coal fly ash used in cement yahoo answers

Why is limestone used for making glass - Answers It is used in making Portland cement to make concrete It is used in making steel and glass, toothpaste, plastics, paint, tiles and even bread and cereals Limestone is used as a food additive for .
The Future of Fly Ash Use in Concrete - NPCA Nov 22, 2013· Failures of fly ash settling ponds, like the 2008 TVA spill, are extremely rare events, and in any case, only dry fly ash is used in concrete – not wet material in settling ponds And lastly, the EPA has not indicated any desire to restrict fly ash use in concrete
Mix Design - Page 2 Fly ash or pulverished fuel ash (pfa) is a finely divided powder thrown out as a waste material at the thermal power plants using pulverized coal for raising steam in the boilers In the building industry, the use of fly ash a part replacement of cement in mortar and concrete at the construction site has been made all over the world including .
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Alternative Binders for Concrete Other Than Cement Hi t f C t Bi dHistory of Concrete Binders ~ 3000 BC midxe with s traw to nbi d d ried The Egyptians began to use mud i d ith t t bi d d i d t t bricks They also used d fli gypsum mor ars and mor ars of lii me in tthe h building of the pyramids The Chinese used cementitious materials in ,
Does the UK need more nuclear power stations? | Yahoo Answers Jun 18, 2008· The nuclear industry has a different view on this from organisations opposed to nuclear power So, since we undoubtedly need to renew some of our existing power stations, you need to compare nuclear with non-nuclear for your stats to have any relevance
what is the chemical difference between coking coal and , Aug 31, 2009· Coal is a combustible black rock consisting mainly of carbonized plant matter and used as a fuel coke is a solid fuel made by heating coal in the absence of air so that the volatile components are driven off Carbon residue left after the incomplete combustion or distillation of fuels
why is the extraction of limestone so , - BINQ Mining Pakistan Trade, Pakistan Trade Food & Drink, India Pakistan , Because of so many layers and lack of , With a host of sub-sectors it is the largest industry in Pakistan and it , Livestock has emerged as an important sub-sector of agriculture »More detailed
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Advantages and Disadvantages of Coal Burning Power , - Yahoo Jan 28, 2013· No matter how "clean" the burning of coal can be made, it still has to be mined and that is inherently a very dirty process, producing large amounts of acid runoff, spoil piles, and in some cases, the complete removal of mountain tops Coal, when it is burned, produces NO2 and SO2 (producers of acid rain), fly ash, and other particulat
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When was concrete first used? | Yahoo Answers Aug 29, 2007· Portland cement was first used in concrete in the early 1840s In modern times the use of recycled materials as concrete ingredients is gaining popularity because of increasingly stringent environmental legislation The most conspicuous of these is fly ash, a byproduct of coal fired power plants This has a significant impact by reducing the .
What causes cement to harden? | Yahoo Answers Sep 02, 2014· Okay, so my question is, what is the explanation for cement hardening during the hydration process? Can you be precise with an explanation of the chemical reaction? And also, I've read up about cement replacement techniques where some forms of ash (example fly ash, rice husk ash, saw dust ash) are used because they display pozzolanic properti
coal slag or copper slag THERMAL EXPANSION OF SLAG AND FLY ASH FROM COAL GASIFICATION IN IGCC POWER PLANT M Ainetoa, A Acostaa, JMa Rincónb, M Romerob a , THE INFLUENCE OF THE SILICATE SLAG COMPOSITION , the influence of the silicate slag composition on copper losses during smelting of the sulfide concentrates Ž
Can flyash replace cement in concrete? - Quora Aug 01, 2016· Composition of Cement: Portland cement consists essentially of compounds of lime (calcium oxide, CaO) mixed with silica (silicon dioxide, SiO2) and alumina (aluminum oxide, Al2O3) Composition of Flyash: Depending upon the source and makeup of the.
