Concrete

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  • VIDEO: Concrete Balls To Deter 'Train Surfers'

    bbc.co.uk 4 weeks ago

    Railway staff have begun hanging concrete balls above train tracks in Indonesia to try to stop commuters from riding for free on carriage roofs.

  • Indonesia Deploying Concrete Balls To Deter Train Surfers

    nydailynews.com 4 weeks ago

    Indonesia has gone to imaginative extremes to try to stop commuters from illegally riding the roofs of trains , hosing down the scofflaws with red paint, threatening them with dogs and appealing for help from religious leaders.

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Videos

  • China's Xi vows to improve human rights

    China's Xi vows to improve human rights

  • Motorcycle rider killed in crash

    Motorcycle rider killed in crash

  • Copper wire thieves targeting local street lights.

    Copper wire thieves targeting local street lights.

  • Bus Damaged After Concrete Falls From Bridge

    Bus Damaged After Concrete Falls From Bridge

  • Work on rail pillars to begin soon

    Work on rail pillars to begin soon

  • Person killed in concrete truck vs car collision

    Person killed in concrete truck vs car collision

  • Earthquake Hits Central Philippines, Spurs Tsunami Warning

    Earthquake Hits Central Philippines, Spurs Tsunami Warning

  • Egypt's Ruling Generals Face Mounting Pressure

    Egypt's Ruling Generals Face Mounting Pressure

Additional Info

via Wikipedia
Concrete is a composite construction material composed primarily of aggregate, cement and water. There are many formulations that have varied properties. The aggregate is generally a coarse gravel or crushed rocks such as limestone, or granite, along with a fine aggregate such as sand. The cement, commonly Portland cement, and other cementitious materials such as fly ash and slag cement, serve as a binder for the aggregate. Various chemical admixtures are also added to achieve varied properties. Water is then mixed with this dry composite which enables it to be shaped and then solidified and hardened into rock-hard strength through a chemical process known as hydration. The water reacts with the cement which bonds the other components together, eventually creating a robust stone-like material. Concrete has relatively high compressive strength, but much lower tensile strength. For this reason is usually reinforced with materials that are strong in tension. Concrete can be damaged by many processes, such as the freezing of trapped water.

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