Technology shears cost of grinding fly ash to match silica fume performance

Sources: CP staff; IgniteIP, New York

By Don Marsh

A New York investor announced at World of Concrete (January 18–21, Las Vegas) technology economizing the grinding of fly ash, or secondary grinding of portland cement, to 3- or 1-micron median particle sizes. With $30–75/ton processing plus $20–100/ton raw feed (fly ash, Type I/II portland cement) costs, the technology can yield premium binding agents whose performance properties in concrete and grouts match those of ultra-fine high-reactivity metakaolin or silica fume—typically commanding $300–$700/ton.

Read More

Technology, training reinforce 2011 Precast Show

Sources: National Precast Concrete Association, Indianapolis; CP staff

After three years of recession, the construction industry enters 2011 marked with signals of stability, followed by recovery and prospective robust conditions toward mid-decade. The industry poised to emerge will be leaner and greener than ever, contends NPCA, sponsor of the 2011 Precast Show, January 25–29 in Charlotte, N.C.

Read More

Grace acquires RS slump-monitoring technology

Source: W.R. Grace & Co., Cambridge, Mass.

W.R. Grace & Co. has closed on the assets and associated entities of RS Solutions LLC, a West Chester, Ohio, developer of process control solutions for ready mixed concrete producers, including truck-mounted electro-mechanical devices and sensors. RS technologies measure concrete slump during delivery to job sites; they especially enable producers to monitor authorized or unauthorized addition of water—or other changes to the ready mixed as dispatched—that can compromise product quality or spur rejected loads.

Read More