concrete is made up of four basic ingredients ? | Yahoo , Mar 24, 2009· Concrete is a construction material composed of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel, limestone, or granite, plus a fine ,
How Do They Make Smokeless Coal,? | Yahoo Answers Apr 11, 2008· Coalite or Phurnacite are examples of manufactured smokeless fuels Although different processes are used to produce a smokeless 'coal' the majority of these are based on reducing the volatile content (the gaseous component of the coal that creates the smoke), pulverising, curing and binding the coal/anthracite into a briquette
what is non-coking steam coal? | Yahoo Answers Aug 14, 2011· caking index is the factor governing the coking capacity of coal,\it is a number , best coke can be obtained from coal which also named as prime coking coal(17-22 caking index bearing coal )produced as hard coke that is high carbon content upto 75-80% carbon used for steel industry non -coking coal
how to calculate the water cement ratio for concrete mix , Aug 25, 2010· Placement difficulties can be resolved by using plasticizer The water-cement ratio is independent of the total cement content (and the total water content) of a concrete mix Often, the water to cement ratio is characterized as the water to cement plus pozzolan ratio, w/(c+p) The pozzolan is typically a fly ash, or blast furnace slag
Acid Resistance - cementorg The main reason for the increased acid resistance of the concrete investigated was the formation of a very dense hardened cement paste and aggregate interface with very low porositi The use of slag cement increased acid resistance as well as portland cements with silica fume (up to 8 percent by mass of cementitious material) or fly ash
How many nuclear power plants are there in North , - Yahoo Mar 26, 2011· huge carbon footprint from coal mining, storing of coal, and disposal of fly ash from coal burning plants is a major concern if the rules used to control pollution from nuc plants was applied to coal; we wouldn,t be allowed to use coal at all fast breeder reactors would virtually eliminate uranium mining i,m betting on nuclear power for the 21st century nothing else even comes close for .
concrete underground storage tank crack and leak , - Yahoo Jul 01, 2008· concrete underground storage tank crack and leak prevention? I am building my own underground storage tank (UST) out of concrete and have heard that the tank can crack, creating leaks and loosing water , and fly ash to strengthen the concrete Order the fly ash mixed in the concrete, and a vinyl admix if they have it , Join Yahoo Answers .
Coal Ash Reuse | Coal Ash (Coal Combustion Residuals, or , FLY ASH CONCRETE IS BETTER FOR THE ENVIRONMENT More than 12 million tons of coal fly ash are used in concrete products each year The use of fly ash, a recovered resource, reduces the depletion of natural resourc It also reduces the energy intensive manufacturing of portland cement
what are the usage of fly ash? | Yahoo Answers Sep 13, 2006· This collected ash either is sold for use in the cement/construction industry or disposed of in ash ponds or landfills Recently, more fly ash is used beneficially, though more than 65% of fly ash produced from coal power stations still is disposed of
How Coal Hurts Our Environment | Beyond Coal The Beyond Coal Campaign is part of Sierra Club’s efforts to not only protect every person's right to the outdoors, but also to promote affordable clean energy that safeguards the health of our communities, protects wildlife, and preserves our remaining wild plac
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Are there any ethical issues related to , - Yahoo Answers Nov 11, 2009· Are there any ethical issues related to recycling of certain products? If there is, where can I find more information? , Coal Ash (aka Fly Ash, Bed Ash, Bottom Ash) is sometimes used for road base, or mixed in cement , Join Yahoo Answers and get 100 points today Join Trending Questions Trending Questions
Cement Standards and Concrete Standards Cement Standards and Concrete Standards ASTM's cement and concrete standards are instrumental in the evaluation and testing of concrete, cement, and aggregat Concrete can have different properties depending upon the mixture that is used in creating it, which contains cement, chemical admixtures, and aggregat
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coal fly ash % used in cement? | Yahoo Answers Nov 17, 2007· Portland Flyash Cement contains up to 30% fly ash The flyash is pozzolanic, so that ultimate strength is maintained Because flyash addition allows a lower concrete water content, early strength can also be maintained Where good quality cheap flyash is available, this can be an economic alternative to ordinary Portland cement