discoloration of concrete with slag
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discoloration of concrete with slag

Why Does Concrete Turn Black? What Causes Discoloration?

Jan 29, 2021 · Slag concrete tends to have a lighter color than usual, which makes discoloration even more noticeable. All the same issues effect slag concrete just as they do standard mixes. Ingredients, water levels and ratios should all match from batch to batch. Consistency is very important.

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Concrete Discoloration: The Complete Guide

A blueish green discoloration happens when sulfide sulfur within the slag cement reacts with other components of Portland Cement. The bluish-green tint is not any cause for alarm as it will not compromise the strength, or durability of the concrete. As a matter of fact, after about a week the color will begin to disappear.

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CIP 23 - Discoloration

on concrete containing ground slag as a cementitious material. This will disappear with time, generally within a one year period. Concrete containing slag cement does, however, have a generally lighter color. The discoloration of concrete cast in forms or in

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CIP 23 - Discoloration - Fischer Concrete

concrete containing ground slag as a cementitious material. This will disappear with time. Concrete con-taining ground slag does, however, have a generally lighter color. The discoloration of concrete cast in forms or in slabs on grade is usually the result of a change in either the concrete composition or a con-crete construction practice.

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Concrete Discoloration: Drying Different Colors or Spotty ...

Generally, a slag-cement mix will be lighter than a straight-cement concrete. Adding calcium chloride A frequent reason behind a darkened-concrete appearance is the addition of calcium chloride to accelerate the setting time of concrete (see Photo 1), especially when calcium chloride dosages approach 2% by weight of cement.

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CIP 23 - Discoloration

on concrete containing ground slag as a cementitious material. This will disappear with time, generally within a one year period. Concrete containing slag cement does, however, have a generally lighter color. The discoloration of concrete cast in forms or in

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CIP 23 - Discoloration - Fischer Concrete

concrete containing ground slag as a cementitious material. This will disappear with time. Concrete con-taining ground slag does, however, have a generally lighter color. The discoloration of concrete cast in forms or in slabs on grade is usually the result of a change in either the concrete composition or a con-crete construction practice.

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Greenish-Blue Discoloration| Concrete Construction Magazine

The pattern of discoloration is random, with irregular, free-form shapes. The concrete mix on one of the jobs reporting the green discoloration was identified as a slag cement. We have been told that cement people claim the greenish/blue discoloration is a phenomenon and of

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Why Does Concrete Discolor? Reasons & Fixing Discolored ...

Feb 26, 2021 · Inadequate use of admixtures, insufficient mixing time and improper finishing procedures could also lead to discoloration. The concrete containing ground slag may have a yellowish to greenish color as cement material. This will usually disappear in a year. However, concrete that contains slag cement usually has lighter color. Caused by ...

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Concrete Discoloration (Causes And Preventions) - Forever ...

Concrete Discoloration (Causes And Preventions) The discoloration is understood to mean a change in the color of the concrete surface, which z. B. can be caused by the concrete composition, the formwork system, the execution, and/or the environmental conditions. Concrete can have color deviations due to raw materials and processing.

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Concrete Discoloration

Jan 13, 2014 · Adding supplemental cementitious materials in concrete (like fly ash, blast-furnace slag and silica fume) will produce a different color compared to a straight-cement concrete. Concrete Paste Discoloration. When the concrete is polished, tiny layers of the top of the surface are removed.

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Why Does Concrete Change Color? Causes & Solutions

The most common discoloration we tend to see in concrete are streaks or blotches. These can be darker or lighter than the overall concrete color. More extreme color changes in concrete such as blue, green, or yellow are the result of a more environmentally

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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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The coloration phenomenon associated with slag blended ...

In order to decrease the environmental impact of concrete within an environmentally sustainable design and reduce CO 2 emissions due to its production, Ground Granulated Blast-furnace Slag (GGBS ...

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Common Issues of Discoloration in Colored Concrete and How ...

Nov 28, 2017 · While colored concrete can be a great option for your next project, there are a wide variety of factors that can cause issues of discoloration. The key to success when using colored concrete is consistency. Variations in cement color, sand, aggregates, weather, finishing techniques, water cement ratios, site conditions and curing techniques can all affect []

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Why Concrete Turn Colors (and How to Prevent It)

This discoloration can appear in a variety of ways and is caused by multiple factors. Common causes of concrete discoloration are inconsistency in the concrete mixes, water amount, and curing procedure used in different batches of concrete in the same project. Adding calcium chloride to the mixture, using slag cement, or even inaccurate ...

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Concrete slab discoloration : HomeImprovement

The concrete under the shed will cure differently, so will be a different shade. 1. r/HomeImprovement. A community dedicated to helping people with advice on personal home improvement projects. If you are new here, please review posting/commenting guidelines below. 2.3m. Members. 2.4k. Online.

