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27Al and 29Si Solid

Calcium silicate hydrate (C-S-H) is the main constituent of hydrated cement paste and determines its cohesive properties Because of the environmental impact of cement industry it is more and more common to replace a part of the clinker in cement by secondary cementitious materials (SCMs) These SCMs are generally alumina-rich and as a consequence some aluminum is incorporated into the C-S-H Get price

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Fly Ash

consists of at least 30% fly ash slag or other cement substitute and/or 50% recycled content or reclaimed aggregate by volume or 90% recycled content or reclaimed aggregate based on the IS0 14021 definition LEED v4 recognizes fly ash as pre-consumer recycled product (IN) Option 1-3 Innovation 1 to 5 points TheseGet price

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Slag

Slag from steel mills in ferrous smelting on the other hand is designed to minimize iron loss and so mainly contains oxides of calcium silicon magnesium and aluminium Any sandy component or quartz component of the original ore automatically carries through the smelting process as silicon dioxide Get price

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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 reducesGet price

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Which cement is better fly ash

Feb 12 2018FlyAsh 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 isGet price

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Fly Ash Slag Silica Fume and Natural Pozzolans Chapter 3

Fly ash ground granulated blast-furnace slag calcined clay metakaolin calcined shale and silica fume contribute to the strength gain of concrete However the strength of concrete containing these materials can be higher or lower than the strength of concrete using portland cement as the only cementing material Get price

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Effect of the Composite of Fly Ash and Slag on Alkali

The study used the method of accelerated mortar bar test to study alkali aggregate reaction (ASR) with sandstone aggregate Both fly ash and slag can inhibit the expansion of mortar bar 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 Get price

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Concrete With Fly Ash Vs Concrete Without?

Jul 28 2010The reason I am asking is we have for quite some time used ready mix suppliers who use the fly ash (at around 15% ratio I think ) But we have recently (last couple of months) been using a ready mix supplier who does not use fly ash straight cement only or so we are told The non-fly ash supplier's concrete definitely gets harder faster Get price

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Study of Foamed Concrete from Activated Ash/Slag Blended

An ecotype of foamed concrete was prepared from activated fly ash/slag blended cement a kind of low carbon cement through physical foaming and hydrothermal curing process The optimized material proportion and curing conditions were obtained with the aid of orthogonal array technique activated fly ash/slag blended cement-600 kg and foaming agent-1kg for per cubic meter formed concrete Get price

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slag

Slags especially waste from slag processing and unprocessed waste slag are classifiable in the Green List if suitable for admissible recovery operations (e g recovery in the construction industry or use as sand-blasting products) and if they in no way constitute hazardous waste (e g because of contamination especially in the case of many Get price

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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 Get price

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Use of Fly Ash or Slag in Concrete Proposed PWGSC

sulphate attack 3 4) The use of fly ash and GGBF slag in concrete will reduce the amount of heat generated in the concrete mass that in turn will reduce thermal gradients and thermal stresses in concrete 5) The resistance to freezing and thawing of concrete Get price

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Benefits of slag and fly ash

The use of ground granulated blast furnace slag and powder coal fly ash as an addition to either cement or concrete is well-established Concrete made with these secondary raw materials as a part of the binder does show distinctive advantages over concrete with Portland cement only Get price

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Effect of Electric Arc Vitrification of Bottom Ash on the

Increasing amounts of municipal solid waste incineration (MSWI) residues are treated prior to landfilling or reuse In Japan electric arc melting is used for bottom ash vitrification that generates a glasslike slag The objective of this paper was to assess this pretreatment technique with respect to its effect on metal mobility and metal content Get price

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What is Slag Cement

What is Slag Cement Slag cement is a hydraulic cement while fly ash is a pozzolan This information sheet lists the properties slag cement can bring to concrete in both plastic and hardened form For example the addition of slag cement usually results in reduced need for water faster time of set improved pumpability and finishability Get price

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Fly Ash Slag Cement Storage Load Out

Fly Ash Slag Cement Storage Load Out Date 01 28 2019 Tank Connection's bolted RTP (Rolled Tapered Panel) silos feature reliable product flow and remarkable coating toughness Bolted RTP designs provide the freedom of diverse configuration and accessory options The bolted RTP drive through silos shown are no exception Get price

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Open Access proceedings Journal of Physics Conference series

industrial wastes such as fly ash and blast furnace slag as main raw materials [4] The resulting CO 2 is 80% less than Portland cement In view of its environmental pleasant aspect low prices excellent performance and other advantages of geopolymer grouting material it is more in line with the greenGet price

