What material provides semi-permanent, strong bonding with a concrete floor?

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Determine the scope of the problem.

The illustrations in this article show a repair where a slab reinforcing bar was too near the surface, and the concrete cracked. Other possible problems may include the following.

Ridges or humps left by the finishers. Expansion or contraction cracks. Properly installed concrete should have joints that prevent this unsightly cracking. For a 4-inch thick slab, joints should be spaced 8 to 12 feet apart. If jointing is not sufficient, or improperly placed, cracks can occur. Typically these cracks are not structural and only need to be repaired for aesthetic purposes. Debris like chunks of wood floating out of the concrete while it is still plastic (wet). Damage caused by heavy objects being dropped on the slab before it is cured. Surface scaling caused by improper finishing or freezing temperatures during curing. Scaling is when parts of the concrete surface flake away.

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Use a ruler to determine the length and width of...

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Most concrete cracks. That's a fact of life. Only the best concrete work will steer clear of cracking. But just give it enough time—it will crack.

Repair? Patch is more the word because it's impossible to truly stitch together a cracked concrete slab. Also, your patch will look like a patch; it will not blend it with the rest of the floor, though it will look better than before.

The great thing is that it's an easy job, requiring few materials.

Not only that, the materials (and tools) are inexpensive.

Difficulty: Easy

Time Required: 1 Hour Per 10 Linear Feet

Here's How:

Begin by running your chisel through the crack to remove any obviously loose chunks of concrete. Pull them from the crack with your fingers, if possible, or by knocking them free with a dull screwdriver.

Next, use the chisel and hammer to taper down the sides of the crack. This may seem counter-intuitive, but you need to get rid of the unstable edges of this crack and...

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Fact: Fresh wet concrete does not normally bond well to existing dry concrete. Do you remember elementary school where one of the subjects on which you were graded was “plays well with others”? Concrete would have gotten an F. There is nothing in basic portland cement that will act as a bonding agent. Portland cement concrete works well in mass and provides great compressive strength but not bond.

Concrete is marvelous stuff but in time it will deteriorate. When it does, you either have to patch it or replace it. Assuming that it is structurally sound the least expensive alternative is to patch it. However patching it requires some attention to detail or your patch will not last. So that you don’t waste too much time or money, we should probably discuss what “structurally sound” means. If your sidewalk has either heaved or dropped at almost every joint, repairing it will not provide a long-term solution. The slabs are likely still moving. If your slab has so much sand and...

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There are two basic methods for bonding a portland cement based product to existing concrete; 1) chemically and 2) mechanically.

Let’s discuss the mechanical approach first since it is really used in both approaches. The most effective way to ensure a really good bond is with a scratch coat. This is simply a very wet coat made up by mixing the repair product with water. Mix up a small amount of the repair material to a soupy consistency. You don’t need to measure the water-just turn the stuff into slop. Then, using a gloved hand or a rag, smear the material onto the area to be patched. Just think finger painting from kindergarten. The technique is about the same. Apply pressure to ensure that as much as possible is shoved into the nocks and crannies. You only need a thin coat. It is not necessary for this scratch coat to dry. By the time you get the repair material mixed it will be ready. Then mix up additional repair material to the proper consistency and apply over this...

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Alternate building materials are those which can be used economically by replacing the conventional building materials. Alternate building materials are made from waste products and thus it even minimizes environmental pollutions.

These alternate building materials can be used when it meets the respective specifications in the code of practice. Here some new materials and technology is discussed as well and a list many alternate materials for foundation, roof and walls are presented with details of each.

New Alternate Building Materials and Technology

Following are the new and alternate building materials used in construction works:

AluminumBitumen MaterialsSoil Conditioning AgentsTempered GlassCrumb RubberFiber Reinforced PolymerGlass Fiber Reinforced PlasticsBamboo reinforced plasticsFerro-cementPolyester Fibers

1. ALUMINIUM

More than 3000 commercialized applications.35 percent aluminum produced is used in construction.Non-Corrosive.High...
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мастерская, верхолаз, каменщик.

V. Find 13 pairs of synonyms.

VI. Find 8 pairs of antonyms.

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II.A few explanations to the text.

1. ... the first joint of the fingers – первыми фалангами пальцев 2. ... for a vast number of purposes – для многих целей

3. ... and they can be easier machined – и их легче обработать

III. Read and translate the text.

Modern Building Materials

Part I

Some of the most important building materials are: timber, brick, stone, concrete, metal, plastics and glass.

Timber is provided by different kinds of trees. Timbers used for building purposes are divided into two groups called softwoods and hardwoods. Timber is at present not so much used in building construction, as in railway engineering, in mining and in the chemical industry where it provides a number of valuable materials.

However, timber is still employed as a building material in the form of boards. For the interior...

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Understanding what’s Underfoot

A well laid and beautiful floor

The type of floors specified in building plans will determine the materials required as well as which sub-contractors or specialists are going to be involved in the building project. There are many floor coverings and floor finishes for our homes and buildings, but in construction there are only two basic types of floor structure from which we can choose. The one is made using concrete and the other is made with timber. Both may be used for ground-level floors and both may be used for upper storey floors. A third alternative, suitable only for ground floors, relies on using impervious floor units that are laid directly on compacted ground or fill.