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concrete discoloration - Ask the Builder

Sep 28, 2014 · Without the calcium chloride, the concrete can stay very wet and plastic for hours and hours delaying the finishing process. If the calcium chloride is not mixed thoroughly in the concrete it can lead to discoloration. There are also other complicated chemical reactions that can happen with the Portland cement and other additives (fly ash, slag ...

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Influence of composition and surface discoloration of ...

Jan 15, 2021 · The Cu_slag specimen was composed of copper slag as an aggregate. In the FA specimen, a part of the mixed sand was replaced by fly ash. The water/cement ratio (W/C) was fixed at 55% for all specimen. The specimen had a thin slit as an artificial defect (thickness and width of 4 mm and 50 mm, respectively).

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Discoloration | Morello Concrete Construction, Inc.

Sep 11, 2013 · Concrete containing slag cement does, however, have a generally lighter color. The discoloration of concrete cast in forms or in slabs on grade is usually the result of a change in either the concrete composition or a concrete construction practice. In most studies, no single factor seemed to cause discoloration.

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Blast Furnace Slag - Material Description - User ...

Ground granulated blast furnace slag is used commercially as a supplementary cementitious material in Portland cement concrete (as a mineral admixture or component of blended cement). Disposal It is estimated that a relatively small percentage (less than 10 percent) of the blast furnace slag generated is disposed of in landfills.

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Stains on Concrete types & sources of stains on concrete ...

Stains & colors or discoloration on concrete surfaces: this article provides a catalog of types of stains found on concrete surfaces: walls, floors, ceilings, including un-wanted stains from various causes & deliberate concrete coloring processes, stains, or acid treatments. Methos for removing un-wanted discoloration or stains from concrete.

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slag in concrete Topic

Sep 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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Concrete Slab Surface Defects: Causes, Prevention, Repair

Concrete Slab Surface Defects: Causes, Prevention, Repair Figure 3. Drying-shrinkage cracks like these often result from improper joint spacing. (A5271) 3. Portland Cement Association Figure 4. Crazing is a network of fine surface cracks. (4099) 4.

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UG-Mat Blast Furnace Slag | Recycled Materials Resource Center

The primary issue associated with the use of slag cement is the reported loss of durability (salt scaling resistance) for exposed Portland cement concrete containing more than about 25 percent slag cement. It is unknown if any U.S. agencies are conducting specific research into this concern (some research has been reported in Canada).

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Slag In Concrete - Structural engineering general ...

May 31, 2018 · 31 May 18 19:22. The Concrete Quality Control Lab Coordinator is requesting to include ground, granulated blast furnace slag (slag/ggbfs) in the concrete mix. From past project concrete mix submittals I observe that when slag is used, fly ash is not, and vice-versa. Resources claim that both fly ash and / or slag have similar benefits to ...

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Pigments can be added to any concrete mix. COLOR KIT FOR ...

Colored concrete will continue to lighten until it is fully cured. The optimal recommended dose of pigmen tanges f om 2% (1 bag) o 7% (3 bags) based on the weight of the cementitious materials (e.g., cement, lime, ˛y ash, slag)T.he color saturation point

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Dusting of Concrete Slab Surface - Civil Engineering ...

By KAUSHAL KISHORE Materials Engineer, Roorkee It is supposed that concrete should give satisfactory service to its entire life. However problems arises, if care is not taken during construction blemish appears on the surface of a concrete slab, it will likely to be one of these: bilisters, cracking, crazing, curling, delamination, discoloration. DUSTING, efflorescence, low []

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What causes discoloration in new concrete?

Jan 07, 2020 · Calcium chloride in concrete is a primary cause of concrete discoloration. Concrete surfaces that are troweled too early will increase the water-cement ratio at the surface and lighten the color. Concrete which is not properly or uniformly cured may develop discoloration. ... In most concrete made with slag cement, ...

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How to Fix Discolored Concrete | Home Guides | SF Gate

How to Fix Discolored Concrete. In an ideal world, finishing a concrete slab or a sidewalk section would be a perfect combination of elements every single time, leaving behind nothing but a smooth ...

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How Do You Fix Discolored Concrete? - Concrete Network

Fixing Discolored Concrete Floors Three concrete discoloration fixes for hiding blotches and streaks or changing a floors color. Even when you do everything right, sometimes the color of a concrete floor doesn’t turn out how you expected. Acid stains can be temperamental and cause color variations that weren’t predicted.

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Blast Furnance Slag - User Guideline - Embankment or Fill ...

Slag Compares Favorably with Other Backfill Materials in 5-Years Underground Corrosion Study. National Slag Association, Alexandria, Virginia. Short, A. "The Use of Lightweight Concrete in Reinforced Concrete Construction," The Reinforced Concrete Review. British Reinforced Concrete Association, Vol. 5, No. 3, September 1959.

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