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CIP 23 - Discoloration

may take the form of dark blotches or mottled discol-oration on flatwork surface, gross color changes in large areas of concrete caused by a change in the con-crete mix, or light patches of discoloration caused by ... Steve Kosmatka, Discoloration of Concrete, Causes …

Mottled Skin (Livedo Reticularis) Symptoms, Causes ...

The mottled skin treatment focuses on the underlying cause of the condition, as most times, it will disappear if the health cause is treated or cured. For cases not associated with a health condition, it can be treated and possibly prevented by keeping the skin covered in extreme cold temperatures and in sunlight.

CIP 23 - Discoloration - Roanoke Concrete Prod

that cause surface variation of the water-cement ra-tio, and changes in the concrete mix. 1,2,3,7 HOW to Prevent Discoloration? 1. Minimizing or eliminating the use of high-alkali con-tent cements will reduce the occurrence of discol-oration. 2. Calcium chloride in concrete is a primary cause of concrete discoloration. The chances for dis-

Problem Clinic: Why Does Concrete Discolor?| Concrete ...

What these chemicals do is dissolve the lighter calcium carbonate deposits that occur from carbonation of soluble calcium hydroxide. As a result, treated areas often have a darker appearance. Chemical remedies are typically most effective when large areas are treated. But the overall blend depends on the specific cause of the discoloration.

Gray Mottling Plaster Discoloration | Trouble Free Pool

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.

Mottled Skin (Livedo Reticularis): 8 Causes and Home Remedies

Mottled skin (livedo reticularis) is a skin condition that makes the skin appear net-like or patchy. The irregular patchy skin may look discolored due to changes in blood vessels, excessive sun exposure, or advanced age. This skin condition often appears as red patches on the arms, trunk, and leg areas which later turn purple or dark brown.

Notable failures of concrete structures : causes and remedies

upIntoageneralwreck-heapoftile,concrete,andsteelrods, thoughlargepartsof the roofremainedattached to thestand- ingparts and hanging down in strips. columns and girders

Avoid a Mottled Mishap | For Construction Pros

Concrete; Avoid a Mottled Mishap. Proper application of curing blankets and poly sheeting will help you avoid surface discoloration on concrete slabs. January 12, 2012.

Concrete Mottling Discoloration - ocapa.net

the moisture from the concrete will be absorbed into the sub-base at different degrees. This causes different water/cement ratios within the concrete slab. As the concrete sets, the concrete will be darker at the lower water/cement ratios and lighter in the areas where the water/cement ratios are higher. This will cause a mottling effect on the ...

CONTROL AND REMOVAL OF EFFLORESCENCE - NCMA

Since an acid treatment may slightly change the appearance, the entire wall should be treated to avoid uneven discoloration or mottled effects. Windows, doors, or surrounding materials may need to be protected during application. Calcium carbonate efflorescence is extremely difficult to remove.

Gel coat Faults, Causes and Remedies

Cause. Remedy. In Wet Gel Coat Cratering or Air Bubble. Failure of coating to form continuous, unbroken film leaving round or irregular shaped bare patches. 1. Contamination of mould surface. Wash mould surface with detergent and water – then polish. 2.

Mottled skin: causes and treatments - Netdoctor

Mottled skin treatment depends on the cause: In simple primary livido reticularis, no specific treatment is required apart from avoiding the cold. With other cases, the treatment depends on …

DIY Concrete Countertop - How to Make Concrete Countertops ...

DIY Concrete Countertop Mixing Steps. Add dry bulk (sand, aggregates) ingredients to the mixer first (but not the cement). Add the portion of mix with the pre-dissolved superplasticiser to the dry ingredients. For stiff concrete, hold back some of the plain mix water (about 1/4 to 1/3).

5 Creative Treatments for Concrete Floors

Plus, the use of certain stains can give the floor a mottled appearance, which helps to hide dirt. In this example, the concrete kitchen floor has been stained with a mottled brown treatment. There are several ways concrete can be colored, but one of the most visually interesting methods is to stain it using an acid product.

How to Remove Efflorescence from Concrete Block Walls ...

Preventing Concrete Efflorescence | Causes of Concrete Efflorescence | Concrete Efflorescence Removal | Does Sealing Stop Efflorescence? What is Concrete Efflorescence? Efflorescence is a crystalline salt deposit that can form in or on brick, concrete, stone, stucco, or other construction surfaces when water is present. It is white or greyish in color and is made up of salt …

Concrete Spalling 101: A Basic Guide For Your DIY Projects ...

Incorrect Concrete Application. The mixing, applying, and finishing of concrete on a surface can cause spalling once the concrete hardens. Just like baking a cake, mixing concrete requires precise measurements of cement, aggregates such as rock, sand, stone, and water. Overwatering concrete will reduce its durability and stability, resulting in ...

Flatwork Discoloration: Cause and Remedies| Concrete ...

Flatwork Discoloration: Cause and Remedies Folds and wrinkles in curing blankets become the location of water-evaporation and condensation cycles. By Kim Basham. Question: Last fall we placed a concrete sidewalk in front of a downtown office building. Because it was relatively cold weather, we used a winter flatwork mix and covered the slab ...

