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Concrete is the primary construction material of a home foundation or a commercial foundation. Concrete is the most widely used construction material in the world. Every year more than one cubic meter of concrete is produced for every person on the planet. It is widely used for the construction of highways Cheap Womens Air Max 270 , buildings, bridges, water and sewage pipes, concrete blocks Cheap Womens Air Max 720 , poles, and many other items. Reinforced concrete and prestressed concrete are widely used in all parts of the world. Standard concrete consists of cement (often referred to as Portland cement), aggregates such as gravel and sand, and water. When these ingredients are mixed together the water and the cement begin a chemical reaction call hydration. This chemical reaction will bond or cement all of the ingredients together and result in a stone-like material that is called concrete.

Concrete can trace its history back to the Roman empire. The Romans were the first to use this revolutionary material and it aided in the construction of many Roman structures that still survive today. It was found to be far superior to the structures that will built of stone or brick. Modern tests have demonstrated that Roman concrete has a compression strength as strong as today's concrete. The Romans also experimented with the concrete by adding horsehair and other additives to improve its strength or create other properties. The secret of making Roman concrete was lost for 1300 years until 1756 when a British engineer discovered the basic formula once again.

Concrete can be fabricated in a multitude of ways to achieve a final product with specific properties. Some of the variations include varying the proportions of the ingredients Cheap Womens Air Max 90 , changing the basic ingredients, adding reinforcement, adding chemical admixtures, and adding mineral admixtures. Variations in the amount of water added to a concrete mixture will affect the strength of the final product. Adding more water will yield a wet mixture that is freer-flowing and easier to use in difficult applications but the final concrete will have less strength. Using less water will create a wet mixture that will yield a stronger final concrete but it will less free-flowing.

Aggregates are the bulk of the concrete mixture and usually include sand (fine aggregate) Cheap Womens Air Max 95 , natural gravel, and crushed stone. Today more aggregates are from recycled building materials and waste materials such as blast furnace slag. Recycled aggregates are being used more frequently because they place less stress on the environment.

Concrete has a very high compression strength but a very weak tension strength. In other words, it is rigid and will support great weights but it will not bend. If bending forces are great enough the concrete will break. Concrete that is reinforced with steel bars or various types of fibers will have a higher tensile strength and can resist greater bending forces. Virtually every home foundation and commercial concrete foundation built in the past sixty years in the United States contains steel rebar for higher tensile strength.

Chemical admixtures are materials that are added to concrete mixtures to obtain a specific property. These admixtures would include materials that could speed up or slow down the hydration process for specific building requirements. Simple pigments can be added to change the color of the concrete. Plasticizers allow concrete to be "worked" or poured and placed more easily without adding any additional water. Therefore the strength and durability of the concrete can be maintained while having a wet mixture that can be easily "worked."

Recent environmental concerns have been raised about the manufacture of cement, which contributes about five percent of all carbon dioxide emissions worldwide. Roughly forty percent of these emissions are from the burning of fossil fuel to create cement. Roughly fifty percent of these emissions are from the chemical process during manufacture. Therefore cement experts are searching for alternative materials and methods to produce cement or a similar material.For those who are looking for luxury homes for sale Cheap Womens Air Max 97 , they need not look further than the internet. Indeed, this has become the easiest way to look for just about anything, but a luxury home does take some finding for sure. The sites offering this kind of accommodation are really targeting high end earners since some of these houses come in at a million or more. However, there are usually bargains to be had even for those who can afford just about anything they want.

As one would expect Cheap Womens Air Max Classic BW , these websites offer superb views of the houses they have on offer. Professionally photographed in most instances, the prospective buyer gets a birds-eye view of everything inside and outside the house. The inside, usually documented fully with details of room sizes etc, is photographed with furniture inside to give the buyer an idea of how much room there is. Although most people do not know this Cheap Womens Air Max Deluxe , a house is much easier to sell when it has been 'dressed' because people can then imagine themselves living in this space. An empty room says nothing to the buyer and these houses tend to be on the market a bit longer than the dressed variety.

In fact, since some of the furniture was actually bought just for this particular house, most of the sellers will sell the whole thing, furniture and fittings included. However Cheap Womens Air Max DLX , this should be checked thoroughly before signing contracts of course. Some people will always want large and bright rooms so that the house is filled with light all day. Others will want to preserve artwork etc so they are not too bothered about how much light comes in and may actually put up heavy window dressings to stop the light altogether. However, since windows can always be blocked, it may well be better to go for the light and spacious house in the first place and then make it fit the requirements of the homeowner.

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