This report gives an overview of the origin and properties of fly ash, its effect on the properties of hydraulic cement concrete, and the proper selection and use of fly ash in the production of hydraulic cement concrete and concrete products. Compressive strength of concrete with fly ash whrp 00924 the hydration of blended. Influence of flyash on strength of concrete containing isf slag a project report submitted in partial fulfilment of the requirement for. Fly ash properties, types, mechanism and uses fly ash is a heterogeneous byproduct material produced in the combustion process of coal used in power stations. Fly ash is commonly used in concrete in replacements ranging from 0 to 30 percent by mass of the total cementitious material. Creep and shrinkage properties in concrete containing fly ash. Seminar report on flyash concrete linkedin slideshare.
Table1 materials mixing proportions fly ash content fly ash sand 4 molding process. Concrete is the largest market for fly ash and offers the highest potential for increased flyash utilization. Some manufacturing plants produce only concrete blocks, while others may produce a wide variety of precast concrete products including blocks, flat paver stones, and decorative landscaping pieces such as lawn edging. Malhotra and others15 report on the use of fly ash in america in 2002. The most commonly used way to produce green concrete is by using the industrial waste products such as fly ash, blast. This report summarizes the experimental observations and conclusions from a research program investigating the properties.
Lastly, we would like to acknowledge that this report would not. At present 1015% of the fly ash produced in australia is. Jan 24, 2016 if the concrete mix is adjusted, it is possible to reach the setting and strength gain required. Explore effect of cement replacement by silica fume and fly ash with free download of seminar report and ppt in pdf and doc format. They estimate that only 30 % of the fly ash produced is used. Cement was replaced with fly ash, fly ash added as 10 to 50% of cement weight which was used in mixing concrete. The content of this report reflects the views of the authors who. Fly ash for use in concrete, jis a 6201 1999 version 16 table 7. Carrasquillo research report number 4816 durability and performance of concrete containing fly ash research project 359481 conducted for texas state department of highways and public transportation in cooperation with the.
This version of concrete is made up from the mix of the industrial waste and inorganic polymer. Fine particles rise with flue gasses and are collected with electrostatic precipitators about 60% power is produced using coal as fuel in india. Ready mix concrete seminar report, ppt, pdf for civil. Fly ash reacts with the hydrating hydraulic cement to form a cementing medium. The most commonly used way to produce green concrete is by using the industrial waste products such. This coal powder is blown into the power plants boiler, the carbon is consumed leaving molten particles rich in silica, alumina. Flyash replacement of cement in concrete ash production and its availability fly ash is one of the residues created during the combustion of coal in coalfired power plants. The setting time for the high volume fly ash concrete at liu centre was in general somewhat longer than for a conventional concrete. Uses, benefits, and drawbacks of fly ash in construction. Also explore the seminar topics paper on effect of cement replacement by silica fume and fly ash with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil. Also explore the seminar topics paper on ready mix concrete with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year. Dosage rates vary depending on the type of fly ash and its reactivity level. Lowcalcium astm class f fly ash is preferred as a source material than highcalcium astm class c fly ash.
Pdf class f fly ash assessment for use in concrete pavements. Bureau of indian standards formulated specifications for clay fly ash bricks, lime fly ash bricks, common burnt clay bricks and calcium silicate bricks which can be referred to as regards to the quality of falg bricks. The production of concrete blocks consists of four basic processes. At present 1015% of the flyash produced in australia is. One of the most common uses of fly ash is in portland cement concrete pavement or pcc pavement.
Because it improves many desirable properties of concrete, it is introduced either as a separately batched material or as a component of blended cement. Effect of cement replacement by silica fume and fly ash. Two thirds is used in the concrete industry, which has reached a maximum consumption figure. We are becoming in a company in where the sustainability within the project is the main reason to develop the project. Fly ash is the finely divided mineral residue resulting from the combustion of coal in electric generating plants. The proposed unite will be using both type of fly ash depends upon the availbality 4. It is a fine grey coloured powder having spherical glassy particles that rise with the flue gases. The project that is the subject of this report was a part of the national cooperative. This conservatism can be understood in the context of concrete where the ash is mixed raw, and the effects. It is a fine residue resembling cement that is a byproduct of burning coal in an electric power generating plant. History of fly ash utilization fly ash concrete was first used in the u. The presence of calcium in high amounts may interfere with the polymerization process and alter the. Fly ash in concrete a literature study of the advantages and. Typically, class f fly ash is used at dosages of 15% to 25% by mass of cementitious material and class c fly ash at 15% to 40%.
Fly ash in concrete pavement concrete construction. Fly ash consists of inorganic, incombustible matter present in the coal that has. Ubco engr 325 project presentation on fly ash in concrete. Fly ash is also used as an ingredient in brick, block, paving, and structural fills. Fly ash has been used in roadways and interstate highways since the early 1950s. Explore ready mix concrete with free download of seminar report and ppt in pdf and doc format. Jul 17, 2017 fly ash is a byproduct from coalfired power plants that is frequently used as an admixture in concrete to replace a portion of the portland cement.
