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Researchers turn cement into metal

(Phys.org) —In a move that would make the Alchemists of King Arthur's time green with envy, scientists have unraveled the formula for turning liquid cement into liquid metal. This makes cement a semi-conductor and opens ...

Electrifying cement with nanocarbon black

Since its invention several millennia ago, concrete has become instrumental to the advancement of civilization, finding use in countless construction applications—from bridges to buildings. And yet, despite centuries of ...

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 to water.

Looking to light highways with light-emitting cement

In order to light roads, highways or bicycle lanes without electricity, Ph.D. José Carlos Rubio, from Michoacan's University of San Nicolas Hidalgo, UMSNH in Spanish, created a light-emitting cement that has a lifespan of ...

Spheres can make concrete leaner, greener

Rice University scientists have developed micron-sized calcium silicate spheres that could lead to stronger and greener concrete, the world's most-used synthetic material.

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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.

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