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Topic: Cement


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  Cement - Wikipedia, the free encyclopedia
mortar is primarily comprised of cement, lime, and sand.
Portland cement is made primarily from limestone, certain clay minerals, and gypsum, in a process which drives off carbonates and chemically alters the composition of the primary ingredients.
Portland cement was patented in England by Joseph Aspdin in 1824.
en.wikipedia.org /wiki/Cement   (325 words)

  
 Soil cement - Wikipedia, the free encyclopedia
Soil cement is a construction material, a mix of pulverized natural soil with small amount of portland cement and water, usually processed in a tumble, compacted to high density.
Soil cement is frequently used as a construction material for pipe bedding, slope protection, and road construction as a subbase layer reinforcing and protecting the subgrade.
While in portland cements the paste coats all aggregate particles and binds them together, in soil cements the amount of cement is lower and therefore there are voids left and the result is a cement matrix with nodules of uncemented material.
en.wikipedia.org /wiki/Soil_cement   (374 words)

  
 Oilfield Glossary: Term 'cement'
Cement is also used to seal formations to prevent loss of drilling fluid and for operations ranging from setting kick-off plugs to plugging and abandonment.
Cement sets as the water in the slurry reacts chemically with the active ingredients, the most significant of which is tricalcium silicate reacting to create calcium silicate hydrate.
Cement additives are used to control the setting process of the cement slurry and enhance the performance of the set cement.
www.glossary.oilfield.slb.com /Display.cfm?Term=cement   (355 words)

  
 Cement
The basic characteristic of cement is that after it has been mixed with water, it will set hard as rock, and will bind together any rock or mineral fragments mixed into it.
Cement was patented by John Aspdin in 1824 as Portland cement because he though it looked rather like limestone from Portland, which was used a lot in buildings.
Cement and sand can also be used to produce a thin skin or render, to protect the outside of the buildings.
www.es.ucl.ac.uk /schools/UCL/cement.htm   (562 words)

  
 Cement Association of Canada - Blended Hydraulic Cements
Blended cements are used in all aspects of concrete construction in the same manner as portland cements.
Blended cements can be used as the only cementing material in concrete or they can be used in combination with other supplementary cementing materials added at the concrete plant.
Blended hydraulic cement as defined by CSA A362 is a product consisting of a mixture of portland cement and one or more of granulated blast-furnace slag, fly ash, or silica fume to which no processing additions have been made except as permitted and noted in Clause 3.2 of the Standard.
www.cement.ca /cement.nsf/0/0832D7018F613F82852568AA005CB185?OpenDocument   (599 words)

  
 USATODAY.com - Cement weighs on construction   (Site not responding. Last check: 2007-10-21)
In fact, a recent survey of purchasing managers found cement and concrete, which is made with cement, were in short supply in July for the third consecutive month, according to the Institute for Supply Management.
Cement is the key ingredient in concrete, the liquid substance seen oozing out of trucks' rotating, cylindrical mixers.
The Portland Cement Association, a trade group representing cement companies in the USA and Canada, estimates U.S. cement demand was up 9.5% during the first five months of 2004 compared with the same period in 2003.
www.usatoday.com /money/industries/manufacturing/2004-08-08-cement_x.htm   (1329 words)

  
 Grasim : FAQs   (Site not responding. Last check: 2007-10-21)
Cement is a powder, which by hydraulic reaction (i.e.
Cement is a finely ground powder composed mainly of limestone and silica that react with water to harden.
Concrete is a blend of cement powder, sand, gravel, water and sometimes chemicals, which are mixed together and placed in forms for construction purposes.
www.themanagementor.com /cornerstone/faqs/faq1.asp   (415 words)

  
 CSE: Cement Rating Project
The fact is that the Indian cement industry spends as little as 4 per cent of its turnover on the cost of its raw material – limestone.
In industrial sectors, cement industry is the second largest emitter of carbon dioxide and accounts for 5 per cent of global human-made carbon dioxide emissions.
The cement sector holds immense promise in terms of utilising wastes from other industries: fly ash (from the power sector) and blast furnace slag (from the iron and steel industry) are both used to manufacture blended cement, without sacrificing the quality of cement.
www.cseindia.org /programme/industry/press_20051216.htm   (1258 words)