Fly ash concrete is basically the same as regular concrete except some of the cement has been replaced with a material called fly ash. Earlier, the research report gc1 presented the development, the mixture proportions, and the shortterm properties of lowcalcium fly ashbased geopolymer concrete. Fly ash with greater cao content should be evaluated for use per astm c1012 or usbr test 4908. Comparative study on compressive strength of fly ash concrete article pdf available in international journal of civil engineering and technology 84. To ensure the most durable concrete possible, class f fly ash is an essential ingredient when the project will be. Pdf experimental study on use of fly ash in concrete. Fly ash in concrete properties and performance report of technical. The fly ash is then collected in electrostatic precipitators or bag houses and the fineness of the fly ash can be controlled by how and where the particles are collected. Fly ash fly ash is the most widely used pozzolan in concrete. Fly ash reacts with the hydrating hydraulic cement to form a. Before coal is consumed in a power plant, it is first ground into a fine powder.
Green concrete is that type of concrete that is used to create the construction materials having a lesser effect on the environment. This report is devoted to heatcured lowcalcium fly ashbased geopolymer concrete. In this experimental work concrete mix prepared with replacement of fly ash by 0%, 25%, 50%, 75% and 100%. To study the use of fly ash in concrete, cement is replaced partially by fly ash in concrete. Currently, fly ash is used in more than 50% of all ready mixed concrete placed in the. Fragomeni 3 abstract flyash is produced in vast quantities as a byproduct of the burning of fossil fuels for the thermal generation of electricity. In 1974, the federal highway administration encouraged the use of fly ash in concrete pavement with notice n 5080. Creep and shrinkage properties in concrete containing fly ash by mohand l.
Proposed limits of r values at 25 percent replacement 25 table 8. High volume fly ash concrete hydrates more slowly than an ordinary concrete. More recent studies have shown that highvolume fly ash concrete having more than 50% cement replacement with either class c or class f fly ash can be proportioned to meet strength requirements for structural applications naik et al. Presented by dylan kennedy, clayton murray, and eric sandberg. If the concrete mix is adjusted, it is possible to reach the setting and strength gain required. Materials are mixed as mentioned in table 1, as following. This research report describes the longterm properties of lowcalcium fly ashbased geopolymer concrete. A task force was convened at the 2016 meeting of the aashto subcommittee on materials som for the purpose of documenting the issues facing the coal industry and their impact on the production of fly ash, especially as related to use in structural and paving concrete by the dots. One of the important advantages with fly ash concrete is the resistance to alkali aggregate reaction. However, research has shown that using a 50 percent or greater replacement of fly ash can have a wide range of benefits. Fragomeni 3 abstract fly ash is produced in vast quantities as a byproduct of the burning of fossil fuels for the thermal generation of electricity. Concrete is the largest market for fly ash and offers the highest potential for increased fly ash utilization.
Flyash replacement of cement in concrete fly ash concrete. Studies of the properties of paver block using fly ash. The last 50 years has seen the use of fly ash in concrete grow dramatically with close to 15 million tons used in concrete, concrete products and grouts in the u. Majestic project works with organizations to design, fabrications, modelling, analysis and experimental works in various mechanical and core branches. Influence of flyash on strength of concrete containing isf slag a project report submitted in partial fulfilment of the requirement for the award of the degree of bachelor of technology in civil engineering submitted by. Road construction projects using pcc can use a great deal of concrete, and substituting fly ash provides significant economic. This study addresses some of the major con cerns of resident highway engineers on concrete containing fly ash for structural concrete in highway applications. Sample report of fly ash testing which is a reference to use mix optimization. Fly ash is a byproduct from coalfired power plants that is frequently used as an admixture in concrete to replace a portion of the portland cement.
The performance benefits fly ash provides to mechanical and durability properties of concrete have been well researched and documented in actual structures. Fly ash consists of inorganic, incombustible matter. Class c and f fly ashes were used in this research project. Summary of effects of fly ash on concrete properties, 6. I think that in our projects where the use of concrete is very high to finish the civil work, we can substitute a proportion of the cement use for fly ash. Optimizing the use of fly ash in concrete portland cement. Fly ash can be used as prime material in many cementbased products, such as poured concrete, concrete block, and brick. The coarse aggregates consisted of a combination of 10 mm and 16 mm maximum sizes in weight ratio of 1. This method is useful to make strength of fly ash concrete equivalent to the strength of control mix without fly ash concrete at early ages i. Pdf comparative study on compressive strength of fly ash. In this method fly ash is used by replacing part of opc by mass along with adjustment in quantity of fine aggregates and water.
Conservative attitudes are among the factors that limited the use of fly ash in concrete to generally a maximum of 25% replacement of portland cement. Also explore the seminar topics paper on effect of cement replacement by silica fume and fly ash with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil. Uncertainty in the supply of class f fly ash due to impending environmental restrictions has made it imperative to find and test alternate sources of supplementary cementitious materials scms that can provide similar strength and durability benefits to concrete as class f fly ash. Using fly ash in concrete is environmentally beneficial because it reduces the portland cement a major contributor of co2 required in concrete. May 09, 2015 replacement of cement with rice husk ash by 20% 1. For 30% or less, abrasion resistance was comparable to that of the control mix. Influence of fly ash on strength of concrete containing isf slag a project report submitted in partial fulfilment of the requirement for the award of the degree of bachelor of technology in civil engineering submitted by. Ordinary portland cement opc, 43 grade, conforming to is. This research report describes the longterm properties of lowcalcium fly ash based geopolymer concrete.