greening of slag cement

concrete greening - Slag Cement

Hardened concrete containing slag cement may show mottled green or bluegreen areas on the surface in the first few days after placement. This temporary condition is commonly called "greening." What Causes Greening? The blue-green color is attributed to a complex reaction of sulfide sulphur in slag cement with other compounds in portland cement.

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Greening of Slag Cement Concrete Concrete Construction ...

Aug 31, 2011  Hardened concrete containing slag cement can show mottled green or blue-green areas on the surface in the first few days after placement. This temporary condition commonly is called “greening.”. Surface greening occurs in only a small percentage of concrete made with slag cement and does not affect concrete

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Greening effect of slag cement-based concrete ...

May 01, 2021  Greening effect is not associated with hazardous leachates or ecotoxic effects. • Alkaline pH (> 11) is the main issue with cement or slag-based materials.

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Greening effect in slag cement materials - ScienceDirect

Nov 01, 2017  The mortar was made from a slag-cement, with a Blaine specific surface about 12 000 cm 2 /g, containing 82% of GGBS and siliceous sand (58.5 vol %) with a water/binder ratio of 1,5. The concrete was made from a CEM III/A 52,5 L CE PM-ES-CP1 NF cement, with a Blaine specific surface of 4175 cm 2 /g, which contained 64% of GGBS. The water/binder ...

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Greening effect of slag cement-based concrete ...

Greening effect is not associated with hazardous leachates or ecotoxic effects. • Alkaline pH (> 11) is the main issue with cement or slag-based materials. • The algae R. subcapitata is not affected by high pH unlike the crustacean D. magna. • GBFS contain sulfides up to 1 wt.% release in eluates of concretes and pastes. •

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Greening Of Slag Cement Explained - Concept Concrete WA

May 28, 2019  Slag cement is usually found in soil cement, masonry, precast concrete, ready-mix concrete, and high-temperature resistant building materials. What Is Greening? Solidified concrete that is containing slag cement sometimes have the appearance of blue-green or mottled green areas on the surface during the first few days after placement of the ...

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Greening effect in slag cement materials Request PDF

The "greening effect" refers to hardened concrete containing Granulated Blast-Furnace Slag (GBFS) that displays a vivid blue-green color after removal of formwork. This temporary coloration effect ...

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Greening effect in slag cement materials - ScienceDirect

Greening effect in slag cement materials. ... mix Portland cement/GGBS (30/70), concrete and mortar). ... This “greening effect” demonstrates a progressive oxidation of sulfide-based compounds initially contained in these materials during curing of GGBS bearing materials. Previous article in issue;

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Greening effect of concrete containing granulated blast ...

Oct 01, 2020  Four industrial containing slag cements were used to formulate the concretes and cement pastes. As our primary focus was studying the greening effect and environmental implications of using cementitious materials containing various amounts of GBFS, only commercially available CEM III cements were used composed mainly of clinker and GBFS.

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Slag Cement Production

Hardened concrete containing slag cement may show mottled green or blue-green areas a few days after placement, symptoms of a temporary condition known as "greening." SCIC #10, Greening, explains why the phenomenon happens, and explains that greening has no effect on the strength, durability and low permeability of slag cement concrete.

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DECRYPTAGE N°5 Greening of cement-based concretes ...

Greening of cement-based concretes containing blast furnace slag 1/5 Greening: a temporary colouring due to polysulfide ions, having no impact on concrete usage properties INTRODUCTION Since the late 19th century, blast furnace slag has been used in the manufacture of cements - mainly

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Why "Greening" Occurs Concrete Construction Magazine

Dec 01, 2003  A.Jan Prusinski, P.E., executive director of the Slag Cement Association, explains why "greening" occurs and what to expect: The color you describe is caused by complex reactions between sulfide sulfur compounds in the slag cement and portland cement compounds.

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Greening effect of concrete containing granulated blast ...