  
 Cement Substitutes - Details   (Site not responding. Last check: 2007-10-21)
Cement substitutes should be distinguished from concrete additives, such as plasticizers and air entrainment agents; and from aggregate substitutes, such as ground glass or ground scrap rubber.
ASTM C595-02a "Standard Specification for Blended Hydraulic Cements" is the specification covering five classes of blended hydraulic cements for both general and special applications, using slag or pozzolan, or both, with portland cement, or portland cement clinker or slag with lime.
Cement substitutes should be added to the concrete along with portland cement, rather than added to the raw materials (to avoid the energy loss in reheating the substitute during cement production).
www.toolbase.org /tertiaryT.asp?TrackID=&CategoryID=1402&DocumentID=2062   (1818 words)

  
 Cement industry overview   (Site not responding. Last check: 2007-10-21)
Portland cement, the basic ingredient in concrete, was first produced and patented in 1824 by a British stonemason.
A recent report* concludes that global cement consumption rose an average 2.75% in the period 2000-2002 and at the end of 2002 there were an estimated 1447 integrated production facilities and a further 250 separate grinding installations world-wide.
The mixture of raw materials is fed into the upper end of a rotating, cylindrical kiln, which achieves temperatures in excess of 1000°C. It passes through at a rate controlled by the slope and rotational speed of the kiln.
www.malvern.co.uk /ProcessEng/industries/cement/overview.htm   (557 words)

  
 Cement mixer: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-21)
A cement mixer is a device that combines cement cement quick summary:
In construction, concrete is a composite building material made from the combination of aggregate and cement matrixbinder....
A typical cement mixer uses a revolving drum to mix the components.
www.absoluteastronomy.com /encyclopedia/c/ce/cement_mixer.htm   (769 words)

  
 Bamburi Cement : glossary
N refers to cement with normal early day strengths while R refers to rapid hardening cements i.e.
Portland Cement - Name originated from the resemblance of the color and quality of the hardened cement to Portland stone, limestone quarried in Dorset (In England).
The term is now a generic name for cement worldwide and describes cement made from mixing calcareous or argillaceous, or other materials with silica, alumina, and iron oxide, burning them at a melting temperature of 14500C to produce clinker
www.bamburicement.com /glossary.asp   (357 words)

  
 cement   (Site not responding. Last check: 2007-10-21)
A few years later, an alternative to antibiotic impregnated cement was developed – antibiotic impregnated beads which are used to temporarily fill in the dead space created after the debridement of infected bone.
Antibiotics used in cements or beads must be active against specific pathogens, be available as powders, and stable to heat generated during the polymerization reaction.
Other issues to consider are the stability of a chosen antibiotic at body temperature, water solubility to permit the diffusion of the antibiotic from the cement, biphasic release of antibiotic (high elution in the first hours to days post surgery and the remaining persisting up to years) and the patient’s allergies.
www.uic.edu /pharmacy/services/di/cement.htm   (722 words)

  
 Reference.com/Encyclopedia/Cement
In the general sense, a cement (Latin caementum) is any material with adhesive properties.
The clinker nodules are then ground with about 3 % gypsum to produce cement with a fineness typically of less than 90 micrometres.
Additionally, CEMENT is an acronym for Computer Enhanced Multiple Exposure Numerical Technique in which multiple pictures of the same subject matter are "cemented" together to attain increased picture resolution or for artistic visual lightspaces.
www.reference.com /browse/wiki/Cement   (314 words)

  
 Profile Cement
APROMATCO Main Fields of Activity: Portland cement, aluminous cement ("cement fondu"), slag cement, supersulphate cement and similar hydraulic cements.
Main Fields of Activity: Portland cement, aluminous cement ("cement fondu"), slag cement, supersulphate cement and similar hydraulic cements.
Special cement, coloured cement ~ portland cement, aluminous cement ("ciment fondu"), slag cement, supersulphate cement and similar hydraulic cements, whether or not coloured or in the form of clinkers.
bizinforom.com /profile_cement.htm   (326 words)

