Better Roads Digital Magazine
Issue link: https://read.dmtmag.com/i/85916
byproduct, fly ash is the residuum of the combustion of coal for electricity generation; its An industrial finer than those of cement and are glassy-spherical in shape minute particles are Also glassy-spherical, silica fume or microsilica is another industrial byproduct, and consists of very fine vitreous particles which are so small they interact at the nanoscale. Here silica fume is magnified 5000x Credit: PMET Inc. physically and chemically to improve the durability and quality of portland cement concrete, boost or retard set time, Mineral and chemical admixtures work frost and sulfate attack, and improve placement increase resistance to Ground granulated blast furnace (GGBF) slag is formed when molten iron blast furnace slag is quenched in water, forming a granular product with very limited crystal formation Credit: PCA development and shorten the set time of concrete, valuable for placing concrete patches, bridge decks or urban Accelerators increase early strength intersections under traffic; they include inorganic and organic chemicals Water-reducing admixtures are used to improve the quality of concrete and to obtain specified strength at lower cement content, and a low-slump. Mid-range water reducers increase strengths. But high-range water reducers or superplasticizers increase slump, resulting in a more pourable, pumpable concrete concrete mix to be stabilized and entrained; they should be specified when concrete will be exposed to freeze/thaw cycles, deicing salt additives which enable bubbles in a Air entraining admixtures are organic applications or sulfate attack Credit: PCA Better Roads May 2012 11