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Concrete is a construction material composed of cement (commonly Portland cement) and other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravels or crushed rocks such as limestone, or granite, plus a fine aggregate such as sand), water, and chemical admixtures. The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the past participle of "concresco", from "com-" (together) and "cresco" (to grow). Concrete solidifies and hardens after mixing with water and placement due to a chemical process known as hydration. The water reacts with the cement, which bonds the other components together, eventually creating a stone-like material. Concrete is used to make pavements, pipe, architectural structures, foundations, motorways/roads, bridges/overpasses, parking structures, brick/block walls and footings for gates, fences and poles. Concrete is used more than any other man-made material in the world. As of 2006, about 7.5 cubic kilometres of concrete are made each year—more than one cubic metre for every person on Earth. Concrete powers a US$35 billion industry, employing more than two million workers in the United States alone. More than 55,000 miles (89,000 km) of highways in the United States are paved with this material. Reinforced concrete, prestressed concrete and precast concrete are the most widely used types of concrete functional extensions in modern days. From Wikipedia under the
GNU Free Documentation License How to prepare soil for a concrete patio? Q. I am planning to have a concrete patio poured at my new house. How can I be sure the contractor is properly preparing the "underlayment" before pouring the concrete? I know that a certain amount of dirt should be removed (about 8"), that 3/4" gravel and fine gravel should add back about 4" when compacted, and that there should be a pre-soil treatment as well as a vapor barrier installed before the rebar goes down, but what else should I be sure gets done before the 4" thick concrete gets poured? Also, what PSI rating should the concrete be for this type of application? I am in the Southern California area, in case weather is a concern. Asked by djasail - Thu Jun 1 13:44:41 2006 - - 5 Answers - 0 Comments A. The newly updated standards for ground-supported monolithic concrete flooring is to ONLY use vapor barrior when it is an area that is air-conditioned. So, if your patio is "open-air" like a porch and garage, and will not have conditioned air above it, then do not use any vapor-barrior. Stand firm on this, as vapor barrior pushes too much water to the surface during concrete curing and can cause more cracks then needed. Dampen the ground before placing the concrete so that the dirt does not wick moisture away from the fresh concrete. This will also help in cracking. Vibrate the concrete, if you can, by tapping on the form-boards with a hammer. Place #4 rebar at a minimum of 12 inches on center, and tied at intersections with wire-tie [cont.] Answered by GraceHead - Fri Jun 2 18:31:06 2006 What causes concrete and fence block to deteriorate at certain times of the year and is there a fix? Q. Seems to be in the winter or after a lot of rain. Happens to concrete patio too. A white residue forms and then the concrete or blocks start to slowly fall apart. Asked by Mike H - Tue Jun 3 16:47:18 2008 - - 2 Answers - 0 Comments A. Moisture freezing in them bust them up and then they deteriorate later. Some times the original pour of concrete was too wet and in the moisture and rain they fall apart. Answered by Thor - Tue Jun 3 17:22:58 2008 What concrete steps should the Indian government take to safeguard security of Indians living abroad?
Q. There has been a rise in number of Indian students moving to other countries for their education. There has also been a rise in the incidents of racial attacks on Indian students abroad. With the help of facts, figures and specific examples evaluate the extent of this problem. In what way is it going to affect the movement of Indian students to study abroad? What concrete steps should the Indian government take to safeguard security of Indians living abroad? Asked by Dr. Sam - Tue Feb 16 10:43:48 2010 - - 7 Answers - 0 Comments A. Indians living abroad are far more safer then the Indians living in India. Still if you fear then come to india and join politics, you will get enough security. Answered by Jose - Tue Feb 16 10:49:42 2010 From Yahoo Answer Search: "Concrete"
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 prnewswire.com Tue, 24 Aug 2010 13:13:31 GMT+00:00 PR Newswire (press release) All you need is WarmlyYours Floor Heating for Concrete to turn any sunroom, patio, basement or garage into a room that can be enjoyed all year, ...  reuters.com Mon, 23 Aug 2010 17:02:07 GMT+00:00 Reuters Karzai's plan to rid the capital of concrete barriers, which many residents think turn the capital into a military fort, has been tried before but was never ... Afghans start to remove Kabul roadblocks Newstalk ZB Afghan capital removing its protective blast walls The Associated Press  jsonline.com Tue, 17 Aug 2010 21:17:54 GMT+00:00 truck driver killed in accident Milwaukee Journal Sentinel A 36-year-old concrete truck operator who was killed in an industrial accident Monday morning in Kenosha County was ... Concrete truck driver killed in accident Milwaukee Journal Sentinel From Google News Search: "Concrete"  watching-grass-grow.com 480px x 704px | 40.70kB [source page] Construction Ghost Pouring the concrete garage floor concrete video Crane installs a steel beam floor crane video  hortons-portablebuildings.co.uk 480px x 640px | 74.90kB [source page] http www hortons portablebuildings co uk concrete garages ultimate apex concrete garage 01 jpg From Yahoo Image Search: "Concrete"  creativelifestylereviews.com Lifestyle Editor hu, 02 Sep 2010 08:03:13 GM Concrete. stop walls serve all kinds of needs. They are used for retaining walls. They is usually used for fences. The one factor they have in frequent is they're boring to appear at! Should you would like to boost the appearance of a ... From Google Blog Search: "Concrete"  video.google.com Fri, 04 Aug 2006 16:15:33 PDT Bob Vila presents a do it yourself concrete staining video. View techniques for acid staining concrete and concrete floor staining. All Bob Vila ... video.google.com.  ehow.com Wed, 23 Dec 2009 10:50:50 PST "Hi I'm Tim Gipson and I'm going to talk to you about how to measure yardage for concrete and concrete is sold by the yard. So when ... ehow.com.  youtube.com Fri, 08 Sep 2006 10:03:59 PDT Zakk Wylde and his Black Label Society welcome you to take a ride through their, at once nightmarish and hilarious, vision of the "Concrete ... youtube.com. From Google Video Search: "Concrete" |
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