calcium chloride concrete slab discoloration
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Calcium Chloride Concrete Slab 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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Discoloration — What, why, how? – Nevada Ready Mix

Calcium chloride in concrete is a primary cause of concrete discoloration. The chances for discoloration are much less if calcium chloride or chloride-bearing chemical admixtures are not used. The type, kind, and condition of formwork can influence surface color.

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Causes for Slab Discoloration Concrete Construction Magazine

Oct 01, 1996  This study showed that discoloration could be produced by using calcium chloride in the concrete, applying a hard-trowel finish, and failing to moist cure for the first day after concrete placement. Discoloration was caused primarily by calcium chloride retarding the

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CIP 23 Discoloration - NRMCA Expanding the Concrete ...

Apr 23, 2020  Factors found to cause discoloration include: the use of flake form of calcium chloride that may not completely dissolve, variation in cement 1. Calcium chloride in concrete can cause dis-coloration. Flake or pelletized calcium chlo-ride, when not mixed uniformly, discolors more than liquid calcium chloride. 2. The type, kind, and condition of ...

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Discolored Concrete: 3 Causes and What You Can Do

Secondly, the usage of calcium chloride in an attempt to speed up the setting process of the concrete can lead to discoloration. Calcium chloride can significantly increase the chances of your cement project turning dark. Lastly, there’s the issue of poor workmanship. This can occur in any of the following forms:

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Concrete Discoloration: Drying Different Colors or Spotty ...

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. Inadequate mixing after addition of calcium chloride makes the concrete color even more irregular or

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Flatwork Discoloration: Cause and Remedies Concrete ...

Jun 03, 2013  The use of calcium chloride as a chemical accelerator can exacerbate the problem by increasing the magnitude and permanence of the surface discolorations. Since a winter flatwork mix was used and considering the severity of the discolorations, most likely your concrete contained calcium chloride.

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Dark Discoloration of Flatwork Concrete Construction Magazine

Aug 01, 1984  Methods that may help prevent dark discoloration are: avoiding the use of calcium chloride in the mix; avoiding hard troweling late in the hardening process; and curing the concrete promptly and thoroughly. If the slab does become discolored, it may be possible to reduce the discoloration by flushing with hot water and drying, perhaps more than ...

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Why Does Concrete Turn Black? What Causes Discoloration?

Jan 29, 2021  A concrete slab with severe discoloration. Prevention. The key to dealing with concrete black spots or discoloration is prevention. Once they occur, all you can really do is try to clean them with an acid wash. Here are some great tips to follow. Don’t Use Calcium Chloride.

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CIP 23 - Discoloration

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. Factors found to influence discoloration are: the

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Surface Discoloration of Concrete Flatwork

Laboratorystudies of mottling discoloration of hori-zontal concrete slabs ara dascrlbed, showing that discoloration is increased by hard troweling, by usa of celcium chloride admixtures, or by poor curing of fhe dabs. Local discoloration can also be caused by non-uniform curing conditions. Avoiding the

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Why Is New Concrete Discolored? - Cement Answers

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. These are some of the commonly asked questions about colored concrete.

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Discolored Concrete Flatwork - ConcreteSouth

The buildup of condensate water around the ripple and in low spots causes the variation in curing and therefore variations in color. This is especially true in concrete containing calcium chloride. Air cured concrete (which is to say lack of curing) exhibits the greatest amount of discoloration. Thoroughly moist

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Concrete Discoloration: The Complete Guide

The main culprit when it comes to light and dark spots spread across your new slab is calcium chloride. Calcium Chloride is a salt compound that is used in the stabilization of a road, ice, and dust. When pouring concrete, it is used to accelerate the drying process of a slab,

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What is surface discoloration? - Cement Answers

How to prevent discoloration of concrete? Minimizing or eliminating the use of high-alkali content cements will reduce the occurrence of discoloration. Calcium chloride in concrete is a primary cause of concrete discoloration. The chances for discoloration are much less if calcium chloride or chloride-bearing chemical admixtures are not used.

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Why is my Concrete Garage Floor Discolored? Angi [Angie ...

Top-rated concrete pros and industry associations we consulted say that calcium chloride, especially if added in amounts that approach 2 percent of the cement weight, can cause a mottled, blotchy surface. They say the discoloration is probably just an aesthetic issue, not a sign of weakness in the slab.

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CIP 23 - Discoloration

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. Factors found to influence discoloration are: the

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Discolored Concrete Flatwork ... The Causes and How to ...

Dark spots can be removed with a single washdown of water if concrete does not contain calcium chloride. In concrete containing calcium chloride, it is often necessary to wash the area several times. It appears that best results are obtained when such discolored concrete is washed soon after the spots appear.

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Trade Center Identifying Surface Defects on Concrete Slabs ...

The discoloration is caused by bleed water that carries calcium chloride to the surface during the curing process. Large aggregate particles near the surface block the bleed water’s movement to the surface, creating lighter spots on the surface of the concrete. Slide 12: Calcium Chloride Contractors can

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Ask Angie: Some things are not so concrete - News ...

