A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource.Cements used in construction are usually inorganic, often lime or calcium silicate based, which can be characterized as non-hydraulic or hydraulic respectively, depending on the ability of the cement to set in the presence of water (see hydraulic and non-hydraulic lime plaster).
Non-hydraulic cement does not set in wet conditions or under water. Rather, it sets as it dries and reacts with carbon dioxide in the air. It is resistant to attack by chemicals after setting.
Hydraulic cements (e.g., Portland cement) set and become adhesive due to a chemical reaction between the dry ingredients and water. The chemical reaction results in mineral hydrates that are not very water-soluble and so are quite durable in water and safe from chemical attack. This allows setting in wet conditions or under water and further protects the hardened material from chemical attack. The chemical process for hydraulic cement was found by ancient Romans who used volcanic ash (pozzolana) with added lime (calcium oxide).
The word "cement" can be traced back to the Ancient Roman term opus caementicium, used to describe masonry resembling modern concrete that was made from crushed rock with burnt lime as binder. The volcanic ash and pulverized brick supplements that were added to the burnt lime, to obtain a hydraulic binder, were later referred to as cementum, cimentum, cäment, and cement. In modern times, organic polymers are sometimes used as cements in concrete.
World production is about four billion tonnes per year, of which about half is made in China. If the cement industry were a country, it would be the third largest carbon dioxide emitter in the world with up to 2.8 billion tonnes, surpassed only by China and the United States. The initial calcination reaction in the production of cement is responsible for about 4% of global CO2 emissions. The overall process is responsible for about 8% of global CO2 emissions, as the cement kiln in which the reaction occurs is typically fired by coal or petroleum coke due to the luminous flame required to heat the kiln by radiant heat transfer. As a result, the production of cement is a major contributor to climate change.
Position: Chemist (WTP)
Department: Power Plant
Reports To: WTP In charge
Education Degree: Bachelor of Science in Chemistry
Experience: Fresher/ 1 years of experience
Essential Skills Required
Knowledge based in chemicals especially Chemistry.
Excellent computational knowledge...
Position: Mechanical Supervisor
Requirements
8 years in mechanical repair and maintenance, with 1+ year in supervision.
Proficient in SAP,MS Office, and computer skills.
Must have Experience in maintenance supervision in the cement or equivalent industry.
Strong troubleshooting skills...
Habarini wadau. Nauza cement grade 42.5 kampuni ya Camel kwa bei ya 15,000 kwa mfuko. Eneo ni Tabata Saanene. Bei ni nafuu kwa kuwa ninafunga biashara.
Imebaki mifuko 200 tu. Wahini sasa. Risiti ya EFD ipo.
Kwa mawasiliano zaidi, piga namba 0687320462.
Position: DCS Engineer
Department: Power Plant
Reports To: Shift in Charger. Education
Main Objectives
Operation of power plant from panel desk through DCS
Skills and Responsibility
Able to work in rotational shift (Day & Night)
Have to work from panel desk at CCR thru DCS for operation of...
Habari zenu wadau?
Nilikuwa kwenye process za ujenzi ila kwa bahati mbaya huu mwaka sijauanza vizuri na kiukweli sioni dalili za kuendelea na ujenzi hivi karibuni naona nikiendelea kukaa na hizi cement kwa muda mrefu zaidi kuna uwezekano zikaganda nimeamua kuziuza ili nipunguze/niziuze hasara...
Position: Kiln Planner
Areas of Responsibility: As Assigned by the supervisor
Reports To: MCC MANAGER
Specific Knowledge: Preferably 5 years’ experience in kiln operations; experience in cement industry is an added advantage.
The Management of Tanzania Portland Cement Public Limited Company is...
Serikali imeingia makubaliano na wawekezaji wa kiwanda cha Mbeya Cement ya kuboresha na kuongeza ufanisi wa uzalishaji wa kiwanda hicho ikiwa ni Pamoja na kufutwa kwa Deni la Shilingi Billion 170 ili kukiwezesha kiwanda hicho kutengeneza Faida.
