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USE OF RCA for construction
CIVIL ENGINEERING
DEPARTMENT
ADITYA RANJAN PATRA
(TRANSPORTATION ENGINEERING)
CONTENTS:
• INTRODUCTION
• WHAT IS RECYCLED CONCRETE AGGREGATE
• SOURCES OF RECYCLED AGGREGATE
• PROPERTIES OF RECYCLED CONCRETE AGGREGATE
• PROCESS OF RECYCLED CONCRETE AGGREGATE
• ADVANTAGES & DISADVANTAGES OF RECYCLED CONCRETE
AGGREGATE
• CONCLUSIONS
• REFERENCES
INTRODUCTION:
• To achieve sustainable issue in construction
area, researchers and companies focus on using
waste concrete as a new construction material.
It is called recycled aggregate which can be
produced by concrete crusher.
• The aggregates are categorized by size as
coarse and fine aggregate.
WHAT IS RECYCLED CONCRETE AGGREGATE ?
• Recycled concrete aggregate has a proportional mortar which attached to
aggregate, it gives a higher porosity and a lower strength to RAC than the
normal concrete.
• In addition, since recycled aggregates require more amount of water than
natural aggregate, shrinkage issue could be a problematic to use RAC practically.
• It has a lower density, elastic modulus, strength and a higher water absorption
capacity.
• The enormous quantities of demolished concrete are available at various
construction sites.
• Many old buildings, concrete pavement ,bridges and other structures have
overcome their age and limit of use due to structural deterioration beyond
repair and need to be demolished.
• The structures, even adequate to use are under demolition because they are
not serving the needs in present scenario.
• Structures are turned into debris resulting from natural disasters like
earthquake, cyclone and floods etc.
SOURCEs OF AGGREGATE :
PROPERTIES OF RECYCLED AGGREGATE
 Particle size distribution
 Specific gravity
 Water absorption
 Compressive strength
PROCESS :
• For the production of the RC without impurity in the required gradation, a production plant
has to be used.
• This can either be stationary or mobile.
• However, both consist of the same setup which includes separation, crushing, separation and
removal of ferrous elements, screening, decontamination and removal of impurities.
Breaking up and removing
the old concrete.
Crushin
g separation of aggregates
ADVANTAGES:
• Save environment
• Save energy
• Reduce cost
• Reduce the demand of
natural aggregate.
DISADVANTAGES:
• Lack of specification and
guidelines.
• Less quality as it is a waste
material.
BENEFITS:
• Using recycled material as
gravel reduces the need for
gravel mining.
• Using recycled concrete as
the base material for
roadways reduces the
pollution involved in
trucking material.
 The physical properties of recycled aggregates make them ideally suited
for road base and sub-base. This is because of their physical properties
which means less cement is require making them suited for sub-base use.
This is in addition to the cost benefits accrued by developers in the
process.
 Recycle & reuse is an appropriate solution to problems of dumping
hundred of thousands of tons of demolition wastes. However more
research and initiation of project for application of RCA is started for
modifying design codes, Specifications & procedure for use of RCA.
CONCLUSIONS:
REFERENCES:
• Parekh D. N. and Dr. Modhera C. D., “Assessment of recycled aggregate concrete”, Volume II,
Issue 1, pp. 1-9, March 2011.
• Jitender Sharma, Sandeep Singla, “Study of Recycled Concrete Aggregates”, Volume 13, pp.
123-125, July 2014. RIMT-IET, Mandi Gobindgarh, PTU, India.
• Animesh Awasthi, Gourav Soni, Ram Bharosh, “Study of Recycled Aggregate Concrete as
Partial Replacement for Cement”, Volume 4, Issue 2, pp. 239-245, 2018.