Surface Discoloration of Concrete Flatwork

concrete flatwork job. This discoloration may take the form of: (1) gross color changes in large areas of concrete caused as in Fig. l(a) by changes in the concrete mix; (2) spotted or mottled discoloration where light or dark blotches ap ear on the flat-work surface, as in Fig. 1(! ); and (3) early discoloration by light patches of "efflores ...

Damp Walls: Causes, Effects and Remedies | Buildings

Causes of Damp Wall 2. Effects of Dampness in Wall 3. Remedies. Causes of Damp Wall: There are various causes of ingress of moisture in walls which make them damp: i. Defective roof-leakage is a major source of water entering the wall and making it damp.

Lambert - Tips on Integrally Colored Concrete

concrete within the forms can cause discoloration and sand streaking. Forms that separate or pull away from ... cause a drying discoloration of the exposed area. Remedies for Discoloration: To remove most discoloration caused by chloride admixtures or finishing and curing methods, the first, and ... mottled discoloration. Before an acid is ...

Mottled Skin: Should You Be Concerned? - DonorCure.com

Mottled skin treatment depends on the cause and will vary based on its condition. If the mottled skin is caused by cold temperature, you or your loved one can do some cold-reducing measures to reduce mottling of the skin. You can turn up the central heating or use a heating blanket to warm up.

CIP 23 - Discoloration - Fischer Concrete

It may take the form of dark blotches or mottled dis-coloration on flatwork surface, gross color changes in large areas of concrete caused by a change in the ... "Discoloration of Concrete, Causes and Remedies," Kosmatka, S. H., Concrete Products, April 1987. 3. "Discoloration of Concrete Flatwork," Neal, R. E., Lehigh Port-

Identifying and Treating Lemon Tree Diseases ...

The lemon tree is perhaps the most popular of citrus fruit trees cultivated the world over. Diseases that attack this tree may be viral, bacterial or fungal in nature. Most of them are not fatal. However, it helps to recognize symptoms early and take appropriate action.

Concrete Surface Color Problems and How To Fix Them ...

The most common of these problems include discoloration from curing blankets, faded or severely washed-out color, and batch-to-batch color inconsistency. Once again, the biggest limitation is their need to penetrate. This means the surface being repaired needs to be free of all sealers and coatings.

Common Defects in Painting and Their Remedies - Happho

Causes Remedies; Setting. This defect occurs due to the settling of pigments to the bottom of the container and their failure to re-disperse. 1. To prevent this, avoid keeping the paint for long in warm conditions or directly in the sunlight. 2. If settling occurs, Stir the paint thoroughly to a uniform consistency and store it in favourable ...

Tablet defects - PharmaEducation

Causes and remedies of mottling. Causes: Remedies: Unequal particle size of coloring agent or pigment. Sieved before use to make equal size particles. A colored drug used along with colorless or white-colored excipients. Use appropriate colorants. A dye migrates to the surface of granulation while drying.

Common Tablet Defects: Causes and Remedies - …

4. Mottling/ Mottled appearance. This is typically seen with colored granules. Mottling is defined as an unequal distribution of color on a tablet with light and dark areas. Causes of mottling. Drug color different from other components; Dye migration to either the small or large granules during the granulation process

Honeycombs in Concrete - Their Causes and Remedies

Causes of Honeycombs in Concrete Honeycomb is due to non-reaching of concrete to all places due to which cavities and hollow pockets are created, main reasons are: Improper vibration during concrete. Less cover to reinforcement bars; Use of very stiff concrete (this can be …

Surface Mottling of Mortar Joints – Masonry Magazine

Surface mottling of masonry mortar occurs when on-site conditions and construction practices cause the extention or premature termination of the cement hydration. Densifying of the mortar at the surface of the mortar joint during finishing practices also can cause this surface condition. Hydration of portland cement cannot proceed if water is ...

Discoloration — What, why, & how? – Nevada Ready Mix

CSurface discoloration is the non-uniformity of color or hue on the surface of a single concrete placement. It may take the form of dark blotches or mottled discoloration on flatwork surfaces, gross color changes in large areas of concrete caused by a change in the concrete mix, or light patches of discoloration caused by efflorescence.

Concrete Slab Surface Defects: Causes, Prevention, Repair

Design and Control of Concrete Mixtures, EB001, and Diagnosis and Control of Alkali-Aggregate Reactions in Concrete, IS413. Crazing Crazing, a network pattern of fine cracks that do not penetrate much below the surface, is caused by minor surface shrinkage Concrete Slab Surface Defects: Causes, Prevention, Repair Figure 3.

Cracks In Concrete | Types | 7 Major Causes | Remedies | PPT

Masonry, concrete or mortar are Strong in compression But weak in tension or shear. This causes cracks in the structural member due to tension or shear. Click here to see the Best books for building maintenance on amazon. Principles Causes of Cracks and Remedial Measures: The main causes of cracks in houses are as follows: Moisture movement.

Sedum Problems | Home Guides | SF Gate

Sedum Problems. Sedum (Sedum spp.) is commonly called stonecrop, which describes their tough-as-nails growth habit. They are good "stone crops," thriving in …