News tagged with cement
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 |
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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 |
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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 |
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Carbon mitigation strategy uses wood for buildings first, bioenergy second
Proposals to remove the carbon dioxide caused by burning fossil fuel from the atmosphere include letting commercially managed forests grow longer between harvests or not cutting them at all.
Nov 22, 2011 |
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Chevron Brazil says it will seal errant oil well
US energy giant Chevron said Tuesday it would seal and abandon an errant oil well which for the past week has seeped oil into waters off Brazil's Rio de Janeiro state.
Nov 15, 2011 |
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A 'carbonizing dragon': Construction drives China's growing CO2 emissions
Constructing buildings, power-plants and roads has driven a substantial increase in China's CO2 emission growth, according to a new study involving the University of East Anglia (UEA).
Oct 05, 2011 |
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Paving the way to greenhouse gas reductions
Concrete is one of the most extensively used materials worldwide -- on average, more than two tons per year of the rock-like stuff is produced for every man, woman and child on Earth, making its use second only to water. ...
Aug 29, 2011 |
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IOF urges systematic osteoporosis management after vertebral fracture augmentation
A working group of the International Osteoporosis Foundation (IOF) has issued a literature review of prospective controlled studies comparing the efficacy and safety of two minimally invasive techniques for vertebral augmentation ...
Aug 01, 2011 |
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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 |
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Software improves cement quality
New control software predicts how cement mills will operate and continually optimizes the milling process. The results are improved cement quality and increased mill throughput. The software Sicement IT MCO ...
Mar 01, 2011 |
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BP could have prevented blowout: investigator
BP's oil well in the Gulf of Mexico might never have blown last year if the company's engineers had been consulted about a key test that pointed to a defective cement job, investigators reported Thursday.
Feb 17, 2011 |
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'Pollution' may be key ingredient in concrete mixtures, researcher says
(PhysOrg.com) -- A researcher at Missouri University of Science and Technology is leading a study to increase the amount of fly ash used in concrete. If successful, the effort could divert millions of tons of the waste product ...
Jan 27, 2011 |
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In the lab, engineer's novel liquid provides a solid fix for broken bones
A bone-healing fluid that can be injected into breaks with a syringe shows such strong promise in lab testing, that it has been licensed from Brown by a Massachusetts biotech startup for further development.
Dec 07, 2010 |
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BP did not put profit before safety on Gulf well: probe
A US presidential panel probing the Gulf of Mexico oil disaster examined Tuesday the oil industry's safety culture, after its lead investigator said he found no evidence BP and its partners had sacrificed ...
Nov 09, 2010 |
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BP, Halliburton 'knew' oil disaster cement was unstable
BP and Halliburton knew weeks before an explosion tore through a BP rig in the Gulf of Mexico that the cement mix they planned to pump into an undersea BP well was faulty, a probe found.
Oct 29, 2010 |
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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.
