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Questions and Answers
What is the strength difference between recycled aggregate concrete and concrete with fresh aggregate?
What is the strength difference between recycled aggregate concrete and concrete with fresh aggregate?
- 10-15% lower (correct)
- 10-15% higher
- No difference
- 5-10% lower
What is the main purpose of using recycled aggregates?
What is the main purpose of using recycled aggregates?
- To reduce the water requirement
- To increase the specific gravity
- To reduce the amount of cement used
- To create new aggregates (correct)
What is the most effective way to balance the strength difference between recycled aggregate concrete and concrete with fresh aggregate?
What is the most effective way to balance the strength difference between recycled aggregate concrete and concrete with fresh aggregate?
- Choosing a suitable mix design
- Increasing the amount of cement used
- Adding more water to the mix
- Using admixtures (correct)
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Study Notes
- Every year, millions of tonnes of concrete rubble are generated due to various reasons.
- This rubble can be used for new aggregates in plain concrete or R.C.C. works, with proper corrections in the mix design.
- The recycled aggregates have slightly less specific gravity and more absorption value.
- The strength of recycled aggregate concrete is about 10 to 15 percent less when compared to the concrete with fresh aggregate.
- This can be balanced by choosing a suitable mix design, higher quantity of cement or by using admixtures to reduce the water requirement.
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