is slag better than fly ash

Fly ash and Blast Furnace Slag for Cement Manufacturing

Fly ash and Blast Furnace Slag for Cement Manufacturing GBFS is slag from the iron production in Basic Oxygen Furnac When this slag is actively cooled and ground GBFS is produced which can be utilised as a cement or concrete addition GBFS is said to increase durability of concrete due to an increased setting time which reduces...

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Alternate Cementitious Materials

When compared to portland cement fly ash or ground granulated blast furnace slag silica fume is much finer The addition of small amounts of silica fume 2-5 increase workability while large amounts of silica fume gt 7 decrease workability increase compressive strength decrease permeability and provide resistance to sulfate attack and...

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Which cement is better fly ash

FlyAsh based cement and Slag based cement concrete both have marked a crucial part in concrete industry Flyash based is used for low grade of concrete up to M40 grade where flyash is replaced up to 25 by weight of cement and Slag based cement is...

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Fly Ash Lafarge Canada

Fly ash is an extremely fine powder consisting of spherical particles less than 50 microns in size Fly ash is one of the construction industry s most commonly used pozzolans Pozzolans are siliceous or siliceous/alumina materials possessing the ability to form cementitious compounds when mixed with lime calcium hydroxide or Ca OH 2 and water Fly Ash Concrete Applications...

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Effect of the Composite of Fly Ash and Slag on Alkali

Results show that 50 slag can inhibit ASR reluctantly but 10 fly ash and 20 slag can inhibit ASR very well and the inhibitory effect of fly ash is far better than slag Because of the high content of CaO in slag it has inhibit and promote aspects when the ASR is fierce slag can inhibit ASR otherwise slag can promote ASR...

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Technical Issues Related to the Use of Fly Ash and Slag

fly ash slag scaling resistance maturity low temperature paving freezing and thawing resistance strength development late-fall construction 18 Distribution Statement pavement is most likely to be better than that of the corresponding laboratory specimens This can be attributed to low slump better...

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Fly Ash Slag Silica Fume and Natural Pozzolans Chapter 3

Fly ash slag and calcined clay or calcined shale are used in general purpose construction such as left to right walls for residential buildings pavements high-rise towers and dams 67279 48177 69554 69555 Fig 3-3 Fly ash a powder resembling cement has been...

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Slag cement with fly ash

Fly ash is a byproduct of electric power generation that varies from source to source Concrete Properti Slag cement is a more uniform product than fly ash As a result concrete made with slag cement will generally have more uniform properties than concrete made with fly ash Plastic Properti Water Reduction The use of either material...

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The Influence of Ground Fly Ash on Cement Hydration and

The ground fly ash is better than grade I fly ash to optimize the pore structure of hardened past It can significantly reduce the number of harmful pores x3e 20 x2009 nm and increase the number of harmless pores x3c 20 x2009 nm which refines the pore structure and makes the structure denser...

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Slag Cement Australia

Similar to fly ash blends early age strength development of slag blends is slower than straight cement concrete however strength development from 28 days onwards is equivalent or better In NSW Cement Australia markets GGBFS under the brand Ecocem Safety Data Sheet...

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For Immediate Release

Fly ash bottom ash and synthetic gypsum were all used in construction of new permanent disposal faciliti Use of fly ash and bottom ash in structural fills continued a multi-year decline decreasing 72 percent to 13 million tons Production of boiler slag increased...

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Cement Substitutes

The energy required to grind and ship slag makes it less energy-efficient than fly ash but better than Portland cement Slag concrete is reflective and lighter in color than fly ash and silica fume and it may initially have a blue-green coloring that typically disappears within a week...

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Article Use of class C fly ash for stabilization of soft

slag and bottom ash or geosynthetics-reinforcement data performance of Class C fly ash-stabilized subbase seemed to be equal or better than the other stabilization alternativ Fly Ash Chemistry Fly ash is classified into two classes F and C based on the chemical composition of the fly ash according to ASTM C 618 Class F fly ash is...

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Fly ash or GGBS

Fly ash and ground granulated blastfurnace slag GGBS are regarded as conventional cement constituents in much of the world The proportions used in concrete-making vary quite considerably and the price of the material is key when it comes to producing a cubic metre of concrete to the required specification at the lowest possible cost...

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Different effects of fly ash and slag on anti

Jul 12 2009 0183 32 When the content of fly ash is 10 the corrosion-inhibition action is not obvious when the content is higher than 25 this effect is remarkable Corrosion-inhibition action of slag is better than that of fly ash Slag is not like fly ash that has obvious effect on anode curves Tafer slope so its contribution to restraining rebar in concrete...

