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) |
22
|
Self-healing concrete for safer, more durable infrastructure (w/Video)
(PhysOrg.com) -- A concrete material developed at the University of Michigan can heal itself when it cracks. No human intervention is necessary--just water and carbon dioxide.
Apr 22, 2009 |
4.5 / 5 (18) |
3
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) |
5
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) |
2
|
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) |
7
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) |
18
|
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) |
1
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) |
63
|
Cement-like creation could help the environment
(PhysOrg.com) -- Civil and Environmental Engineering Assistant Professor Naji Khoury has created a permeable cement-like material that offers a host of environmental advantages over traditional paving.
Apr 20, 2010 |
4.1 / 5 (7) |
6
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 |
5 / 5 (5) |
3
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) |
2
Company illegally tested bone cement on people, indictment says
A Swiss company with major operations in West Chester, Pa., illegally tested its bone cement on about 200 people, three of whom died, according to a 52-count indictment issued Tuesday by the U.S. Attorney in Philadelphia.
Jun 17, 2009 |
4 / 5 (5) |
1
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) |
10
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
|
Waste water treatment plant mud used as 'green' fuel
Catalan scientists have shown that using mud from waste water treatment plants as a partial alternative fuel can enable cement factories to reduce their CO2 emissions and comply with the Kyoto Protocol, as well as ...
Jun 23, 2009 |
4.3 / 5 (4) |
1
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.
