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Concrete admixtures are a method of changing or improving concrete; the additives may change the color, setting time, as well as other properties of the concrete. One such additive known as calcium chloride has been used in Concrete for years because it helps the concrete to set, even in colder temperatures.

Today the construction industry is seeing new concrete admixtures that help expand the uses of concrete. To make the most of these concrete admixtures, a basic knowledge of the admixtures is necessary in order to ensure that you have the right concrete for the job. Concrete can be expensive so you will want to eliminate any chance that you will use the wrong type of concrete admixture for the job you are trying to complete.

There are five categories of concrete additives, which are classified according to their uses. In addition to these types of concrete admixtures, there are also some with functions that include, color, damp proofing, reducing shrinkage, and bonding. The type of concrete admixture that you will need depends on what properties the concrete will need. For instance, if you will be laying concrete for a patio in a very wet climate, you may need a concrete additive that includes damp proofing and shrinkage reduction.

Concrete admixtures with an accelerant essentially shorten the set time of the concrete. This type of admixture is often used in colder climates where it may be necessary to have a shorter setting time that will allow for the early removal of forms and surface finishing.

The water reducing concrete admixtures reduce the amount of water needed in the concrete mixture, which is commonly used in hot climates. This concrete admixture may reduce the set time of the mixture.

Another common concrete admixture is the air-entraining admixture. This type of concrete will contain small air bubbles, which help to maintain the concrete’s durability in colder climates where it will be exposed to freezing and thawing cycles.

Bonding concrete admixture is used when you are attempting to add new concrete to old concrete. The bonding is accomplished by creating an admixture that contains compounds such as, polyvinyl chlorides and acetates, acrylics and butadiene-styrene co-polymers.

Concrete admixtures that provide waterproofing and resistance against dampness are often used when it is necessary to decrease the amount of moisture that is able to seep into the large pores of the concrete. This type of concrete admixture may contain substances such as soaps, butyl stearate, and mineral oil, as well as asphalt emulsions.

The retarding concrete admixtures work by slowing down the hydration of the concrete, and lengthening the set time. This type of concrete admixture is mostly used in hot weather as it slows down the set time that may be accelerated because of the higher temperature.

The superplasticizer concrete uses water-reducing admixtures, which allow for high range water reduction, but without slowing the set time of the concrete. One of the main advantages to this type of admixture is that it adds strength to the concrete.

In recent times, adding color to concrete has become more common, though this is normally done for patios or walkways. The coloring procedure involves adding the color to the surface of the concrete, which will not only change the color of the finished product, but also provides the added benefit of hardening the concrete surface.

In most cases the concrete admixture will be influenced by several different factors, such as the water-cement ratio, grading, temperature, as well as the type and brand of cement that is used. Using a concrete admixture requires experience to ensure that when adding the different compounds to the concrete, it is done correctly as to not ruin the finished product with some of the negative effects that may be present with some admixtures.

For example, when you are using a retarding concrete admixture, it is possible that as the concrete will stiffen quickly, placing and finishing the concrete may become difficult. For this and several other reasons, not only should the decision to use a certain type of concrete admixture be left to an experience professional, but also all alternatives to concrete admixture should be considered before making the decision to use a certain admixture. Mistakes in this area could be extremely costly.

If it is decided that using a concrete admixture is appropriate for the job, you should be able to find admixture concrete at most concrete supply retail stores. If your job requires a special mixture you may have to have the concrete supply store special order the admixture that you need from a construction chemicals manufacturer.

When you receive your concrete admixture it will come with mixing instructions that should be fairly easy to understand and implement. The complexity of concrete admixture is not so much in mixing and using the concrete, as it is in understanding which type of concrete admixture should be used for each type of job.

When used correctly, concrete admixtures can be very beneficial in producing certain qualities in a finished product, but it is important that you only use the highest quality concrete admixture available.

If you are unsure that a concrete admixture would be right for your project, it is best to consult with a professional to help you decide which concrete admixture you will need to achieve the desired finished product, or even if an admixture is necessary at all.

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This entry was posted on Thursday, October 16th, 2008 at 1:30 pm and is filed under Industry products. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.