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Concrete is a composite material composed of coarse aggregate bonded together with a fluid cement that hardens over time. Most concretes used are lime-based concretes such as Portland cement concrete or concretes made with other hydraulic cements, such as ciment fondu. However, asphalt concrete, which is frequently used for road surfaces, is also a type of concrete, where the cement material is bitumen, and polymer concretes are sometimes used where the cementing material is a polymer.
When aggregate is mixed together with dry Portland cement and water, the mixture forms a fluid slurry that is easily poured and molded into shape. The cement reacts chemically with the water and other ingredients to form a hard matrix that binds the materials together into a durable stone-like material that has many uses. Often, additives (such as pozzolans or superplasticizers) are included in the mixture to improve the physical properties of the wet mix or the finished material. Most concrete is poured with reinforcing materials (such as rebar) embedded to provide tensile strength, yielding reinforced concrete.
Famous concrete structures include the Hoover Dam, the Panama Canal, and the Roman Pantheon. The earliest large-scale users of concrete technology were the ancient Romans, and concrete was widely used in the Roman Empire. The Colosseum in Rome was built largely of concrete, and the concrete dome of the Pantheon is the world's largest unreinforced concrete dome. Today, large concrete structures (for example, dams and multi-storey car parks) are usually made with reinforced concrete.
After the Roman Empire collapsed, use of concrete became rare until the technology was redeveloped in the mid-18th century. Today, concrete is the most widely used man-made material (measured by tonnage).
Christmas light time this weekend... all is good except I have a fairly steep concrete driveway and need a way to keep my ladder from slipping out underneath me. I figured I'd back my truck in and use it as a giant cleat, but was wondering if there was an easier way. The slope is much steeper...
old light pole base. Needs to go. My old dairy tractor won’t budge it! Gotta be 1,000lbs.
Rebar. Rock. It’s got it all.
How would you guys do it?
It old and hard hell!!!!!!!!!!!
I’ve been trying to be cheap. Jackhammer won’t touch it.
I'm selling all of my concrete flat work equipment.
Just think how much fun and money you'll save doing your own concrete jobs.
I have a 5' & 4' bull float, 10' magnesium bull float, Fresno finishing trowel all with rocket heads.
Used once knee boards, tamper, extension poles, bronze edger (not...
City of Milwaukee considers banning company over KKK sticker, firearms displays
So here is my take on this. In the story it says the company has 50 million worth of contracts with just the city. So this is a big construction outfit.... And they had a couple of employees who sound like bad...
Due to two back to back years of rotting pumpkins on the porch, I’ve got some stains that won’t come up. I’ve tried CLR, bleach and a few other things to no avail. Any options to clean this, or is this just a permanent decoration on my porch?
The stain in question:
One of the fascinating mysteries of Ancient Rome is the impressive longevity of some of their concrete harbour structures. Battered by sea waves for 2,000 years, these things are still around while our modern concoctions erode over mere decades.
Why 2,000 Year-Old Roman Concrete Is So Much...