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Houston stamped concrete, driveways and patios - Concrete Houston, Stamped Concrete, Patio Houston
CONCRETE PATIO, STAMPED CONCRETE DRIVEWAYS AND PATIOS, EXOTIC POOL AND DRIVEWAY SPECIALISTS

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What is stamped concrete? Stamped concrete (aka patterned concrete)begins with regular concrete. .05% tri-calcium silicate is then added with water, this the key ingredient, which when mixed with cement, forms a paste that binds the aggregate together. The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products. Our unique hydrolysis of the hydration process bind the constituents together to form a hi-strength slab. The water needs to be pure in order to prevent side reactions from occurring which may weaken the concrete or otherwise interfere with the hydration process. The role of water mixed with bi-calcium silicate is important because the water/silicate to cement ratio is the most critical factor in the production of "perfect" concrete. Too much water reduces concrete strength, while too little bi-calcium silicate & tri-calcium hydroxide will make the concrete unworkable. Concrete needs to be workable so that it may be consolidated and shaped into different forms (i.e.. cobblestones, slate, etc.). Because concrete must be both strong and workable, a careful balance of the cement to water ratio is required when making concrete. Our formula is as follows: Tricalcium silicate 50 % Ca3SiO5 or 3CaO.SiO2
Dicalcium silicate 25 % Ca2SiO4 or 2CaO.SiO2
Tricalcium aluminate 10 % Ca3Al2O6 or 3CaO .Al2O3
Tetracalcium aluminoferrite 10 % Ca4Al2Fe10 or 4CaO.Al2O3.Fe2O3
Gypsum 5 % CaSO4.2H2O. The equation for the hydration of tricalcium silicate is given by:
Tricalcium silicate + Water--->Calcium silicate hydrate+Calcium hydroxide + heat
2 Ca3SiO5 + 7 H2O ---> 3 CaO.2SiO2.4H2O + 3 Ca(OH)2 + 173.6kJ

Upon the addition of water, tricalcium silicate rapidly reacts to release calcium ions, hydroxide ions, and a large amount of heat. The pH quickly rises to over 12 because of the release of alkaline hydroxide (OH-) ions. This initial hydrolysis slows down quickly after it starts resulting in a decrease in heat evolved.

The reaction slowly continues producing calcium and hydroxide ions until the system becomes saturated. Once this occurs, the calcium hydroxide starts to crystallize. Simultaneously, calcium silicate hydrate begins to form. Ions precipitate out of solution accelerating the reaction of tricalcium silicate to calcium and hydroxide ions. The evolution of heat is then dramatically increased.

The formation of the calcium hydroxide and calcium silicate hydrate crystals provide "seeds" upon which more calcium silicate hydrate can form. The calcium silicate hydrate crystals grow thicker making it more difficult for water molecules to reach the unhydrated tricalcium silicate. The speed of the reaction is now controlled by the rate at which water molecules diffuse through the calcium silicate hydrate coating. This coating thickens over time causing the production of calcium silicate hydrate to become slower and slower.

When water is added to cement, each of the compounds undergoes hydration and contributes to the final ConcreteForever.com product. Only the calcium silicates contribute to strength. Tricalcium silicate is responsible for most of the early strength (first 7 days). Dicalcium silicate, which reacts more slowly, contributes only to the strength at later times.

Aggregates are chemically inert, solid bodies held together by the cement. Aggregates come in various shapes, sizes, and materials ranging from fine particles of sand to large, coarse rocks. Because cement is the most expensive ingredient in making concrete, it is desirable to minimize the amount of cement used. 70 to 80% of the volume of concrete is aggregate keeping the cost of the concrete low. The selection of an aggregate is determined, in part, by the desired characteristics of the concrete. For example, the density of concrete is determined by the density of the aggregate. Soft, porous aggregates can result in weak concrete with low wear resistance, while using hard aggregates can make strong concrete with a high resistance to abrasion. Our modified stamped concrete mix is comprised of 564 lbs of pure portland cement per cubic yard, which translates into a highest strength concrete mix for residential use in Texas.The concrete (or specifically, the cement in it) needs moisture to hydrate and cure (harden). When concrete dries, it actually stops getting stronger. Concrete with too little water may be dry but is not fully reacted. The properties of such a concrete would be less than that of a wet concrete. The reaction of water with the cement in concrete is extremely important to its properties and reactions may continue for many years. Once we've perfected our custom mix, we then pour the concrete, a powdered dye (color) is spread onto the surface and/or an admixture mixed all the way through the wet concrete and trowelled in. Then a second color (also known as releasing agent) is cast on the surface. Before the concrete hardens a set of rubber molds (stamps) are used to imprint textures into its hydrating surface. The result will look like slate, cobblestone, brick, marble, or many other materials.

