The first piece of a series of concrete structures was lowered into the water off the coast of Miami Beach on Wednesday morning, a massive crane on the deck of a floating barge hoisting the unit into the air and sinking it ...
Ecology
Mar 6, 2023
0
50
There is no good place to be when a nuclear bomb goes off. Anything too close is instantly vaporized, and radiation can pose a serious health threat even at a distance. In between, there is another danger: the blast wave ...
General Physics
Jan 17, 2023
4
179
Racist segregation housing practices in the U.S. have had a genetic impact on urban wildlife, a new study by University of Manitoba in the Proceedings of the National Academy of Sciences reports.
Ecology
Oct 19, 2022
0
30
Seeing a larger number of species on urban coastlines—from marine animals to seaweed—is likely to improve the well-being of local people and visitors, new research from a team at Swansea University has revealed. The findings ...
Ecology
May 11, 2022
0
18
A novel approach to rubber recycling could see end-of-life tires repurposed into concrete for residential constructions as new research from the University of South Australia shows that it can provide an economically viable ...
Materials Science
Mar 30, 2022
1
54
The most common cause of degradation and failures of reinforced concrete structures is chloride-induced corrosion of its embedded steel. This is a pervasive, urgent problem that requires immediate attention and public awareness.
Condensed Matter
Mar 29, 2022
0
108
Concrete fractures that are invisible to the naked eye stand out in images produced through a technique created at Rice University.
Materials Science
Jan 25, 2022
1
382
Encountering concrete is a common—even routine—occurrence. And that's exactly what makes concrete exceptional.
Environment
Sep 16, 2021
0
84
It's a most unlikely habitat and really has no creature comforts to recommend it. But University of Delaware researcher Julie Maresca and students in her lab are studying concrete and the life that stubbornly persists within.
Cell & Microbiology
Aug 4, 2021
0
399
A major construction project in wetlands seen as one of the "green lungs" of smog-choked Mexico City has raised concerns for the future of the UNESCO World Heritage Site.
Environment
Jul 6, 2021
1
9
Concrete is a construction material composed of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel, 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, 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 which employs more than two million workers in the United States alone.[citation needed] More than 55,000 miles (89,000 km) of highways in the United States are paved with this material. Reinforced concrete and prestressed concrete are the most widely used modern kinds of concrete functional extensions.
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