• Which cement is better, fly ash-based or slag cement? -

    12/02/2018  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...

  • The Difference in Slag Cement and Fly Ash

    The performance of fly ash in concrete is strongly influenced by its chemical composition. Fly ash from different sources can behave very differently.” -Design and Control of Concrete, PCA (r.1) “The process of manufacturing iron in a blast furnace and producing slag is a relatively consistent process world-wide. The chemistry of the resultant slag granules and slag cement from granules is ...

  • Slag cement with fly ash - Slag Cement Association

    The ternary diagram, shown in Figure 1 shows that slag cement is more closely related to portland cement than fly ash. This is one reason why slag cement can be used in much larger amounts. Both are used as a replacement for a portion of the portland cement. Slag cement replaces as much as 50 percent in normal concrete (and up to 80 percent in special applications such as mass concrete). Fly ...

  • Why use Fly Ash and Slag in Concrete? - Bay-Lynx ...

    Although set times are prolonged with fly ash, in just 28 days, the strength of the concrete will surpass the same mix without the fly ash. Slag is similar to fly ash in that it is finer than standard Portland cement and is also cheaper as it is a process byproduct. It is is produced by the steel production industry. Slag happens when iron ore ...

  • Fly ash and slag - ScienceDirect

    The wide use of fly ash in the cement and concrete composition is primarily determined by the high fineness close to fineness of cement, the chemical and phase composition as well as its pozzolanic activity (typical for siliceous ashes). When industrial fly ash contains from 10% to 30% by mass of reactive CaO and a part of this ash is pozzolanic, then, they are referred to as so-called ...

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

    With regard to the replacement of cement by slag or fly ash, this solid content was added into the initial premixed stage as cement. 2.2. Mixing Stability Test. Based on preliminary research suggestion, the CAM mixture should obtain proper mixing stability to achieve good flowability and homogeneous particle distribution without agglomeration phenomenon. Therefore, the mixing stability test is ...

  • Author: Tri H. M. Le, Dae-Wook Park, Jin-Yong Park, Tam M. Phan
  • Which Cement is Best for House Construction? OPC vs PPC ...

    PPC is Portland Pozzolana Cement ,a part of Oridinary Portland cement is replaced by fly ash ,the % replacement can range from 15% to 35% PSC is Portland Slag Cement ,a part of Oridinary Portland cement is replaced by Ground granulated blast furnace slag (GGBFS),the % replacement can range from 25% to 70%.

  • Differences between fly ash, slag and silica fume - Low ...

    The use of fly ash in concrete can contribute to LEED points through local materials, recycled contents and innovation credits. Fly ash can compensate for fine materials that may be lacking in sand quantities and can be very beneficial in improving the flowability and finishability of concrete mixtures. The two designations for fly ash used in concrete are Class C and F and are described in ...

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

    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. While flyash is typically used at replacement rates up to 30%, GGBFS is ...

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

    17/07/2017  The aggregates are typically different types of stone, but the base is most often Portland cement, a mixture of clays, metallic elements and minerals like calcium and silica. While Portland cement can have fly ash in it, fly ash concrete is typically made with a base of full fly ash instead of any Portland cement.

  • EFFECT OF ADDITION OF FLYASH AND GGBS ON CEMENT

    “Strength and durability test of fly ash and GGBS based geo polymer concrete” [21] IS 10262: 2009 (Specifications for concrete mix design). [22] IS 456: 2000 (Plain and reinforced concrete ...

  • FLY ASH CONCRETE - WHAT ARE THE REASONS FOR

    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 to

  • (PDF) Use of Fly Ash and Slag in Concrete: A Best Practice ...

    Fly ash: the long-term drying shrinkage and creep of fly ash concrete will be similar to, or lower than that of portland cement concr ete of similar 28-day compressive strength.

  • Differences Between Portland Cement Concrete and Fly

    17/07/2017  The aggregates are typically different types of stone, but the base is most often Portland cement, a mixture of clays, metallic elements and minerals like calcium and silica. While Portland cement can have fly ash in it, fly ash concrete is typically made with a base of full fly ash instead of any Portland cement.

  • Degradation process of alkali-activated slag/fly ash and ...

    The experimental results revealed that alkali-activated slag/fly ash-based pastes are more resistant to phosphoric acid attacks compared to ordinary Portland cement-based peers. Furthermore, it is also observed that the kinetics of degradation of the pastes are vastly different, depending on their binders: the degradation process of ordinary Portland cement-based pastes can be described by ...

