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is slag better than fly ash

is slag better than fly ash

  • The Difference in Slag Cement and Fly Ash - Slag Cement News

    Once a good relationship with a supplier is established, slag cement can be used at a higher percentage than fly ash. In most cases, slag cement can be used as a 30-50% replacement to portland cement, reducing the carbon impact of the concrete. To check for suppliers in

  • Fly ash and slag - ScienceDirect

    01/10/2019  The degree of granulated blast-furnace slag utilization in the composition of cement and concrete is over 90%, whereas the fly ash is about 30% [ 2 ].

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  • Evaluation of the Effect of Fly Ash and Slag on the ...

    AbstractIntroductionMaterials and Test MethodsResults and DiscussionConclusionsData AvailabilityConflicts of InterestAcknowledgmentsThe application of cement asphalt mortar (CAM) in modern high-speed railways has been gaining attention due to its combined merits between asphalt and cement hydration product characteristics. To promote sustainable development, it is promising to utilize by-products in the making of new CAM instead of using only cement. In this research, the cement content was partly replaced by fly ash or ground-granulated blast furnace (GGBS) slag to achieve this objective. Then, laboratory experiments were con
  • Which cement is better, fly ash-based or slag cement? - Quora

    Flyash cement increases the workability of concrete as that of slag based, and slag based concrete increases the compressive strength of concrete as compared to

  • What is fly ash and slag?What is the difference between slag and cement?What is the difference between opc cement and portland ...What is the difference between PPC cement and Slag cement ...See more results
  • Fly Ash Bricks vs Clay Bricks – Which is Better?

    Fly Ash Bricks vs Clay Bricks. From the comparison, anyone can clearly predict that Fly Ash Bricks has more advantages than clay bricks for new house construction. 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 ...

  • Slag or Flyash – What’s the difference? – BGC Cement

    28/09/2017  Higher addition rates of either slag or flyash usually increase initial setting times and reduce very early strength development when compared with straight cement mixes. However, strengths at 28 days and beyond are usually better when appropriate amounts of slag or flyash are added and the concrete is properly cured.

  • FLY ASH CONCRETE - WHAT ARE THE REASONS FOR ADDING FLY

    Fly ash chemically reacts with this lime to create more CSH, the same "glue" produced by the hydration of cement and water. By producing more CSH the paste becomes stronger over time and also closes off more of the capillaries that allow the movement of moisture through the concrete.

  • What Is Fly Ash Concrete and How Is It Made?Before coal is consumed in a power plant, it is first ground into a fine powder. This coal powder is blown into the power plant's boiler, the carbo...Why Should You Consider Fly Ash Concrete?The paste is the key to strong and durable concrete, assuming average quality aggregates are used. At full hydration, concrete made with regular ce...Fly Ash in Concrete Enhances WorkabilityThe "ball bearing" effect of fly ash creates a lubricating effect when concrete is in its plastic state.The benefits of fly ash in concrete: 1. Wor...Fly Ash in Concrete Increases PerformanceThe benefits are: 1. Higher strength, fly ash continues to combine with free lime increasing compressive strength over time. 2. Increased durabilit...Fly Ash Concrete Is Better For The EnvironmentMore 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...
  • Fly ash or GGBS? - International Cement Review

    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.

  • The Effect of Fly Ash on the Sulfate Resistance of Concrete

    intrusion than concrete without fly ash. This study investigated eighteen fly ashes and five different portland ce­ ments. The fly ash was used as a volumetric replacement for portland cement in the quantities of 25, 35 and 45 percent. Curing time, air content, and slump were also varied to investigate their effect on the sulfate resistance of concrete containing fly ash. Each of the fly ...

