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

    VOA: special.2009.12.01

  • And so, when you think about how much cement concrete are consumed annually on the planet, this becomes a considerable point source of greenhouse gas emissions.

    当你想到,在地球上每年要消耗多少的水泥混凝土的时候,这将是温室气体排放的,一个主要来源。

    麻省理工公开课 - 固态化学导论课程节选

  • with the cement and the statue and stuff, so it's a lot different.

    现在这里都是水泥钢筋建筑物、艺术雕塑,所有的这些,都跟之前不一样了。

    联合广场的变化 - SpeakingMax英语口语达人

  • As a final step there are plans to pump in mud and cement from below through relief wells.

    VOA: special.2010.08.07

  • But cement manufacturing produces around five percent of the carbon dioxide released by human activity worldwide.

    VOA: special.2009.12.01

  • I hurried to put the last stone into the wall and put the cement around it.

    VOA: special.2009.02.07

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

    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

  • Carbon dioxide is released in cement manufacturing when fuel is burned and limestone is heated.

    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

  • Other materials such as lime and cement can be added to strengthen the adobe.

    VOA: special.2009.01.12

  • Workers later added cement to harden in the well to seal it permanently.

    VOA: special.2010.08.07

  • Then,she started making statues out of cement material and glass.

    VOA: special.2010.04.14

  • The ancient Romans discovered that volcanic ash made better cement.

    VOA: special.2009.12.01

  • Although Israel bans cement to keep Hamas from building bunkers, streets are being repaired, and some public works projects are proceeding.

    VOA: standard.2010.06.16

  • "Now it's a lot more organized." Competitors tee off from cement tee pads, working their way along a beautiful disc course that winds around cornfields, wind turbines,and a football field.

    VOA: standard.2010.08.03

  • they mix cement; they carry buckets; they clean up.

    VOA: standard.2010.02.24

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