  • WHY USE FLY ASH AND SLAG IN CONCRETE? - Bay-Lynx ...

    Although set times are prolonged with fly ash, in just 28 days, the strength of the concrete will surpass the same mix without the fly ash. Slag is similar to fly ash in that it is finer than standard Portland cement and is also cheaper as it is a process byproduct. Slag is produced by the steel production industry. Slag happens when iron ore ...

  • Which cement is better, slag based or fly ash based ...

    18/06/2019  Fly ash actually replaces some of the cement because it has some of the same chemical properties. Due to its particle size and chemistry, it is sometimes specified for acid-resistant concrete and for road mixtures. Slag is a relatively non-reactive, mineral-like solid and acts more like aggregate in the concrete mix and does not give any additional strength. So, fly ash is better!

  • 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

  • Frontiers The Effect of Blast Furnace Slag/Fly Ash Ratio ...

    The aim of this study was to determine the effects of partial fly ash substitution in to a series of alkali-activated concrete based on a high-MgO blast furnace slag BFS. Mixes were activated with various amounts of sodium silicate at alkali modulus (mass ratio SiO2/Na2O) values of 1.0, 0.5, and 0.25. The results showed that, an increase in the fly ash content extended the initial setting time ...

  • Strength and Durability of Concretes with Slag-Fly Ash ...

    lower in concrete mixtures with theAP-based superplasticizer than in the corresponding mixture with the SN-based admixture. On ... Mortars Made with Portland Cement–Blast Furnace Slag-Fly Ash Blends”, Cement and Concrete Research, V. 21, pp. 523-534, 1991. 5. Nagataki, S., “Mineral Admixtures in Concrete: State of the Art and Trends”, ACI SP-144, pp. 473-484, 1994. 6. Dehuai, W., and ...

  • Frontiers The Effect of Blast Furnace Slag/Fly Ash Ratio ...

    The aim of this study was to determine the effects of partial fly ash substitution in to a series of alkali-activated concrete based on a high-MgO blast furnace slag BFS. Mixes were activated with various amounts of sodium silicate at alkali modulus (mass ratio SiO2/Na2O) values of 1.0, 0.5, and 0.25. The results showed that, an increase in the fly ash content extended the initial setting time ...

  • Strength and Durability of Concretes with Slag-Fly Ash ...

    lower in concrete mixtures with theAP-based superplasticizer than in the corresponding mixture with the SN-based admixture. On ... Mortars Made with Portland Cement–Blast Furnace Slag-Fly Ash Blends”, Cement and Concrete Research, V. 21, pp. 523-534, 1991. 5. Nagataki, S., “Mineral Admixtures in Concrete: State of the Art and Trends”, ACI SP-144, pp. 473-484, 1994. 6. Dehuai, W., and ...

  • A short look at low carbon cement and concrete - Cement ...

    Looking at cement first, the easiest way for many producers to bring a lower carbon product to market has been to promote cements made using secondary cementitious materials () such as granulated blast furnace slag or fly ash. These types of cements have a long history, typically in specialist applications and/or in relation to ease of supply. For example, cement producers in eastern India ...

  • Slag Cement Vs Fly Ash - NCR Repair Center

    Slag cement Ground Granulated Blast Furnace Slag and fly ash Coal Combustion Product are the most commonly used supplementary cementitious materials in construction today While they are commonly used and similar in many ways these materials produce different effects on concrete performance and this document will explore those differences . High and New Technology Industrial Development Zone ...

  • Optimal Design of the Cement, Fly Ash, and Slag Mixture

    1. Introduction. Fly ash and slag are industrial byproducts and are widely used as mineral admixtures in the concrete industry. Fly ash and slag have many advantages, such as reducing CO 2 emissions, lowering material costs, and improving workability and late–age strength. However, the addition of fly ash and slag to concrete reduces its carbonation resistance.

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  • Fly Ash or GGBFS (Slag) – BGC Cement

    Fly ash and ground granulated blastfurnace slag (GGBFS) are used as cement constituents world wide. The use of these products when blended with Portland cement is helpful in improving the durability of concrete mixes. Fly Ash is a by-product of the remains of molten shale which is used in coal-fired power stations. Slag is by-product from the blast furnaces used to make iron. The properties of ...

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

    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, 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). A pozzolan is a ...

