Men in two special factories worked day and night to make the concrete building material for the dam.

VOA: special.2009.08.12

Workers also used more than twenty million kilograms of steel to strengthen the concrete in the dam.

VOA: special.2009.08.12

Kahn was able to make the concrete material of the building look both solid and airy.

VOA: special.2009.12.13

Rajan Vempati thinks rice hull ash could help the concrete industry produce less carbon dioxide.

VOA: special.2009.12.01

There is literally concrete evidence of their work." Tony Hawk says skateboarding was once a sport on the edge of society.

VOA: special.2009.09.11

The National Ready Mixed Concrete Association points out that using ash in cement is not a new idea.

VOA: special.2009.12.01

The Portland Cement Association says the gas from the limestone is reabsorbed as concrete ages.

VOA: special.2009.12.01

Portland cement is a material that holds together the sand and crushed stone in concrete.

VOA: special.2009.12.01

The idea is to replace some of the portland cement traditionally used in making concrete.

VOA: special.2009.12.01

On June sixth,nineteen thirty-three, workers poured the first load of a building material called concrete.

VOA: special.2009.08.12

Rock walls made of wood or concrete have places for the climber's hands and feet.

VOA: special.2009.12.09

A concrete bridge was built about two hundred seventy-five meters above the Colorado River.

VOA: special.2010.10.27

They had used almost four million cubic meters of concrete in the dam.

VOA: special.2009.08.12

It is the largest single-span concrete arch bridge in the Western Hemisphere.

VOA: special.2010.10.27

You have probably heard the term "concrete jungle."

VOA: special.2011.04.29

Is it going to be reinforced concrete? And then you get into all kinds of things in terms of the designs of the columns and the beams and the framing of the building and the connections.

VOA: special.2011.03.28

One concrete outcome of the Conference will be to formalize, to institutionalize it so that users can rely on that information.

VOA: standard.2009.08.31