Notes/Preview Preview Description Fly ash is used in concrete and other portland cement-based systems primarily because of its pozzolanic and cementitious properties. These properties contribute to strength gain and are known to improve the performance of fresh and hardened concrete, mortar, and grout. The use of fly ash typically results in more economical concrete construction. This report gives an overview of the origin and properties of fly ash , its effect on the properties of hydraulic ... In this article named “ Production of Fly Ash “, the process of fly ash production will be discussed briefly. Fly ash is a by-product of burning coal in an electrical generating station. The following figure shows a typical layout of a coal-burning generating station. Fly ash usually decreases water demand. Most of the other pozzolans increase the water demand. Pozzolans reduce bleeding because of fineness; reduce the maximum rise in temperature when used in large amounts (more than 15% by mass of cementitious material) because of the slower rate of chemical reactions; which reduce the rise in temperature. Coal fly ash From all supplementary cementitious materials (SCMs), fly ash is in fact the most widely used replacement material in concrete. Fly ash is a byproduct of the combustion process of pulverized coal in plants generating electrical power. While combustion, the coal’s mineral impurities fuse in suspension and then are removed away from the combustion chamber by the exhaust gases. In the operation, the fused material cools and solidifies into glassy particles called fly ash . The fly ...