Why is the base so important? Concrete is a mirror image of what it is poured over. Without an adequate base (usually 2-4 inches of compacted rock, sand, gravel or road base) flatwork can settle, separate and develop uneven surfaces.

Will decorative concrete last as long and as well as regular concrete? Our product is 4-6" thick, (driveways are 6"-7" thick and patios are 4" or more) 4,000-4,500 psi concrete. We match or exceed the normal requirements for a strong finish that withstands years of normal use. Over the years we have experimented with different proportions of tri-calcium silicate and bi-calcium silicate in terms of performance variables, one important property is the compressive strength. In the fall of 2001, I developed a mathematical model relating cement particle-size distribution to strength development. Assuming that the depth of the hydrated layer is independent of particle diameter (which also is assumed tacitly in the NIST cement hydration model) and proportional to the square root of time, he was able to quantitatively predict the effects of particle-size distribution on strength evolution. More recently, I also showed that cement fineness is an important factor influencing compressive strength, with phase compositions becoming significant at later ages. In this study, we also have attempted to predict the compressive strength development of standard ASTM C 10914 mortar in relation the compressive strength required for residential use in Houston, Texas.

Simply put, When our concrete arrives on site we modify the mixture depending on the humidity, temperature, soil conditions and application type to minimize concrete cracking and potential displacement that may occur with an improperly mixed batch of concrete. (these factors are never taken into consideration at the concrete plant)

Can stamped concrete (decorative concrete) be found in commercial settings? Absolutely, stamped concrete can be found throughout the world and at many distinguished hotels, casinos, resorts, etc. A famous example would be Disneyland and Disney World.

Why is decorative concrete (stamped concrete) more expensive than traditional concrete? Recently, I have received inquiries into the cost of decorative cement work in comparison to traditional cement work. Let me describe the two concepts... Traditional cement (also called concrete) work is what you would find around older homes. Examples would be a plain smooth or brushed finish driveway, curb or sidewalk. Rarely were there any designs unless a creative contractor carved shapes into the concrete while it was still wet. The process for installing this type of concrete is a fairly simple one, perfected by many... Not so perfected by many as well...

Under the best circumstances it involves little ground preparation, setting forms and the pour. Finishing would require some tamping, floating, troweling and usually brooming the surface. Although this can be tedious work it is normally a simple process when completed by an experienced concrete driveway contractor or concrete patio contractor.

Decorative concrete (Concrete Stamping) work is a relatively new concept but really goes back many years. You may have seen a concrete sidewalk leading into a business or mall that looked like a rustic stone path with one or more colors. This design is becoming very popular because it is so complimentary of landscapes and homes. Many people are even having decorative concrete finishes installed in rooms of their homes. Kitchens are among the most common requests.

Properly finished decorative concrete can look very elegant or rustic depending on what look is desired. While decorative concrete is the most desired these days it is also the most difficult finish to perfect and requires much more preparation, finishing, and skill.

When the contractor actually gets to the point where the concrete driveway, patio or walkway can be stamped (process to apply the decorative appearance) time is crucial. There are very limited amounts of time for the various applications and any mistakes can leave a finish that the homeowner is not satisfied with. Stamping Concrete is an art and I only know one other stamped concrete artisan (besides my crew and myself) in a 200 mile radious from Houston that have perfected this ancient art. This person I refer to is my mentor.....