  • E-Crete Geopolymer Concrete, Fly Ash Concrete Zeobond

    Consisting of fly ash, the by-product of burning coal at a power station, and slag, the by-product of steel manufacturing, E-Crete™ reduces the embedded CO2 of concrete by at least 60% compared to Ordinary Portland Cement (OPC) based concrete. This provides two significant environmental benefits: the first is CO2 abatement, which is unparalleled in the construction industry, and the second ...

  • Journal of Sustainable Cement-Based Materials

    Mechanical property and structure of alkali-activated fly ash and slag blends ... Journal of Sustainable Cement-Based Materials. Volume 1, 2012 - Issue 4. Published online: 17 Dec 2012. Article. Fly Ash-Based Geopolymer Concrete. D Hardjito et al. Australian Journal of Structural Engineering. Volume 6, 2005 - Issue 1. Published online: 22 Sep 2015. Article. Effect of process parameters on the ...

  • CO2 optimized cement based on synthetic slag made of fly ash

    optimized cement based on synthetic slag made of fly ash Anja Buchwald1 and Johannes A.L.M. Wiercx2 1 ASCEM B.V., The Nederlands, e-mail: [email protected] 2 ASCEM B.V., The Nederlands, e-mail: [email protected] Abstract Alkali-activated materials harden under the reaction of an alkaline source and a raw material reactive in such way. Different raw materials are suitable for the

  • The Disadvantages of Fly Ash in Concrete Hunker

    17/07/2017  Fly ash is a byproduct from coal-fired power plants that is frequently used as an admixture in concrete to replace a portion of the Portland cement. Using fly ash in concrete is environmentally beneficial because it reduces the Portland cement (a major contributor of CO2) required in concrete.

  • AN EXPERIMENTAL STUDY ON SLAG/FLY ASH-BASED

    setting time of the studied slag/fly ash-based geopolymer cement could be extended to about 20 minutes for the two mixes with slag/fly ash ratios of 50/50 and 75/25. Although the setting time was not significantly increased, it was considered acceptable for this study because it provided sufficient time for conducting the fresh concrete tests and producing samples. Therefore, it was suggested ...

  • Comparison between Portland Pozzolana Cement Processed ...

    at 7, 14, 28 and 90days and the results were compared with ordinary Portland cement concrete (without fly ash). All the studies confirmed that up to a critical level of 20–30%replacement; activated fly ash cement improved both the corrosion-resistance and strength of concrete. Chemical activation of fly ash yielded better results than the other methods of activation investigated in this ...

  • Class C and Class F Fly Ash: Comparisons, Applications ...

    Class C vs. Class F Fly Ash for Concrete Pavement Report 0092-12-04 Sponsored by the Wisconsin Highway Research Program Co-Principal Investigators Daniel M. Vruno, PE American Engineering Testing, Inc. Gerald C. Anzalone Research Engineer Michigan Tech Jianping Dong, Ph.D. Professor Michigan Tech. Objectives • Evaluate several locally available Class F fly ash sources in comparison

  • Geopolymer cement - Wikipedia

    Later on, in 1997, building on the works conducted on slag-based geopolymeric cements, on the one hand and on the synthesis of zeolites from fly ashes on the other hand, Silverstrim et al. and van Jaarsveld and van Deventer developed geopolymeric fly ash-based cements. Silverstrim et al. US Patent 5,601,643 was titled 'Fly ash cementitious material and method of making a product'.

  • Manufacturer of Fly-Ash Based Portland Pozzolana

    This imparts a greater degree of fineness to ACC Fly-ash based PPC cement, improved workability properties while mixing, and makes concrete more corrosion resistant and impermeable. All of this makes for better long-term strength and improved corrosion resistance and therefore, greater life for your constructions. ACC Fly-ash based PPC is an eco-friendly cement

  • Formulation of Geopolymer Cement using Class F Fly Ash for ...

    Alumina and Silica such as fly ash, slag and rice husk as binders for the formulation of geopolymer cement. This study focuses on the low calcium fly-ash based geopolymer cement lass F) which is a byproduct from the combustion of coal in coal power plants. The current annual fly ash production is estimated to be 500 million tonnes and only 16 % of the total fly ash produced are currently being ...

  • Development of Fly Ash- and Slag-Based Geopolymer

    12/12/2018  ASCE Subject Headings: Polymer, Compressive strength, Fly ash, Slag, Synthetic materials, Concrete, Binders (material), Calcium carbonate Journal of Materials in Civil Engineering Vol. 30, Issue 12 (December 2018)

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

    When used in concrete mixes, fly ash improves the strength and segregation of the concrete and makes it easier to pump. Applications for Fly Ash . Fly 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