• https://www.slideshare.net/neelanjan06/recycled-aggregate-concrete
• https://www.researchgate.net/publication/222515274_Recycled_concrete_aggregates
• https://www.sciencedirect.com/science/article/pii/S2352710221000528
Recycled Concrete Aggregate in Construction Part II

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Recycled Concrete Aggregate in Construction Part II

  • 1. USE OF RCA for construction CIVIL ENGINEERING DEPARTMENT ADITYA RANJAN PATRA (TRANSPORTATION ENGINEERING)
  • 2. CONTENTS: • INTRODUCTION • WHAT IS RECYCLED CONCRETE AGGREGATE • SOURCES OF RECYCLED AGGREGATE • PROPERTIES OF RECYCLED CONCRETE AGGREGATE • PROCESS OF RECYCLED CONCRETE AGGREGATE • ADVANTAGES & DISADVANTAGES OF RECYCLED CONCRETE AGGREGATE • CONCLUSIONS • REFERENCES
  • 3. INTRODUCTION: • To achieve sustainable issue in construction area, researchers and companies focus on using waste concrete as a new construction material. It is called recycled aggregate which can be produced by concrete crusher. • The aggregates are categorized by size as coarse and fine aggregate.
  • 4. WHAT IS RECYCLED CONCRETE AGGREGATE ? • Recycled concrete aggregate has a proportional mortar which attached to aggregate, it gives a higher porosity and a lower strength to RAC than the normal concrete. • In addition, since recycled aggregates require more amount of water than natural aggregate, shrinkage issue could be a problematic to use RAC practically. • It has a lower density, elastic modulus, strength and a higher water absorption capacity.
  • 5. • The enormous quantities of demolished concrete are available at various construction sites. • Many old buildings, concrete pavement ,bridges and other structures have overcome their age and limit of use due to structural deterioration beyond repair and need to be demolished. • The structures, even adequate to use are under demolition because they are not serving the needs in present scenario. • Structures are turned into debris resulting from natural disasters like earthquake, cyclone and floods etc. SOURCEs OF AGGREGATE :
  • 6. PROPERTIES OF RECYCLED AGGREGATE  Particle size distribution  Specific gravity  Water absorption  Compressive strength
  • 7. PROCESS : • For the production of the RC without impurity in the required gradation, a production plant has to be used. • This can either be stationary or mobile. • However, both consist of the same setup which includes separation, crushing, separation and removal of ferrous elements, screening, decontamination and removal of impurities.
  • 8. Breaking up and removing the old concrete. Crushin g separation of aggregates
  • 9. ADVANTAGES: • Save environment • Save energy • Reduce cost • Reduce the demand of natural aggregate. DISADVANTAGES: • Lack of specification and guidelines. • Less quality as it is a waste material. BENEFITS: • Using recycled material as gravel reduces the need for gravel mining. • Using recycled concrete as the base material for roadways reduces the pollution involved in trucking material.
  • 10.  The physical properties of recycled aggregates make them ideally suited for road base and sub-base. This is because of their physical properties which means less cement is require making them suited for sub-base use. This is in addition to the cost benefits accrued by developers in the process.  Recycle & reuse is an appropriate solution to problems of dumping hundred of thousands of tons of demolition wastes. However more research and initiation of project for application of RCA is started for modifying design codes, Specifications & procedure for use of RCA. CONCLUSIONS:
  • 11. REFERENCES: • Parekh D. N. and Dr. Modhera C. D., “Assessment of recycled aggregate concrete”, Volume II, Issue 1, pp. 1-9, March 2011. • Jitender Sharma, Sandeep Singla, “Study of Recycled Concrete Aggregates”, Volume 13, pp. 123-125, July 2014. RIMT-IET, Mandi Gobindgarh, PTU, India. • Animesh Awasthi, Gourav Soni, Ram Bharosh, “Study of Recycled Aggregate Concrete as Partial Replacement for Cement”, Volume 4, Issue 2, pp. 239-245, 2018. • https://www.slideshare.net/neelanjan06/recycled-aggregate-concrete • https://www.researchgate.net/publication/222515274_Recycled_concrete_aggregates • https://www.sciencedirect.com/science/article/pii/S2352710221000528