Nov 29, 2014  The finisher used 2 percent calcium for the slab that ended up discolored. The other slab, with 1 percent calcium added, looks fine.— Paula B., Richland, Wash.Dear Paula: A slab can take several ...

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How do you remove brown water stains from concrete ...

Jan 25, 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.

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Concrete Turning Black: Causes, prevention, and how to fix it

It has many similar properties to the cement usually used in concrete, which makes it a fairly effective replacement. Slag concrete tends to have a lighter color than usual, making discoloration all the more noticeable. Calcium Chloride. Calcium chloride is a particular kind

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calcium chloride and concrete - mon-plaisir-gourmand

Calcium Chloride - Hill Brothers Chemical Company. Dry, or anhydrous, calcium chloride is referred to by Hill Brothers' trade name as Hi 94.Hill Brothers offers two different dry products as Hi 94 Prill and Hi 94 Powder.Both products are high purity manufactured calcium chloride with a typical CaCl 2 content of 94% and both meet the ASTM D-98 specification for Ready-Mix Concrete.

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Why is my concrete garage slab discolored? - Lifestyle ...

Jan 10, 2015  The contractor poured two slabs on a day with a high temperature of 53 degrees and a low of 48. The finisher used 2 percent calcium for the slab that ended up discolored. The other slab, with 1 ...

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Concrete Discoloration: The Complete Guide

The main culprit when it comes to light and dark spots spread across your new slab is calcium chloride. Calcium Chloride is a salt compound that is used in the stabilization of a road, ice, and dust. When pouring concrete, it is used to accelerate the drying process of a slab, but if

Get Price

Concrete Mottling Discoloration - ocapa

Calcium Chloride is an established accelerator" that speeds up the hydration of the silicates in cement. However, calcium chloride retards the hydration of the aluminate and ferrite phases in cement. Retarded ferrite phases that remain unhydrated in cement will remain dark. Cement Alkalies moderate the actions of calcium chloride in concrete ...

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Flatwork Discoloration: Causes and Remedies

The use of calcium chloride as a chemical accelerator can exacerbate the problem by increasing the magnitude and permanence of the surface discolorations. Since a winter flatwork mix was used and considering the severity of the discolorations, most likely your concrete contained calcium chloride.

Get Price

Trade Center Identifying Surface Defects on Concrete Slabs ...

The discoloration is caused by bleed water that carries calcium chloride to the surface during the curing process. Large aggregate particles near the surface block the bleed water’s movement to the surface, creating lighter spots on the surface of the concrete. Slide 12: Calcium Chloride Contractors can

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Why Does Concrete Change Color? Causes Solutions

When calcium chloride dosages approach 2% by weight of the cement discoloration can get really bad. Inadequate mixing after the addition of calcium chloride makes the concrete color even more irregular or blotchy. If your time constrained and want to add a little calcium chloride to speed things up, make sure not to add to much and do a very ...

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CIP 23 - Discoloration

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. In most studies, no single factor seemed to cause discoloration. Factors found to influence discoloration are: the

Get Price

How do you remove brown water stains from concrete ...

Jan 25, 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.

Get Price

Why is my concrete garage slab discolored? - Lifestyle ...

Jan 10, 2015  The contractor poured two slabs on a day with a high temperature of 53 degrees and a low of 48. The finisher used 2 percent calcium for the slab that ended up discolored. The other slab, with 1 ...

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Concrete Discoloration

Jan 13, 2014  Anything left on the slab that will slow down the hydration (drying) of the concrete will cause discoloration. This includes, but is not limited to buckets, 2×4’s, drywall, steel, lumber, boxes, and even using too think of a curing blanket with block or buckets on top.

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Common Concrete Problems and Solutions » Engineering Basic

Mar 23, 2018  However, concrete discoloration could occur if any or all of these factors are altered. Concrete discoloration could occur if water is added at the job site, by poor workmanship, different cement material and even if calcium chloride is added to the mix. All concrete ingredients must comply with ASTM standards.

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Moisture Testing of Concrete Slabs Moisture Vapor ...

The anhydrous calcium chloride test, described in ASTM F-1869-10, Standard Test Method for Measuring Moisture Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Chloride. measures the moisture vapor emission rate (MVER) of the slab. The relative humidity probe, described in ASTM F-2170-11,

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Why Does Concrete Discolor? – Concrete FAQ

However, many contractors add too much calcium chloride, leading to dark concrete. If the concrete isn’t mixed correctly, the discoloration is even more pronounced, and there may be blotching. Weather. Weather is another factor that can cause concrete discoloration and curling.

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What Causes Concrete Discoloration? - Ceramics

If the discoloration starts to fade, repeat until it disappears completely.. Why is my concrete spotted? HandyPerson: The black-speckled coloring in concrete is due to a chemical called calcium chloride that is added to concrete to help the concrete cure, in other words, harden.

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Vapor Score - Calcium Chloride Testing

Vapor Score - Calcium Chloride Testing. Your One-Stop Shop for Concrete. Moisture Test Kits. Vapor Score is an industry leader in the production and distribution of concrete moisture test kits through our active and growing participation in all major aspects of the industry. Our

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