  • Uses, Benefits, and Drawbacks of Fly Ash in Construction

    UsesClassificationPropertiesBenefitsDurabilityFly ash can be used as prime material in many cement-based products, such as poured concrete, concrete block, and brick. One of the most common uses of fly ash is in Portland cement concrete pavement or PCC pavement. Road construction projects using PCC can use a great deal of concrete, and substituting fly ash provides significant economic benefits. Fly ash has also been used as embankment and mine fill, and it haSee more on thebalancesmb
  • FLY ASH CONCRETE - WHAT ARE THE REASONS FOR ADDING FLY ASH

    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 resources. It also reduces the energy intensive manufacturing of portland cement. This reduction in energy leads to less emissions of greenhouse gases. The use of a ton of fly ash

  • The Effect of Fly Ash on the Sulfate Resistance of Concrete

    intrusion than concrete without fly ash. This study investigated eighteen fly ashes and five different portland ce­ ments. The fly ash was used as a volumetric replacement for portland cement in the quantities of 25, 35 and 45 percent. Curing time, air content, and slump were also varied to investigate their effect on the sulfate resistance of concrete containing fly ash. Each of the fly ...

  • A Closer Look: Fly Ash, Slag Cement Metakaolin ...

    07/01/2020  Slag cement is generally ground to less than 45 microns and has a specific gravity in the range of 2.85 to 2.95. Slag is generally used in higher percentages than fly ash, commonly constituting between 30% and 45% of the cementitious material in concrete, while some comprise as high as 70% or more of the cementitious material in a mix.

  • 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 Furnaces. 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 the possibility of cracks. This

  • 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 particles.

  • The feasibility of properly raising temperature for ...

    The feasibility of properly raising temperature for preparing high-volume fly ash or slag steam-cured concrete: An evaluation on DEF, 4-year strength and durability Highlights•DEF in HFC-80 is significantly delayed compared with that in PC-90 while DEF does not occur in HSC-80.•The expansion of HFC-80 at 4 years is significantly larger than that of PC-60 while the expansion

  • Uses, Benefits, and Drawbacks of Fly Ash in Construction

    17/02/2019  Currently, more than 50 percent of the concrete placed in the U.S. contains fly ash. Dosage rates vary depending on the type of fly ash and its reactivity level. Typically, Class F fly ash is used at dosages of 15 to 25 percent by mass of cementitious material, while Class C fly ash is used at dosages of 15 to 40 percent.

  • Using Fly Ash in Concrete - Precast Concrete

    08/05/2010  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

  • Fly Ash, Slag, Silica Fume, and Natural Pozzolans, Chapter 3

    Fly Ash, Slag, Silica Fume, and Natural Pozzolans Fly ash, ground granulated blast-furnace slag, silica fume, and natural pozzolans, such as calcined shale, calcined clay or metakaolin, are materials that, when used in conjunc-tion with portland or blended cement, contribute to the properties of the hardened concrete through hydraulic or pozzolanic activity or both (Fig. 3-1).

  • Sulfate Attack - Slag Cement

    The use of slag cement is also an extremely effective way of reducing the potential for sulfate attack 1. How does Slag Cement Mitigate Sulfate Attack? The use of slag cement reduces the likelihood of sulfate attack in three ways: Slag cement does not contain C 3 A, so its addition in concrete dilutes the total amount of C 3 A in the system. Slag cement reduces concrete

  • Using Fly Ash in Concrete - Precast Concrete

    08/05/2010  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. The carbon content was reported in some to be so high that it was beyond the

  • 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 particles.

  • 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.

  • The feasibility of properly raising temperature for ...

    The feasibility of properly raising temperature for preparing high-volume fly ash or slag steam-cured concrete: An evaluation on DEF, 4-year strength and durability Highlights•DEF in HFC-80 is significantly delayed compared with that in PC-90 while DEF does not occur in HSC-80.•The expansion of HFC-80 at 4 years is significantly larger than that of PC-60 while the expansion

  • Kinetics of Alkaline Activation of Slag and Fly ash-Slag ...

    or slag, to form a final product with properties comparable to or better than those of ordinary Portland cement. The kinetics of alkali activation is highly dependent on the chemical composition of the binder material and the activator concentration. The influence of binder composition (slag, fly ash or both), different levels of alkalinity, expressed using the ratios of Na 2O-to-binders (n ...