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CONCRETE Optimizing the Use of Fly Ash in Concrete

include ground granulated blast furnace slag and fly ashes with high calcium contents such fly ashes display both pozzolanic and hydraulic behavior The quantity of alkalis in fly ash can range from less than 1 Na 2 Oeq 1 up to 10 Na 2 OeqThe average alkali content of the 110...

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Fly Ash Bricks Vs Clay Bricks

Advantages of Fly Ash Bricks over Clay Bricks 1 Fly ash bricks are less costly and lighter in weight 2 Fly Ash bricks consume only 65 kg cement for the construction of 1 m³ of brickwork which is less compare to red brick 3 By using fly ash brick we can reduce cement consumption up to 50 as these brick walls not required plastering on...

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Coal Ash Fly Ash Bottom Ash and Boiler Slag NRDC

Jan 09 2015 0183 32 Boiler slag n melted coal ash The most voluminous and well-known constituent is fly ash which makes up more than half of the coal leftovers Fly ash particles are the lightest kind of...

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Evaluation of the Effect of Fly Ash and Slag on the

A higher fly ash or slag content will protect the mixing stability of asphalt droplets in asphalt emulsion thereby prolonging the demulsification process of the mixture Evidently the CAM particles formed in the fresh mixture with fly ash and slag obtain better homogeneous distribution...

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Kinetics of Alkaline Activation of Slag and Fly ash

Alkali-activated aluminosilicates commonly known as geopolymers are being increasingly studied as a potential replacement for Portland cement These binders use an alkaline activator typically alkali silicates alkali hydroxides or a combination of both along with a silica-and-alumina rich material such as fly ash or slag to form a final product with properties comparable to or better...

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Concrete without Cement

Fly ash concrete does not generate any deleterious alkali-aggregate reaction even in the presence of high alkalinity Fly ash concrete has very low creep and shrinkage Fly ash concrete can withstand heat and cold better than OPC cement concrete Fly ash concrete cost analysis shows that it is economic than OPC cement concrete Disadvantages...

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Kinetics of Alkaline Activation of Slag and Fly ash

These binders use an alkaline activator typically alkali silicates alkali hydroxides or a combination of both along with a silica-and-alumina rich material such as fly ash or slag to form a final product with properties comparable to or better than those of ordinary Portland cement...

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Boiler slag

This ash is potentially usable even after it is put in a storage lagoon Because fly ash and boiler slag have different weights the heavier boiler slag or bottom ash which is disposed of in essentially the same way settles first and the fly ash remains suspended This ponded ash can be reclaimed if the boiler slag is scraped up and dewatered...

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The Durability of Sulfate Resisting Cement Concrete Made

The test results show that SRCC had a better sulfate resistance than OPCC with the same mix proportions and the improvement in sulfate resistance ranged from 5 to 10 Adding fly ash could enhance sulfate resistance of concrete but not as good as adding S95 slag Adding S75 slag adversely affected sulfate resistance of concrete...

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Blended Cement

The most common supplements in blended cements are fly ash silica fume slag cement and limestone Easily the most widely used supplementary material fly ash is a byproduct of coal combustion in electric power plants The fly ash is filtered out of exhaust gases as a fine powder Our Lehigh Cement Company brand for a fly ash blended cement is...

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Application of Fly Ash from Pulp and Paper Industries as

Application of Fly Ash from Pulp and Paper Industries as Slag Formers in Electric Arc Furnace Stainless Steel Production Tova Jarnerud Corresponding Author steel melt in heat E compared with that in heats A and C can be explained by the faster formation of a liquid slag and better slag parameters regarding sulfur refining of steel...

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FLY ASH CONCRETE

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...

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Contributions of fly ash and ground granulated blast

Apr 15 2016 0183 32 The reaction heat per unit mass of GGBS is only 167 higher than that of fly ash The main reason for the difference of hydration heats between GGBS binder and fly ash binder is that GGBS shows much higher hydraulic activity than fly ash...

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Using Fly Ash in Concrete

May 08 2010 0183 32 Both class C fly ash and slag have about 35 percent silica and much lower calcium oxide than portland cement In most cases lower calcium oxide means better durability In some fly ash alumina and iron oxide can be quite high leading to lower strength and unusual setting time problems...

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The Disadvantages of Fly Ash in Concrete Hunker

The structural effects of fly ash may be more critical but cosmetic concerns also affect its use in concrete It is more difficult to control the color of concrete containing fly ash than mixtures with Portland cement only Fly ash also may cause visual inconsistencies in the finished surface such as dark streaks from carbon particl...

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