1 Greening effect of concrete containing granulated blast-furnace slag composite cement: is there an environmental impact? Julien Couvidat a,1, Cécile Diliberto a*, Eric Meux b, Laurent Izoret c, André Lecomte a a Université de Lorraine, CNRS, IJL, F-54000 Nancy, France b Université de Lorraine, CNRS, IJL, F-57000 Metz, France c ATILH, Paris-La-Défense Cedex, France

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Slag Cement Questions

Often, slag cement concrete that is many years old will manifest greening when the concrete is broken up (in the non-surface interior portions of the concrete). Greening

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Greening effect of concrete containing granulated blast ...

The "greening effect" refers to hardened concrete containing Granulated Blast-Furnace Slag (GBFS) that displays a vivid blue-green color after removal of formwork. This temporary coloration effect, which fades within a few days to weeks, has raised concerns about its potential impact on the environment. Three types of leaching tests were conducted to assess different potential release ...

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Greening the concrete jungle—how to make environmentally ...

Aug 22, 2017  Greening the concrete jungle—how to make environmentally friendly cement. ... This contains cement made from other products rather than limestone, such as fly ash, slag or clay.

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slag in concrete Topic

Jul 01, 2021  The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials. Various types of slag are produced: - Blast-furnace slag—The nonmetallic product, consisting essentially of silicates and aluminosilicates of calcium and of other bases, that is developed in a molten condition simultaneously with iron in a blast

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The Greening of Civil Infrastructure ASTM ...

The project is taking advantage of the unique properties of fly ash and ground granulated blast furnace slag to enhance the durability and strength of the concrete used. Caltrans started the new span in 2002 to replace the old, seismically vulnerable span that was damaged in a

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Discolored Concrete: 3 Causes and What You Can Do

These materials include slag, which is a combination of many recycled materials mixed together to form a concrete-like mix. However, using cement replacements next to an existing pour is usually not a good idea. In the case of slag, a greenish or bluish tint can appear on your concrete after about a year, and it won’t look as pretty as it sounds.

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Slag Cement Information Sheet Index

The Slag Cement Association has published 28 information sheets in the Slag cement in Concrete series. These are listed below in numeric order. Click on the icon to the left of the title of any of the sheets for a free download. Also, the sheets are arranged and summarized by topic on the " About Slag Cement " choice in the navigation bar. Number.

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Carbonation Characteristics of Alkali-Activated Blast ...

Aug 07, 2014  Alkali-activated ground granulated blast-slag (AAS) is the most obvious alternative material for ordinary Portland cement (OPC). However, to use it as a structural material requires the assessment and verification of its durability. The most important factor for a durability evaluation is the degree of carbonation resistance, and AAS is known to show lower performance than OPC.

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What is Green Concrete? Its Applications and Advantages in ...

This was first invented in Denmark in the year 1998 by Dr.WG. Concrete wastes like slag, power plant wastes, recycled concrete, mining and quarrying wastes, waste glass, incinerator residue, red mud, burnt clay, sawdust, combustor ash and foundry sand. The goal of the Centre for Green Concrete is to reduce the environmental impact of concrete ...

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Tony Fiorato Concrete Construction Magazine

Aug 31, 2011  Greening of Slag Cement Concrete ... Concrete Construction: Resources for contractors and specifiers including construction methods, materials and practices. Concrete Construction Relevant Sites: Architect; Builder; Zonda Home; About;

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Greencrete: A project on environmentally friendly concrete

May 13, 2021  Students are tested in their knowledge of “green” concrete through a course project that requires the development of Greencrete. Greencrete is similar to a commercially available product called Quikcrete 5000©. Quikcrete 5000© is a ready-mix bag of concrete available in 80 pound bags that will attain a compressive strength of 5000 psi by 28 days of age. Each bag consists of cement ...

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Greening Concrete - PATHnet

Slag, a byproduct of steel production, is another cement substitute that lowers concrete's CO2 footprint. Slag is more lightweight than cement, which increases its strength-to-weight ratio. It is often easier to find than fly ash. Cement substitutes are widely available from most concrete

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Greening effect of concrete containing granulated blast ...

