The aim of this study is to evaluate the effect of the different types of fly ash on the compressive strength properties of sintered briquettes. While there are many types of fly ash available, some are not suitable for use in concrete. Fly ash or pulverized fuel ash (PFA) is the residue from the combustion of pulverized coal collected by mechanical or electrostatic separators from the flue gases or power plants. When mixed with lime (calcium hydroxide), pozzolans combine to form cementitious compounds. Lost your password? The colour of the fly ash depends upon the chemical and mineral constituents. Fly ash G is an alkaline fly ash with a high content of CaO, whereas fly ash K has a high sulphate content and is a highly alkaline fly ash without pozzolanic properties. Calcium hydroxide in hydrated Portland cement does not do anything for strength, so therefore we use it up with reactive silica. Class F fly ash has pozzolanic properties only. A dark grey to black colour is typically attributed to an elevated un-burned content. There are no specific requirements for the types of fly ash that may be used in flowable fill mixtures. Commonly produced flyash by burning anthracite or bituminous coal usually has less than 5% lime. In other word, the burning of harder, older anthracite and bituminous coal typically produces Class F fly ash. When flyash is treated with silicon hydroxide, it acts as a catalyst. Ash aggregate may also be used as conventional aggregates for use in asphalt, concrete, and road construction. VIP members get additional benefits. Fly ash bricks are manufactured by mixing water, quarry dust/river sand, cement, fly ash and stone aggregates less than 6mm, normally the actual cement volume will be replaced with 10% to 20% fly ash. Fly Ash – Properties, Types, Mechanism and Uses, 1. The chemical composition of fly ash depends upon the type of coal used and the methods used for combustion of coal. In other word, the burning of harder, older anthracite and bituminous coal typically produces Class F fly ash. Types of fly ash . Class F Type Fly ash normally produced by burning anthracite or bituminous coal, usually has less than 5% CaO. This grade of Fly ash is derived from bituminous coal having fractions SiO2+Al2O3+Fe2O3 greater than 70 %. This aggregate may also be blended with other lightweight aggregates to achieve greater quantities. Typically used for embankment construction. The major uses of fly ash are listed below, Read More: Fly Ash Bricks and Comparison with Clay Bricks – Composition, Manufacture. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. According to different ways of discharge, fly ash can be divided into dry-discharged and wet-discharged fly ash. Bottom Ash is formed in the firing chambers of boilers at electric utility power plants in the U.S. and around the world. Fly ash particles are spherical particles ranging from 1-150 m m in diameter. 3. Type of Fly Ash as per American Society for Testing and Materials (ASTM C618), 3. Fly ash is also used as a component in the production of flowable fill. Fly Ash, a very fine, powdery material composed mostly of silica made from the burning of finely ground coal in a boiler. There are two common types of fly ash: Class F and Class C. Class F fly ash contain particles covered in a kind of melted glass. Please enter your email address. Fly ash particles are mostly spherical and smooth on the surface, with a particle size mostly less than 45μm, and can be directly used in ready-mixed mortar without grinding. ASTM C618 is the standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. It defines the specifications and class limits. While there are many types of fly ash available, some are not suitable for use in concrete. Fly ash quality measures have been established based on major element chemistry . TYPES OF FLY ASH I) Class F II) Class C 8. The classification of fly ash is done differently as per codes used. Type F fly ash is produced from the combustion of bituminous or an anthracite coal contains CaO below 10 percent and possesses pozzolanic properties. Lime content in the fly ash gives tan and light colours where as brownish colour is imparted by the presence of iron content. • Ductility improves with decreasing fly ash content for all the mixes of PC concrete. There are different types of fly ash, including Class F and Class C, generated by burning black coal and brown coal respectively. Heavier ash particles (bottom ash or slag) fall to the bottom of the burning chamber and the lighter ash particles (Fly Ash) fly out with the exhaust gas, thus the term Fly Ash. All Rights Reserved. Fly Ash. There are two types of fly ash, Class C and Class F. Class C has self-cementing properties and is used in the production of concrete as a substitute for Portland Cement, and as a chemical stabilizing & modifying agent to dry and/or strengthen poor soils. When mixed with lime (calcium hydroxide), pozzolans combine to form cementitious compounds. TYPES OF FLY ASH I) Class F II) Class C 8. Recent studies have shown that the network ratio of fly ash glass is a rigorous indicator of fly ash performance in concrete. The specific gravity of fly ash ranges from a low value of 1.90 for a sub-bituminous ash to a high value of 2.96 for an iron-rich bituminous ash. Fly ash is used as component in geoploymers. Depending on the type of coal and the resultant chemical analysis, ASTM has classified flyash into . Fly ash quality measures have been established based on major element chemistry . 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