ASTM C 1260 Multi-Laboratory Study of the Accelerated Mortar Bar Test for Alkali-Silica Reaction, staff at the Mannvit Engineering-housed facility prepared specimens from…

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