  
 The History of Concrete: Textual
Natural cement is limestone that naturally has the appropriate amounts of clay to make the same type of concrete as John Smeaton discovered.
Joseph Aspdin of England invented portland cement by burning finely ground chalk with finely divided clay in a lime kiln until carbon dioxide was driven off.
Isaac Johnson claims to have burned the raw materials of portland cement to clinkering temperatures.
matse1.mse.uiuc.edu /~tw/concrete/hist.html   (949 words)

  
 Cement-Ind'l Goods / Svs-News By Industry -The Economic Times   (Site not responding. Last check: 2007-10-21)
Kanpur-based J K Cement Ltd is planning to invest about Rs 1,200 crore in the next 3-5 years.
Cement sales continued to remain strong in May, driven by strong pre-monsoon demand, as high prices in some parts of the country failed to deter buyers.
Madras Cements Ltd said on Monday its board approved setting up a new 2 million tonnes per year cement plant at a cost of Rs 6.13 billion in Tamil Nadu.
economictimes.indiatimes.com /articlelist/13357906.cms   (365 words)

  
 The Birth of the Slag Cement Association
Because of the rapid growth of the U.S. slag cement industry, the Slag Cement Association (SGA) was formed in 2001 to help educate engineers, specifiers, contractors, and producers in the proper use of slag cement.
Slag cement is produced in a tightly controlled process that ensures consistent chemical and physical properties.
Earliest documented use of slag cement was in 1774, as a mortar in combination with slaked lime.
cementamericas.com /mag/cement_birth_slag_cement   (2156 words)

  
 WHAT'S THAT STUFF? - Cement
"Chemical compositions vary from cement to cement according to the kiln conditions and the detailed composition of the local ingredients with which the kiln is fed," he replied.
The properties of cement can vary "in an alarming manner" from manufacturer to manufacturer and even from batch to batch from any single producer, he pointed out.
He added that even a small variation in the chemical composition or physical state of cement can cause substantial variations in performance, usually in ways that cannot be foreseen at all.
pubs.acs.org /cen/whatstuff/stuff/7635cement.html   (746 words)

  
 HeidelbergCement - Cement   (Site not responding. Last check: 2007-10-21)
The word “cement” is based on the Latin word “caementum” (=rubblestone).
The binder that is used in the production of concrete and mortar has the ability to harden even in water.
Different applications require the use of various types of cement with a specific composition.
www.heidelbergcement.com /html/e/page.asp?pageID=15   (92 words)

  
 Sector Projects - Cement (WBCSD)
Most of Europe set to miss Kyoto goals: study AFP, 27 December 2005 - Most of Europe, which has criticized the United States over its stance on global warming, looks set to miss a set of goals to cut greenhouse gases under the Kyoto Protocol, a study revealed on Tuesday.
The cement industry plays a key role in meeting society's needs for housing and basic infrastructure by supplying concrete.
Cement production is energy-intensive - it accounts for 5 percent of global carbon dioxide emissions - and it touches on a wide range of sustainability issues including:
www.wbcsd.org /includes/getTarget.asp?type=p&id=NzY&doOpen=1&ClickMenu=LeftMenu   (345 words)

  
 Why the Cement Industry?   (Site not responding. Last check: 2007-10-21)
The portland cement industry in the United States and Canada consists of more than 120 cement production facilities, as well as many offices and manufacturing plants that supply equipment and materials to those production facilities.
Cement manufacturing is based on appreciation of details, relationships, and technical know-how.
CEMENT 101, Version 2.0 is your look at one of the most exciting and important industries in North America.
cementamericas.com /mag/cement_why_cement_industry   (197 words)

  
 Cement
TXI IP cement is an all-purpose cement for use in general concrete construction and meets ASTM C 595 specifications.
It is an uniform blend of portland cement and a pozzolan.
TXI Masonry Cement Type N is manufactured specially to meet the needs of the brick, block, and stone mason in the field.
www.txi.com /products/package_products/cement/cement.html   (714 words)

  
 Cement
TXI is now the largest producer of cement in Texas and a major producer in California.
Oro Grande Cement Plant in Oro Grande, California was presented with a Safety Commendation Award for working more than one year with no lost time accidents and a Safety Merit Award for working more than 500,000 man-hours with no lost time accidents.
A fine grind, low-density cement that may be mixed over a range of 12.0 to 14.2 pounds per gallon and has a typical blaine surface area of 6,900 square centimeters per gram
www.cement.com   (884 words)

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