  • 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 No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161 19. Security Classif. (of this report) Unclassified 20. Security Classif. (of

  • Coal Ash, Fly Ash, Bottom Ash, and Boiler Slag NRDC

    09/01/2015  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 coal ash—so light that they “fly ...

  • 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 potential for using fly ash as a supplementary cementitious material in concrete has been known almost since the start of the last century (Anon 1914), although it wasn't until the mid-1900s that significant utilization of fly ash

  • 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 pastes. It can significantly reduce the number of harmful pores (>20 nm) and increase the number of harmless pores (<20 nm), which refines the pore structure and makes the structure denser. In this study, the ground fly ash is made of ordinary grade I fly ash by grinding. Compared with grade I fly ash ...

  • Concrete: Cement Substitutes - GGBS, PFA and more

    Pulverised Fuel Ash (PFA), aka ‘Fly ash’ as a cement substitute. PFA is a by-product of coal-burning power stations. As part of the combustion process, coal is pulverised into a powder before being burned. About 18% of the fuel forms fine Limestone spheres, about 75% of which rise with the flue gases from the combustion. The ‘ash’ is recovered from the gases and used, amongst

  • Coal Ash, Fly Ash, Bottom Ash, and Boiler Slag NRDC

    09/01/2015  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 coal ash—so light that they “fly ...

  • Kinetics of Alkaline Activation of Slag and Fly ash-Slag ...

    Most research is focused only with alkali-activation of fly ash or slag, however little information is reported on the combined use of both. The combination of fly ash and slag results in altering the chemical composition of the starting materials in order to develop beneficial properties that

  • 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 pastes. It can significantly reduce the number of harmful pores (>20 nm) and increase the number of harmless pores (<20 nm), which refines the pore structure and makes the structure denser. In this study, the ground fly ash is made of ordinary grade I fly ash by grinding. Compared with grade I fly ash ...

  • Experimental Study on Glass Fibre Reinforced Steel Slag ...

    3. Steel slag can achieve good strength when compared to normal concrete. 4. Replacement in different percentages of fly ash to concrete judge an optimum percentage of better strength result than plain concrete. 5. Research on steel slag, Limestone fibre and fly ash can minimize the

  • Investigation on Mechanical and Durability Properties of ...

    Properties of Fly Ash and Slag based Concrete Dr. B. Vidivelli#1, S ... than 65% fly ash produced by coal power stations is disposed of in landfills and ash ponds. In India alone, fly Ashland fill covers an area of 40,000 areas (160 2). The recycling of fly ash has become an increasing concern in recent years. Ground Granulated Blast Furnace Slag is made up the largest portion of by -products ...

  • Differences Between Portland Cement Concrete and Fly Ash ...

    Fly ash absorbs moisture more easily than Portland cement. If the concrete contains a high amount of fly ash, the water used to create it will be absorbed more readily and the concrete mixture will become thicker and more resistant to movement. This is a negative attribute if the concrete needs to be carefully molded or sculpted into specific patterns. Strength The same qualities that cause ...

  • 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.

  • What is slag cement.any advantages or disadvantages over ...

    17/04/2017  I had practically used PPC cement in almost all projects. I didn't find any problem. Portland Slag Cement (PSC) Portland Slag Cement (PSC) is manufactured by either inter-grinding in the Portland cement clinker, Gypsum Granulated Slag or blendin...

  • The European Research Project GEOASH: The development of ...

    When compared with the heat-cured conventional method of alkali- activation, room temperature hardened slag / fly ash-based geopolymer cements have better properties: higher strength, safer long-term durability and lower leachates.

  • Materials Free Full-Text Comparative Study on Chloride ...

    A comparative study on binding capacity of chloride in cement-fly ash system (C-FA) and cement-ground granulated blast furnace slag system (C-GGBS) with diethanol-isopropanolamine (DEIPA) was investigated in this study. Chloride ions was introduced by adding NaCl in paste, and the chloride binding capacity of the paste samples at 7 d and 60 d was examined. The hydration process was discussed ...