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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-cured concrete exhibits the ...
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.
Nov 19, 2014· 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.
cause discoloration. Factors found to influence discoloration are: the use of calcium chloride, variation in cement alkali content, delayed hydration of the cement paste, admixtures, hard-troweled surfaces, inadequate or inappropriate HOW to Avoid Discoloration? 1. Calcium chloride in concrete can cause concrete discoloration.
2. 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. 3. The type, kind, and condition of formwork can in-fluence surface color. Forms with different rates of absorption will cause surfaces with different ...
Oct 12, 2016· Plaster Discolorations – New white pool plaster can discolor (darken or turn gray) from adding excessive calcium chloride set accelerator, from late hard troweling, from thin and thick areas due to an uneven shell, etc. Gray (or grey) mottled discoloration (also known as "water entrapment" or "hydration") is smooth to the touch and difficult to lighten, may be remedied by acid ...
Mar 14, 2013· Usually white in color, efflorescence is a discoloration caused by crystalline deposits of salts on concrete surfaces. These deposits often contain compounds such as calcium, sodium and potassium hydroxides or carbonates, bicarbonates, chlorides, and sulfates of calcium and magnesium.
Common Causes of Discolored Concrete. Preventing Concrete Discoloration. Fixing Discolored Concrete. Discoloration is a tricky subject, since many factors can contribute to the problem (see photo). However, discoloration, whether occurring in a single placement or sequential concrete placements, generally boils down to one root cause ...
Tip #1: Avoid the use of Calcium Chloride. This can be disastrous for your concrete surfaces and the primary cause for concrete discolouration; Tip #2: Make sure you have high quality moulds as the absorption rate can cause discolouration in the concrete. It .
Gray Mottling Discoloration #2 - Pool Genius Network. causes gray (or grey) mottling discolorations in...Since calcium chloride is known to cause a ...When are we as concrete pool guys going to ... » Learn More. Cadman | Ready-Mix. Calcium chloride is the most commonly used accelerator, although non-chloride... Calcium chloride in concrete is ...
May 28, 2010· Adding calcium chlorideA 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 ...
CIP 23 - Discoloration - Roanoke Concrete ProdCIP 23 - Discoloration, Calcium chloride in concrete is a primary cause of concrete discoloration The chances for dis-coloration are much less if calcium chloride or chlo-ride-bearing chemical admixtures are not used 3 The type, kind, and condition of formwork can in-Calcium Chloride in Portland ...
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 reaction of tetracalcium aluminoferrites in the cement.
Concrete discoloration is not a rare event. Laying concrete isn't an exact science, and there are a variety of factors that can contribute to concrete discoloration from the very beginning. These factors include: Variability in concrete mixtures; The use of too much or not enough water; The use of calcium chloride; Improper concrete laying ...
This can cause inconsistencies in the color of your cement project. 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.
HOW to Avoid Discoloration: 1. Calcium chloride in concrete can cause concrete discoloration. Flake or pelletized calcium chloride, when not mixed uniformly, discolors more than liquid calcium chloride. 2. The type, kind, and condition of formwork can influence surface color.
Jun 04, 2014· Gray (also spelled "grey") or darkened blotchy or streaky discoloration of pool plaster (cement flatwork) is known to be caused by several improper plastering practices, including the addition of calcium chloride to the mix (even less than 2%), late hard or dry troweling, and sometimes a cement material issue can lead to this problem.
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.
Sep 28, 2014· Paula, adding calcium chloride to ready-mix concrete can cause all sorts of issues. It's an additive that's used to speed up the hydration chemical reaction in the concrete so the concrete transform from a plastic material to a solid faster in colder weather.
Discoloration: Some of the most common causes of concrete discoloration include using calcium chloride to speed set times, changes in the mix proportions or material sources, uneven curing. Curling: When curling occurs, essentially what happens is that there is a distortion of the flat surface into a curved shape. This is frequently the result ...
Calcium chloride reduces the electrical resistance of the concrete and promotes the electrochemical process. Calcium chloride also increases shrinkage cracks in concrete . Hence use of calcium chloride as an accelerator in concrete results in steel corrosion, and it should be avoided for the excellent performance of the structure.
Concrete Slab Surface Defects: Causes, Prevention, Repair, IS 177.04T, PCA, 2001, Certain treatments have been found to be successful in removing or decreasing the surface discoloration of concrete flatwork Discoloration caused by calcium chloride admixtures and some finishing and curing methods can be reduced by repeated ...
Greyish or cloudy spots – Moisture can lift the sealer from the concrete, which causes light to diffuse underneath the sealer (also called "sealer diffusion"), resulting in the appearance of discoloration. Color whitens or "blushes" – Too much moisture on the surface prevented the sealer from bonding, so it floats on the water instead.
A common yet unforeseen problem with polished concrete floors is splotchy color variances in the finished product. Factors that bring on this discoloration could be a result of multiple phases of the concrete floor creation: pouring, troweling, and curing the concrete. For this reason, to determine the cause of the discoloration of the concrete floor,.Read More+
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