Contractors work from building plans that show exactly how a building should be constructed. In most cases the finish will also be specified on the plans.

First we’re going to look at the different construction methods for floors. Then we’ll talk...

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CONSTRUCTION KNOWLEDGE >> CONCRETE >>

SLABS ON GRADE


1. How Does Concrete Work?
2. What are the Structural Basics for Concrete?
3. What is Reinforced Concrete?
4. What Should I Know About Rebar?
5. Why is the Amount of Water so Important for Concrete?
6. What Should I Know About Concrete Testing?
7. How Do I Get Concrete on the Job?
8. What Public Domain Documents are Available for Further Study?
9. Tricks of the Trade & Rules of Thumb for Concrete Basics:

How Does Concrete Work?


Modern concrete consists primarily of four components: Portland cement, sand, gravel and water. A common misconception with concrete is that it dries and gets hard. Actually, the hydraulic cement reacts with the water in a chemical process called hydration. As an example, concrete can be placed underwater and will still...

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Background

Concrete is a hardened building material created by combining a chemically inert mineral aggregate (usually sand, gravel, or crushed stone), a binder (natural or synthetic cement), chemical additives, and water. Although people commonly use the word "cement" as a synonym for concrete, the terms in fact denote different substances: cement, which encompasses a wide variety of fine-ground powders that harden when mixed with water, represents only one of several components in modern concrete. As concrete dries, it acquires a stone-like consistency that renders it ideal for constructing roads, bridges, water supply and sewage systems, factories, airports, railroads, waterways, mass transit systems, and other structures that comprise a substantial portion of the U.S. wealth. According to the National Institute of Standards and Technology (NIST), building such facilities is in itself one of the nation's largest ...

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Long Lasting Concrete Patch TIPS

Permanent concrete repairs are possible, well, nearly permanent. It's possible to expect a 20 - 30 year life expectancy from a properly executed repair. That isn't so bad if you ask me.

The trick to a long-lasting concrete repair lies in bonding the new material to the old material. Many people think that the new patching material will magically stick to the old concrete.

You need to understand the process of bonding.

CLICK HERE to get FREE & FAST BIDS from local concrete repair contractors.

The Magic Crystals

The concrete that makes up your steps, driveway, sidewalk, etc. is usually comprised of four basic ingredients: water, sand, gravel, and Portland cement. The cement is the glue that holds the sand and gravel together.

It does this my reacting chemically with the water that you add to the mixture.

Hydration

As soon as you add water to cement powder, a chemical reaction begins to...

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The professionals doing repairs at a workplace seem to be capable of patching stairs with material so tough, and make it stick to the existing cement with such strength, that the patching survives years of use, even when it is done on the tip of a stair, as shown below.

My own needs are far more modest. Still, I'd like this not to be a job that looks bad after six months, and that gets completely detached after twelve. My garage floor is abraded in a few places. No place is worse than the one letting air through under the garage door.

I know that I could use some cement, but that will not last very long. Can you guess what material has been used on the stairs above, or can you suggest some material that will provide a semi-permanent solution? I am quite happy using an entirely different color (I'll paint with an epoxy-based paint at some point anyway), just so long as it...

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AccessRec Beach Access Mats & Surfaces

AccessRec, LLC

DuraDeck* and AccessMat** Beach Access Mats have been specifically developed for use in permanent or temporary recreation access applications.

DuraDeck* is a unique molded plastic mat that is durable, lightweight, and extremely strong. Sections of 8' x 4' are engineered to provide ground protection and access over soft surfaces and will provide a firm support base and traction for numerous activities. DuraDeck sections can be carried by 1-2 persons and positioned easily as required on a job site. No tools are required for installation or removal.

AccessMat* is a portable and removable roll-out access mat that can be used in a multitude of applications for individuals of all abilities (pedestrians and wheelchairs access), as well as light vehicles including strollers, bicycles and ATVs. AccessMat is the most affordable, comfortable and durable material offered on the market.

Dimensions and...

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Loctite Clear Silicone is a multipurpose adhesive and sealant which creates a waterproof, protective seal that is ideal for metal, glass, rubber, tile and porcelain. It is designed to be used indoors and outdoors to repair everything from electrical connections to seams on boots to stop leaks in wet weather. Loctite Clear Silicone can be used to bond or repair saltwater or freshwater aquariums.

Recommended For

Bonding ABS, glass, ceramic, porcelain, wood, aluminum, stainless steel, cultured marble, fiberglass, granite, vinyl tile, some rubbers & plastics Sealing or repairing door frames, windows, vents, toys, appliances, gaskets, weather-stripping, outside of fireplace doors, shoes & boots

Not Recommended For

Aquariums greater than 30 gallons (114 L) and/or containing water greater than 18' (46 cm) in height. Marble, limestone, cement, concrete, brass, copper, magnesium, iron, zinc or galvanized metals. Polyethylene, polypropylene, polytetrafluoroethylene,...
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Carolina Equipment & Supply Co., Inc.

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