After the concrete is poured and finished the job is not complete. Clean up for this type of finish is more difficult because of the various colors that are involved. After a day or so the contractor will have to return to the job site to pressure wash the excess color/release for the perfect finish and look, then resin-coat the concrete. Simply put decorative concrete is a much more labor-intensive process but most feel it is worth the cost because of the unique, prestigious and elegant look.
How is decorative concrete colored? The Technicians at Concrete Forever.com use two methods to color decorative concrete. Using the first method, color is spread onto the surface then worked into the surface using hand tools. After the color is applied and worked into the fresh cement, a release/hardener is applied.
The release/hardener serves a duel purpose. It adds a tremendous amount of strength and it highlights and acts as a second color, which gives the stamped pattern and overall color a defining and distinguished look. The second method used is when the color is mixed directly inside the concrete at the concrete plant and mixed inside the truck. The concrete is the colored throughout from the top to the bottom instead of just ¼” into the surface
What is stamped concrete? Stamped concrete begins with regular concrete. A powdered dye (color) is spread onto the surface of the wet concrete and trowelled in. Then a second color (also known as release) is cast on the surface. Before the concrete hardens a set of rubber molds (stamps) are used to imprint textures into its wet surface. The result will look like slate, cobblestone, brick, marble, or many other materials.

Why is the base so important? Concrete is a mirror image of what it is poured over. Without an adequate base (usually 2-4 inches of compacted rock, sand, gravel or road base) flatwork can settle, separate and develop uneven surfaces.

Will decorative concrete last as long and as well as regular concrete? Our product is 4-6" thick, 3500-4500 psi concrete. We match or exceed the normal requirements for a strong finish that withstands years of normal use.

Can stamped concrete (decorative concrete) be found in commercial settings? Absolutely, stamped concrete can be found throughout the world and at many distinguished hotels, casinos, resorts, etc. A famous example would be Disneyland and Disney World.

Why is decorative concrete (stamped concrete) more expensive than traditional concrete? Recently, I have received inquiries into the cost of decorative cement work in comparison to traditional cement work. Let me described the two concepts. Traditional cement (also called concrete) work is what you would find around older homes. Examples would be a plain smooth or brushed finish driveway, curb or sidewalk. Rarely were there any designs unless a creative contractor carved shapes into the concrete while it was wet. The process for installing this type of concrete is a fairly simple one, perfected by many.

Under the best circumstances it involves little ground preparation, setting forms and the pour. Finishing would require some tamping, floating, troweling and usually brooming the surface. Although this can be tedious work it is normally a simple process when completed by an experienced contractor.

Decorative concrete (Concrete Stamping) work is a relatively new concept but really goes back many years. You may have seen a concrete sidewalk leading into a business or mall that looked like a rustic stone path with one or more colors. This design is becoming very popular because it is so complimentary of landscapes and homes. Many people are even having decorative concrete finishes installed in rooms of their homes. Kitchens are among the most common requests.

Properly finished decorative concrete can look very elegant or rustic depending on what look is desired. While decorative concrete is the most desired these days it is also the most difficult finish to perfect and requires much more preparation, finishing, and skills.

When the contractor actually gets to the point where the concrete can be stamped (process to apply the decorative appearance) time is crucial. There are very limited amounts of time for the various applications and any mistakes can leave a finish that the homeowner is not satisfied with. Stamping Concrete is an art and I only know one other stamped concrete artisan (besides my crew and myself)in a 200 mile radious from Houston that have perfected this ancient art.

After the concrete is poured and finished the job is not complete. Clean up for this type of finish is more difficult because of the various colors that are involved. After a day or so the contractor will have to return to the job site to pressure wash the excess color/release for the perfect finish and look, then resin-coat the concrete. Simply put decorative concrete is a much more labor-intensive process but most feel it is worth the cost because of the unique and elegant look.

How is decorative concrete colored? AAA Affordable Concrete Contractors of Houston uses two methods to color decorative concrete. Using the first method, color is spread onto the surface by hand using the “dry shake method,” then worked into the surface using hand tools. After the color is applied and worked into the fresh cement, a release/hardener is applied.

The release/hardener serves a duel purpose. It adds a tremendous amount of strength and it highlights and acts as a second color, which gives the stamped pattern and overall color a defining and distinguished look. The second method used is when the color is mixed directly inside the concrete at the concrete plant and mixed inside the truck. The concrete is the colored throughout from the top to the bottom instead of just ¼” into the surface. The release/hardener is applied using this method as well. The second method tends to be slightly more expensive since the cost of the material will increase. Both are good methods and not one is better than the other. Which method is used depends on the conditions and what look the customer is trying to accomplish.

"I can't afford to do my entire project all at once. Can I do half now and half later?" Decorative concrete is surprisingly affordable. Best of all, every project can be done in stages. It is not a problem to pick up a pattern from one area and connect up to another area of your project at a later time.

