Cement
hideIn 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.
News tagged with cement
Hybrid composite for root canal treatment
Nov 03, 2009 |
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(PhysOrg.com) -- A dentist carrying out root canal treatment will need to use a variety of compounds. These do not always bond together properly and sometimes expensive follow-up treatment has to be performed. ...
Open Lid Reveals Mercury
Chemistry / Analytical Chemistry
Oct 15, 2009 |
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(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 ...
Cement's basic molecular structure finally decoded
Nanotechnology / Nanomaterials
Sep 09, 2009 |
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(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 ...
Study results raise questions about vertebroplasty for osteoporotic spinal compression fractures
Aug 05, 2009 |
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A new study led by Mayo Clinic researchers has found that relief of pain from vertebral compression fractures, as well as improvement in pain-related dysfunction, were similar in patients treated with vertebroplasty and those ...
Green Ideas: Making Concrete from Rice
Jul 21, 2009 |
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(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 ...
Engineers developing bullet proof vests from cement
Jun 29, 2009 |
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Engineers at the University of Leeds are working on a new type of body armour made from cement.
Waste water treatment plant mud used as 'green' fuel
Jun 23, 2009 |
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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 ...
Company illegally tested bone cement on people, indictment says
Jun 17, 2009 |
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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.
Secret of sandcastle construction could help revive ancient building technique, researchers say
Jun 02, 2009 |
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The secret of a successful sandcastle could aid the revival of an ancient eco-friendly building technique, according to research led by Durham University.
Cementless hip implants are durable for at least 20 years
May 01, 2009 |
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Despite the common perception that total hip replacements last about 10 years, researchers at Rush University Medical Center have found that the devices are extremely durable, even 20 years after surgery.
EPA to limit mercury from cement plants
Apr 22, 2009 |
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The Environmental Protection Agency on Tuesday called for the nation's first limits on mercury emissions from the more than 100 cement factories across the U.S.
Self-healing concrete for safer, more durable infrastructure (w/Video)
Apr 22, 2009 |
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(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.
A dirty job but ...
Apr 13, 2009 |
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Byproducts from the electronics, fuel, chemical and defense industries can be far from benign. Toxic heavy metals like cadmium and lead can seep into our food chain and cause cancer. And if found in the soil, these dangerous ...
Cementless cup device developed for hip replacements shows durability after more than 20 years
Feb 02, 2009 |
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When a first hip replacement fails, patients may be concerned that their options for a durable hip replacement are limited and that the prognosis is poor. However, a research study to be published in the February issue of ...
New twist on old medical technology may prevent amputations
Jan 27, 2009 |
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Old technologies, bone cement and a well known antibiotic, may effectively fight an emerging infection in soldiers with compound bone fractures, according to a study published online today in the Journal of Orthopedic Re ...
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