1 Greening effect of concrete containing granulated blast-furnace slag composite cement: is there an environmental impact? Julien Couvidat a,1, Cécile Diliberto a*, Eric Meux b, Laurent Izoret c, André Lecomte a a Université de Lorraine, CNRS, IJL, F-54000 Nancy, France b Université de Lorraine, CNRS, IJL, F-57000 Metz, France c ATILH, Paris-La-Défense Cedex, France

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The Greening of the Concrete Industry: Factors ...

Concrete production not only depletes the environment of 12.6 billion tons of natural aggregates and consumes 1 trillion tons of municipal water every year (Mehta, 2002), but also produces about 1.8 billion tons of Portland cement annually

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Greening of the Concrete Industry for Sustainable ...

Greening of the Concrete Industry for Sustainable Development. The concrete industry is energy intensive and produces a large volume of carbon dioxide emissions. To reduce the environmental impact of the industry we must practice industrial ecology by recycling the waste products of one industry by substituting them for the raw materials of ...

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Is Green Cement the Future of Sustainable Construction ...

Jan 15, 2019  Green cement making reduces cement intake, and its major raw materials include discarded industrial wastes like blast furnace slag and fly ash. Hybrid green cements are specialized forms of green cement characterized by attractive parameters like high long-term strengths and

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(PDF) On the origin of the blue/green color of blast ...

The "greening effect" refers to hardened concrete containing Granulated Blast-Furnace Slag (GBFS) that displays a vivid blue-green color after removal of formwork.

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Greening the concrete jungle: how to make environmentally ...

Aug 21, 2017  Greening the concrete jungle: how to make environmentally friendly cement August 21, 2017 3.21pm EDT • Updated August 23, 2017 4.00am EDT Rackel San Nicolas , The University of

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What is slag cement

Slag cement is a hydraulic cement formed when granulated blast furnace slag (GGBFS) is ground to suitable fineness and is used to replace a portion of portland cement. It is a recovered industrial by-product of an iron blast furnace. Molten slag diverted from the iron blast furnace is rapidly chilled, producing glassy granules that yield ...

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Slag Cement Information Sheet Index

The Slag Cement Association has published 28 information sheets in the Slag cement in Concrete series. These are listed below in numeric order. Click on the icon to the left of the title of any of the sheets for a free download. Also, the sheets are arranged and summarized by topic on the " About Slag Cement " choice in the navigation bar. Number.

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Blast Furnace Slag Cement - Manufacture, Properties and ...

Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. Ground granulated blast furnace slag cement (GGBFS) is a fine glassy granules which contain cementatious properties.

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Ground Granulated Blast-Furnace Slag SpringerLink

Dec 09, 2017  Slag Cement Association (2002) Greening, Slag Cement Association P.O. Box 2615 Sugar Land, TX 77487–2615 Google Scholar Smolczyk HG (1978) Zum Einfluß der Chemie des Hüttensandes auf die Festigkeiten von Hochofenzementen.

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How to Make Cement From Blast-Furnace Slag

Apr 23, 2017  The most important method of regulation used with the low-percentage Al2O3 slag cements in the U.S.A. is the Whiting process. This process includes the use of caustic soda, caustic potash, sodium chloride, c., added either as aqueous solution or in a dry state at some stage of the process of cement manufacture.

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LEHIGH SLAG CEMENT PRODUCT DATA SHEET

LEHIGH SLAG CEMENT PRODUCT DESCRIPTION Lehigh Slag Cement conforms to ASTM C989/AASHTO M 302 standard specifications for “Slag Cement as a Constituent in Concrete and Mortars” and CSA A3001 “Cementitious Material for Use in Concrete.” Slag has cementitious properties similar to portland cement.

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01 Cement 090313 - Concrete Pipe

Mar 13, 2009  temporary greening of the hardened concrete may occur . 2/12/2015 20 39 Pozzolans • ASTM C618 Standard Definition “pozzolan, n. a siliceous or siliceous and aluminous material which in itself possesses little or no ... when batching with fly ash and slag cement

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