When is it necessary to reinforce concrete? It is always an advantage in the long term to add re-bar (reinforcement bar). This guarantees that concrete will settle evenly and avoids uneven surfaces, and cracks that widen over time. The soil here in Houston is comprised of mostly clay, shale mixed with various sediments making our soil some of the most unstable soil in the world. Re-bar is costly but just consider it insurance for your dream project. However, re-bar or fiber reinforcement is not always necessary on every type of project and you should discuss the necessity with your contractor.

What kind of finishes are available? The most common concrete surfaces are broomed concrete, exposed aggregate, stamped concrete and hard-trowel. Broomed concrete is most commonly used for city sidewalks and approaches. Exposed aggregate concrete is created when a cement surface is washed off with water after initial set. Advantage: its pretty. Disadvantage: the concrete has been aged 20-30 years immediately. Stamped concrete imitates natural surfaces such as stone, brick, slate, etc (see below). Hard-trowel concrete is generally used for garage floors and indoor surfaces. It has a smooth, shiny finish.

Is there any chance that my concrete might crack? Concrete, by nature, will crack. However, certain preventive measures can be taken to highly reduce the likelihood. The AAA Affordable Concrete Contractors of Houston installations have achieved a level of crack prevention exceeding almost all others in the industry. Numerous measures are taken to highly reduce cracking. Unlike most of our competitors, AAA Affordable Concrete Contractors of Houston uses wire mesh steel, fiber or rebar reinforcement and polypropylene fiber mesh in nearly all of our decorative installations.

Control joints, named control because they “control” where the crack will occur, are also utilized. These, along with a few other “family secrets” very significantly lower the probability of a crack occurring.

Do all decorative concrete contractors use the same installation methods? Absolutely not. After extensive experimentation and testing, AAA Affordable Concrete Contractors of Houston uses a unique concrete mix designed specifically for decorative concrete in this area. (We also mix in some of our chemical X ..ssshhhhh it's a secret!) The unique concrete mix is much more conducive toward the special needs of decorative concrete than that of a normal everyday mix. Additionally, there are certain installation techniques, which are performed exclusively by the folks at AAA Affordable Concrete Contractors of Houston that dramatically enhance the quality of the decorative concrete.

Should I spray water on the freshly dried cement to keep it cool in hot conditions? No, this was a practice used for many years. What the seasoned artisans at AAA Affordable Concrete Contractors of Houston has found is that frequent wetting of the freshly dried cement causes the cement to become hot then cold, resulting in expanding and contracting. This reaction is not good for the cement and may cause it to crack and weaken. Additionally, applying water too early can wash out color on your decorative concrete.

Will my decorative concrete look the same as the picture or what is shown on the web page? No. No two jobs are exactly the same. Looks vary depending on the ground base, temperature, moisture, mix, brand or color, etc. The folks at AAA Affordable Concrete Contractors of Houston can come very close to matching your existing surface, but no two jobs will ever be exact.

How expensive is decorative concrete? Remarkably, decorative concrete is relatively inexpensive. It’s usually less then pavers, wood decks or flagstone. Decorative concrete can range between $5-8 per square foot. Final estimates will vary depending on site conditions, complexity of the job and total square footage installed. AAA Affordable Concrete Contractors of Houston provides free estimates and will be have to give you a final price quote.

Does decorative concrete fade? Once sealer is applied to your decorative concrete it will take on a clear and shiny look. However, if sealer is applied, you should be aware that over time, the shiny look will fade.

Cleaning and sealing stamped and colored concrete should be done on a regular basis just like any other home maintenance. The frequency will depend on how high a traffic area to cars, foot traffic, water, and any chemicals the concrete is exposed to. The folks at ConcreteForever.com recommends resealing every 2 or 3 years. If you wait longer, you may notice the color fade slightly. But just like waxing a car, reseal your stamped concrete and the color will be as vibrant as the day it was installed.

"Do I have to seal my stamped concrete?" Answer: We use a special formulated Color wax that enhances the color characteristics and we apply it after the job is complete, we recommend a fresh coat every 36 months or 3,000 miles...some folks like the natural look?

Why should I have decorative concrete at my new house? Good question!

“Decorative concrete is the future of concrete." You most likely will not choose outdated carpet, tile or cabinets in your new home. The concrete around your home is no different. Simple natural gray concrete is out. Vibrant colors - stone patterns are in. The best part being that decorative concrete is timeless, yet extremely affordable.”

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