Production of cement and concrete admixtures: Fly ash is used to replace clay as a raw material for cement production. When reacting with water, fly ash will react with calcium hydroxide released from the chemical reaction between cement and water, forming a binding product, contributing to improving the quality of concrete. Of the 67.3% fly ash used to make cement in 2011, 1.6% was used to produce aggregate cement or concrete admixture.
As road embankment leveling material: Fly ash is usually lighter than sand, impermeable, absorbs air and holds high water. Bottom ash is used as a road embankment because it is very light and is used as a base material. For fly ash, to increase strength and bearing capacity, it is necessary to add chemical bonding agents such as lime and cement. This mixture can be used as a material for leveling, embankment, roadbed, ground improvement and mud pit filling.
As architectural materials: Ash from coal-fired power plants has high thermal insulation, good sound insulation and does not burn. Taking advantage of these properties, bottom fly ash is used as a partition and soundproofing material.
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