Serikali inamiliki asilimia 35 ya hisa katika...
Mahakama Kuu imewaamuru ndugu wawili na wakurugenzi wa Kampuni ya Saruji ya Dar es Salaam Cement Co. Limited kumlipa mwenyekiti wao na Mkurugenzi Mtendaji, Pardeep Hans, zaidi ya Tsh. Bilioni 10 kwa kumfukuza katika kampuni hiyo kinyume cha sheria na kuiuza kwa Kampuni ya Amsons Industries (T)...
Kampuni ya Dangote imetangaza kupanda kwa bei ya cement kwa shillingi 885 kwa wauzaji wa jumla.Na 2000 kwa wauzaji wa rejareja Na sababu ni kuadimika kwa dola ya marekani.Kwa mwaka huu cement ilipanda julai mosi kwa ongezeko la shilingi 2000 baada ya serikali kuongeza kodi katika bajeti ya...
Ety wakuu,, hivi ratio nzuri kati ya Cement mfuko mmoja(Kg 50) na mchanga ni kiasi gani kwa matumizi ya kuchapia nyumba(Plaster). Maana nataka ukuta ulio imara zaidi hata msumari husiingie..
Hawa mafundi wa Mtaani wengi ni Ovyoovyo..
Habari wana jamvi,
Kama heading inavyojieleza hizi nguzo za TANESCO ambazo zimetengewa kwa cement uimara wake ni mdogo na ni hatarishi hasa maeneo ya makazi na yenye watu wengi.
Awali nilijua labda zinatengenezwa ndani zinawekwa nondo na seng'enge ili kuongeza uimara kumbe ni tofauti ,hii ni...
Embu twambie huko kwenu inauzwaje?
Niko hapa Dar. Cement ni kati ya 16,500 n 18,000.
Mishahara iko palepale.
Tunauliza; Tutajenga kweli?. Naambiwa kuna TOZO ya Serikali haijaanza kutozwa - Sijui ni ipi hiyo.
HATIMAYE Jaji Mstaafu Thomas Mihayo ameamua kuvunja ukimya kwa kueleza kuwa wanasheria waliipotosha Serikali na Mawaziri kuhusu kuendelea na mchakato wa kampuni ya Saruji ya Twiga kununua hisa za Tanga Cement wakati mahakama ilizuia kuwapo kwa muunganiko wa kampuni hizo.
Pia amesema tayari...
Wakuu hisa za Tanga cement zimerise for almost 50% ndani ya wiki mbili tu. Kama mjuavyo hii mostly imechangiwa kwa kampuni hii kuuzwa kwa Twiga cement company PLC hivyo future prospectus itakuwa njema zaidi.
Kama una mpunga tupia Tanga cement PLC hutojuta.
Asante
For some time now I have been following a company called Chalinze Cement and what I saw was funny. Did you know that this company does not own any land that can mine limestone for cement production? It also doesn't even have the branding they claim to have. They do not even import cement into...
SERIKALI IMETOA UFAFANUZI KUHUSU UNUNUZI WA TANGA CEMENT UNAOFANYWA NA TWIGA CEMENT
Serikali imetoa ufafanuzi kuhusu ununuzi wa hisa za Tanga Cement unaofanywa na Twiga Cement, kuwa umefuata taratibu za kisheria na kwamba kampuni inayopinga ununuzi huo ya Chalinze Cement imeshafutiwa usajili...
Mhe. Waziri WA Fedha Bila kujali kesi zilizowahi kufunguliwa na kuamuliwa kwenye mabaraza mbalimbali amegongelea msumari kuunganishwa Kwa Tanga cement na Twiga cement Kwa maelezo kwamba serikali inaziona dola milion Mia NNE siyo zakuacha hivihivi.
Nawakumbusha Tu maana mambo NI mengi uchaguzi...
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