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GREEN CONCRETE

By Civilthinges.com

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What is Green Concrete?

  • A concrete that uses less energy in its production & produces less carbon dioxide than normal concrete is green concrete.
  • Green Concrete is taken to mean environment-friendly concrete.

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Why Green Concrete?

  • The main ingredient in concrete is cement and it consists of Limestone (Calcium Carbonate CaCO3).
  • During manufacture of cement, its ingredients are heated to about 800 - 10000C.
  • During this process the Carbon Dioxide is driven off.
  • Approximately 1kg of cement releases about 900gms of Carbon Dioxide into the atmosphere.
  • Therefore, green concrete came into existence to reduce the emission of carbon dioxide.

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Materials for Green Concrete

  • Locally available: Construction materials, components, and systems found locally or regionally, saving energy and resources in transportation to the project site.
  • Salvaged, re-furnished, or re-manufactured: Includes saving a material from disposal and renovating, repairing, restoring, or generally improving the appearance, performance, quality, functionality, or value of a product.
  • Reusable or recyclable: Select materials that can be easily dismantled and reused or recycled at the end of their useful life.

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Materials for Green Concrete

  • Recycled Demolition Waste Aggregate
  • Recycled Concrete Aggregate
  • Blast furnace Slag
  • Manufactured Sand
  • Glass Aggregate
  • Fly ash

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Mix Design

  • Optimizes void space between aggregates by optimizing particle proportions and packing of materials. This makes more effective use of the cement binder.
  • Aggregates replace excess cement paste to give improved stability, less shrinkage and increase in strength & durability.
  • Less cement also generates less heat of hydration.

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Mix Design

  • The slump of the concrete and its flow are a function of the shape & the quantity of the predominant size of the aggregate in the mix.
  • Use of more fine aggregate gives higher slump & flow. So the optimum proportions of coarse & fine aggregate must be critically found to have the best and dense concrete in both fresh & hardened stage of concrete.

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Mix Design

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Improved Properties

  • Mix can result in a reduced paste volume within the concrete structure resulting in a higher level of protection against concrete deterioration.
  • Higher strength per kilogram of cement
  • Increased durability & lower permeability
  • More aggregates typically mean higher Modulus of elasticity.

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Advantages

  • User-friendly
  • Optimized mix designs mean easier handling, better consistency and easier finishing
  • Reduction in shrinkage & creep
  • Green Concrete uses local and recycled materials in concrete.
  • The heat of hydration of green concrete is significantly lower than traditional concrete
  • This result in a lower temperature rise in large concrete pours which is a distinct advantage for green concrete.

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Thank You!!!

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