Sources: ASTM International, West Conshohocken, Pa.; CP staff
ASTM Committee C27 on Precast Concrete Products is set to publish a standard (C1889) for designing drainage and utility infrastructure. The document essentially codifies requirements for precast structures from American Association of State Highway and Transportation Officials load and resistance factor design (LRFD) specifications, and also addresses soil, hydrostatic, surcharge plus other loads.
Sources: American Coal Ash Association, Farmington Hills, Mich.; CP staff
Supply dynamics in key regional markets, primarily linked to coal-fueled power plant closures, spurred an 11 percent year-over-year decline in fly ash consumption in concrete, according to the American Coal Ash Association’s (ACAA) just-released “Production and Use Survey” for 2018. Concrete-grade ash accounted for 12.5 million of the 59.4 million tons of coal combustion products (CCP) beneficially used last year; use of all CCP grades in cement production dropped to 6.4 million tons, off 26 percent from 2017 levels.