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Preparation of fly ash

Fu Chenghong Ni Wen Zhang Xufang et al 2011 Slag-fly ash based cementitious materials special for high performance concrete[J] Journal of University of Science and Technology Beijing 33 606-613 in Chinese Zhao F Q Ni W Wang H J et al 2007 Activated fly ash/slag blended cement[J] Resources Conservation Recycling 52 303-313 Get price

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Effects of Municipal Solid Waste Incinerator Fly Ash Slag

A low fly ash slag replacement ratio reduces compressive strength for up to 28 days The cement pastes with slag with a low w/b ratio and low fly ash slag replacement ratio had a high compressive strength The positive effect of incorporating slag into blended pastes is that the volume of fine pores increases as curing duration increases Get price

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Dynamic Behaviors of Fly Ash–Ground‐Granulated Blast

Dynamic Behaviors of Fly Ash–Ground‐Granulated Blast‐Furnace Slag–High‐Magnesium Nickel Slag‐Based Geopolymer Paste When Subjected to Impact Compressive Loadings Zhijun Dong Department of Civil Engineering Shenzhen Institute of Information Technology Shenzhen Longxiang Road Shenzhen 518172 P R ChinaGet price

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Properties of concrete incorporating fly ash and ground

This paper presents a laboratory study on the influence of combination of fly ash (FA) and ground granulated blast-furnace slag (GGBS) on the properties of high-strength concrete A contrast study was carried out for the concrete (GGFAC) incorporating FA and GGBS control Portland cement concrete and high-volume FA high-strength concrete (HFAC) Get price

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Compressive Strength and Elastic Modulus of Concretes with

Mar 27 2019Abstract This paper presents the evolution of compressive strength and the modulus of elasticity of concretes with binary and ternary blends of ordinary Portland cement fly ash and ground granulated blast-furnace slag (GGBS or slag) Get price

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Slag

The aim of this study was to use nuclear magnetic resonance (NMR) spectroscopy to study the nanostructure of poorly ordered phases in SFB by varying slag/fly ash ratio curing time and curing temperature Fly ash was completely substituted with metakaolin and the effect of this substitution on the poorly ordered phases was studied Get price

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FLY ASH SLAG

fly ash specified in ASTM C 618 (Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete) (ASTM 1993) set the maximum acceptable expansion in the ASTM C 441 test at 0 02% For slag appendix of 989 (Specification for Ground Granulated Blast-Furnace Slag for Use in Concrete andGet price

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Determination of volatile organic compounds in coal fly

Heptane is the most abundant aliphatic hydrocarbon spe- cially in ash and slag produced by coal B although this compound presents an irregular behaviour having limit of detection values below 3g/g One of the most important differences between fly ash/slag and coal samples is the halogenated hydrocarbon pattern Get price

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Class C and Class F Fly Ash Comparisons Applications

Acknowledgements NCHRP Report 749 Methods for Evaluating Fly Ash for Use in Highway Concrete Larry Sutter 1 Doug Hooton 2 Scott Schlorholtz 3 Zeyad Ahmed 1 Melanie Keuber Watkins Dave Hand 1 Andre de Groot 2 1 Michigan Technological University 2 University of Toronto 3 Get price

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Fly Ash Slag Silica Fume and Natural Pozzolans

Fly Ash Slag Silica Fume and Natural Pozzolans Also known as — Supplementary Cementing Materials (SCMs) — a material that when used in conjunction with portland cement contributes to the properties of the hardened concrete through hydraulic or pozzolanic activity or both Fly Ash Slag Silica Fume and Natural Pozzolans Get price

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CN1085195A

Powdered coal ash and slag used as basic raw materials along with exciting agent composed of solium sulfate lime gypsum high-Al powder (as waste of soda industry) and magnesium chloride goes through proportioning mixing and grinding to obtain water-hardening cementing material Its advantages include no need of high-temp calcine reducing environmental pollution low cost and high Get price

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The Difference in Slag Cement and Fly Ash

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 pGet price

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Concrete Time Of Set

Fly ash and pozzolan properties How Does Slag Cement Affect Time of Set? At temperatures less than 85 degrees Fahrenheit concrete containing slag cement can have longer times of set when compared with 100 percent portland cement concrete The lower the ambient and/or concrete temperatures the slower the set times will be (Figure 1) Get price

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feature Specifying Fly Ash for Use in Concrete

Limitations on the class of fly ash or supplementary cementitious material Some specifi cations only permit the use of C618 Class F fl y ash In many parts of the country good quality Class C fl y ash is also available In some regions a good quality Class N pozzolan such as calcined clay is also used Get price

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