News tagged with cement
Solar thermal process produces cement with no carbon dioxide emissions
(Phys.org) -- While the largest contributor to anthropogenic greenhouse gas emissions is the power industry, the second largest is the more often overlooked cement industry, which accounts for 5-6% of all ...
Apr 10, 2012 |
4.6 / 5 (25) |
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Shrimp-like crustacean found to make gooey underwater silk
(PhysOrg.com) -- Fritz Vollrath and colleagues from Oxford University have been analyzing the gooey material produced by tiny amphipods known as Crassicorophium bonellii, a small shrimp-like creature that p ...
Nov 23, 2011 |
4.7 / 5 (3) |
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Cement's basic molecular structure finally decoded
(PhysOrg.com) -- In the 2,000 or so years since the Roman Empire employed a naturally occurring form of cement to build a vast system of concrete aqueducts and other large edifices, researchers have analyzed the molecular ...
Nanotechnology / Nanomaterials
Sep 09, 2009 |
4.2 / 5 (16) |
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Engineers develop cement with 97 percent smaller CO2 and energy footprint
Drexel engineers have found a way to improve upon ordinary Portland cement (OPC), the glue that's bonded much of the world's construction since the late 1800s. In research recently published in Cement and Concrete Composites ...
Feb 21, 2012 |
4.9 / 5 (11) |
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Recipe for success: Recycled glass and cement
(PhysOrg.com) -- Michigan State University researchers have found that by mixing ground waste glass into the cement that is used to make concrete, the concrete is stronger, more durable and more resistant ...
Feb 21, 2012 |
4.9 / 5 (8) |
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Chemically scrubbing CO2 from the air too expensive
(PhysOrg.com) -- While it is possible to chemically scrub carbon dioxide from Earth's atmosphere in order to lessen the severity of global warming, the process is prohibitively expensive for now. Best to focus ...
Dec 12, 2011 |
5 / 5 (7) |
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Fossil-fuel emissions unbraked by financial crisis
Emissions of carbon dioxide (CO2) from fossil fuels and the cement industry scaled a record high in 2010, rocketing by 5.9 percent over 2009 in a surge led by developing countries, scientists reported on Sunday.
Dec 05, 2011 |
5 / 5 (4) |
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SequesTech: A novel process to capture and mineralize flue gas carbon dioxide
(PhysOrg.com) -- A process that directly captures flue gas carbon dioxide from the combustion process and holds it has earned a patent for the University of Wyoming.
May 05, 2011 |
3.5 / 5 (4) |
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Bismuth for bone cement: Water-soluble cluster key to the formation of hybrid material
(PhysOrg.com) -- Organic–inorganic hybrid materials, uniting the advantages of their organic and inorganic parts, are used for a wide variety of applications. However, making a homogeneous composite material ...
Oct 28, 2010 |
3 / 5 (1) |
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The Achilles' heel of tendons
Tendons are the body's marionette strings, connecting bones to muscles that raise an eyebrow or propel us into a full run. That is, until an unusually forceful or awkward pull on the strings leaves us with a sprain, strain ...
Sep 21, 2010 |
4.8 / 5 (4) |
3
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BP says cap catching some 10,000 barrels a day
Engineers searched for ways to capture more oil flowing from a ruptured well in the Gulf of Mexico Sunday after energy giant BP said a cap was currently catching around 10,000 barrels a day.
Jun 06, 2010 |
2 / 5 (6) |
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Attempt at 'top kill' method to clog oil leak delayed
A make-or-break attempt to clog a ruptured pipe gushing oil into the Gulf of Mexico with a method dubbed the "top kill" has been delayed until at least Tuesday, officials said Friday.
May 22, 2010 |
4 / 5 (2) |
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Open Lid Reveals Mercury
(PhysOrg.com) -- Mercury, the silvery liquid formerly used in thermometers, is now known to be highly toxic. The worst of the toxins are organic mercury compounds, such as methylmercury. Most previous analytical procedures ...
Chemistry / Analytical Chemistry
Oct 15, 2009 |
4.4 / 5 (8) |
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Green Ideas: Making Concrete from Rice
(PhysOrg.com) -- Concrete accounts for about 5% of all human-related CO2 emissions. The fact that we use so much cement in building could mean that the issue becomes even more pronounced in the future. Bu ...
Jul 21, 2009 |
3.2 / 5 (14) |
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Engineers developing bullet proof vests from cement
Engineers at the University of Leeds are working on a new type of body armour made from cement.
Jun 29, 2009 |
3.3 / 5 (7) |
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Cement
In the most general sense of the word, a cement is a binder, a substance which sets and hardens independently, and can bind other materials together. The word "cement" traces to the Romans, who used the term "opus caementicium" to describe masonry which resembled concrete and was made from crushed rock with burnt lime as binder. The volcanic ash and pulverized brick additives which were added to the burnt lime to obtain a hydraulic binder were later referred to as cementum, cimentum, cäment and cement. Cements used in construction are characterized as hydraulic or non-hydraulic.
The most important use of cement is the production of mortar and concrete - the bonding of natural or artificial aggregates to form a strong building material which is durable in the face of normal environmental effects.
Cement should not be confused with concrete because the term cement explicitly refers to the dry powder substance. Upon the addition of water and/or additives the cement mixture is referred to as concrete, especially if aggregates have been added.
For more information about Cement, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
