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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, c?ment 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 as 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. 
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Articles

147 killed in Baghdad twin bombings

A pair of suicide car bombings Sunday devastated the heart of Iraq's capital, killing at least 147 people in the country's deadliest attack in more than two years.

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Beijing launches action plan to improve residents' health

Addressing the function, Fang Laiying, chief of the Beijing Municipal Health Department, said it was hoped to improve the health of locals comprehensively by the plan`s implementation, but lengthening life span was just one of 11 objectives.

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ARTICLES
147 killed in Baghdad twin bombings
A pair of suicide car bombings Sunday devastated the heart of Iraq's capital, killing at least 147 people in the country's deadliest attack in more than two years.
Beijing launches action plan to improve residents' health
Addressing the function, Fang Laiying, chief of the Beijing Municipal Health Department, said it was hoped to improve the health of locals comprehensively by the plan`s implementation, but lengthening life span was just one of 11 objectives.