Shear strength of recycled aggregate concrete is lesser than of normal concrete. This is because the recycled aggregate from field-demolished concrete for example can be relatively weaker than a typical natural aggregate. In general there is a 10% decrease in strength when recycled coarse aggregates are used. Uses of Crushed Concrete Aggregates
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Only up to 10 to 20 percent fine RCA is beneficial. The aggregate should be tested at several substitution rates to determine the optimal rate. Often recycled aggregate is combined with virgin aggregate when used in new concrete. An example of a mix design using recycled aggregates in a pavement application is shown following table.
Recycled Concrete Aggregate Cost: Recycled Concrete Aggregate cost in the USA is around $15 to $ 55 per ton around $18 to $80 per cubic yard and $2 to $5 per cubic foot with price depends on the quality and quantity of recycled aggregate.
4) The optimum percentage replacement of recycled aggregate is 40%. 5) Due to use of recycled geopolymer aggregate in concrete the 20% cost saving in the Geopolymer concrete were evaluated.The cost saving observed in geopolymer concrete with 40% replacement of Recycled aggregate use in geopolymer concrete.(Bagragi et al. 1990).
Such a distinction is necessary because the composition of recycled aggregate and its grading have a great effect on recycled concrete properties. A number of standards exist to regulate the use of recycled aggregates in concrete such as EN 12620 (2008) and EN 206 (2016).
The Cost Difference Between New Aggregate Vs. Aggregate Made from Recycled Concrete. One of the key benefits of using aggregate made from recycled concrete is the lowered cost compared to using newly created aggregate. Producing recycled aggregate does not require the mining of the new materials required to produce aggregate from scratch.
Classification & properties of recycle aggregate concrete Material composition is the basis for classification of recycled concrete aggregate in two main types- 1) Crushed concrete 2) Mixed material Each of these types is divided in a class for bound and a class for unbound use Crushin g age Bulk specific gravity Bulk density Absorp tion .
Reduced material costs – Recycled Concrete has a higher yield than virgin aggregates weighing 10-15% less. Diverts material from landfill and eliminates tipping fees. A pioneer and leader in the Alberta recycling market Fish Creek has a fleet of three Hazemag horizontal shaft impactors for mobile crushing throughout the province of Alberta .
With the cost of quarried aggregates rising and the standard of recycled products improving recycled aggregates are becoming a favourable and convenient alternative. Previously leftover aggregate would have been sent to landfill - but reusing it is now regarded as highly beneficial for a number of reasons.
University recycled concrete aggregates (RCA) can reduce costs environmental impacts and project delivery time when used in concrete pavements (Garber et al. 2011). A WSDOT report adds that dwindling supplies of high-quality natural aggregate increasingly limited landfill
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Recycled aggregates are produced from recycled materials which include recycled concrete brick and masonry. Can be a single sized material typically 20 mm 14 mm 10 mm or 7 mm; Fine Aggregate is aggregate less than 5 mm. Coarse Aggregate is normally greater than 5 mm.