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  • Benjamin Lee——Works at the International Organization for Migration, Lives in Geneva, Switzerland.

    Sand and Gravel in Concrete. ... There will be four basic materials you need in your mix: Portland cement, sand, aggregate and water. Adding water will form a paste that will bind the materials together until the mix hardens. The strength of the concrete is inversely proportional to the water/cement ratio.Jan 30, 2014read more >>
    +119962023-06-24 12:39:56

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