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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 231
A REVIEW ON RECYCLED FINE AGGREGATE CONCRETE
K.S. Prasath1, R. Goudhamaram2, E. Dinesh3
1Assistant Professor, Department of civil Engineering, Sri Manakula Vinayagar Engineering College,
Puducherry, India
2,3UG students, Department of civil Engineering, Sri Manakula Vinayagar Engineering College, Puducherry, India
---------------------------------------------------------------------***----------------------------------------------------------------------
Abstract - Concrete is a construction material composed of
cement, fine aggregates (natural river sand/NFA) and coarse
aggregates mixed with water which hardens withtime. Due to
scarcity of fine aggregate there is need for the alternation. In
this study we prefer the recycled fine aggregate which is get
from the construction demolition waste because day by day
life the demolition of structure is highly enormous due to the
age of buildings and poor construction techniques. And that
waste pollutes the environment badly. Therefore by using
recycled fine aggregate (RFA) as a fine aggregates it will be
environmental friendly and also solution for the demand of
fine aggregate. Replacement of fine aggregatebyrecycledfine
aggregate up to 100% but by increasing the percentage of
RFA in concrete it will affect the strength of concrete due toits
water absorption property in that stage nano materials are
used for increasing the strength of concrete because the nano
materials have the C-S-H gel property.
Key Words: concrete, recycled fine aggregate, river sand,
nano materials, C-S-H gel
1. INTRODUCTION
Concrete, usually Portland cement concrete, is a composite
material composed of fine and coarse aggregate bonded
together with fluid cement (cement paste)thathardensover
time—most frequently a lime-based cement binder, such as
Portland cement, but sometimes with other hydraulic
cements, such as a calcium aluminate cement. When
aggregate is mixed together with dry Portland cement and
water, the mixture forms fluid slurry that is easily poured
and molded into shape. The cement reacts chemically with
the water and other ingredients to form a hard matrix that
binds the materials together into a durable stone-like
material that has many uses. Often, additives (such as
pozzolans or super plasticizers) are included in the mixture
to improve the physical properties of the wet mix or the
finished material. Most concrete is poured with reinforcing
materials (such as rebar) embedded to provide tensile
strength, yielding reinforced concrete. Now a day’s river
sand is so demand, so the alternate one is very important for
the society. We are refer recycled fine aggregate (RFA) that
is construction demolition waste is the best replacer for the
river sand because construction demolitionwaste,40%isof
concrete , 30% ceramic’s, 5% plastics, 10% wood, 5% metal
and 10% other mixtures. By using construction wasteasfine
aggregate will not affect the environmentandalsoscarcityof
fine aggregate that is river sand.
2. MATERIAL INVESTIGATION
2.1 Cement
Cement is a binder, a substance used for construction that
sets, hardens, and adheres to other materials to bind them
together. Cement is seldom used on its own, but rather to
bind sand and gravel (aggregate) together. Cement mixed
with fine aggregate produces mortar for masonry, or with
sand and gravel, produces concrete. Cement is the most
widely used material in existence and is only behind water
as the planet's most-consumed resource. Here we are using
OPC 43 grade cement. Table 1 show the physical properties
of cement
Table -1: Physical Properties of Cement (OPC 43)
Sl. No Property Value
1 Specific gravity 3.14
2 Standard consistency 31 %
3 Initial setting time 50 mins
4 Final setting time 400 mins
2.2 Aggregates
Aggregate is a broad category of coarse to medium grained
particulate material used in construction, including sand,
gravel, crushed stone, slag, recycled concrete and
geosynthetic aggregates. Aggregates are the most mined
materials in the world. Aggregates are a component of
composite materials such as concrete and asphalt concrete;
the aggregate serves as reinforcement to add strengthtothe
overall composite material. Table 2and3showsthephysical
properties of fine aggregate and coarse aggregate
respectively
Table -2: Physical Properties of Fine aggregate
Sl. No Description Quantity
1 Specific gravity 2.6
2 Water absorption (%) 1.7
3 Bulk density(kg/m3) 1680
4 Fineness modulus 2.97
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 232
Table -3: Physical Properties of Coarse aggregate
Sl. No Description Quantity
1 Specific gravity 2.62
2 Water absorption (%) 1.21
3 Bulk density(kg/m3) 1560
2.3 Recycled fine aggregate
Crushed concreteaggregates alsocalled as recycledconcrete
aggregates are fragments and pieces of concrete buildings
which are demolished or rebuild. Thesecrushedconcreteare
cleaned from dirt and broken to smaller pieces to
manufacture aggregate which is termed as recycled
aggregate. Table 4 shows the physical properties of recycled
fine aggregate
Table -4: Physical Properties of Recycled Fine aggregate
Sl. No Description Quantity
1 Specific gravity 2.4
2 Water absorption (%) 2.04
3 Bulk density(kg/m3) 1360
4 Fineness modulus 3.35
2.4 Super plasticizer (SP)
Super plasticizers, also known as high range water reducers,
are chemicaladmixtures used where well-dispersed particle
suspension is required. These polymers are used as
dispersants to avoid particle segregation (gravel, coarse and
fine sands), and to improve the flow characteristics
(rheology) of suspensions such asinconcreteapplications.In
this review we are prefer the supaflo as a SP.
2.5 Nano Materials
Nanomaterials describe, in principle, materials of which a
single unit is sized (in at least one dimension) between 1 to
1000 nanometers. Nano materials like nano silica, carbon
nano tubes etc. having the capacityforformationofextraC-S-
H gel it will gain the strengthof concrete while increasingthe
percentage of recycled fine aggregate
3. COMPARISON
Chart -1: Comparison of physical properties of NFA & RFA
By comparing the physical properties of natural fine
aggregate and the recycled fine aggregate, specific gravity
and bulk density of NFA are higher than the RFA. While the
water absorption and the fineness modulus of RFA are
higher than the NFA it denotes the RFA is a demolitionwaste
one so that the water absorption and the fineness modulus
are greater than the other. So finally the water cement ratio
of natural fine aggregate concrete is very low ratio will use
compared to the recycled fine aggregate concrete
4. CONCLUSIONS
From this project we concluded,
 Recycled fine aggregate is the best replacing
material for the scarcity of natural fine
aggregate/river sand
 Lower w/c ratio for Recycled fine aggregate
concrete compared with natural fine aggregate
concrete
 By using RFA it will be Environmental friendly
because of using the construction demolition waste
 By increasing the replacement percentage of RFA it
will lose the strength of concrete at certain point
 During that time nano materials helps to improve
the strength of concrete because nano materials
form the C-S-H gel while reacting with the cement
and water.
REFERENCES
[1] Kou and Poon (2013) “Effects of Different Kinds of
Recycled Fine Aggregate on Properties of Rendering
Mortar”, Journal of sustainable cement based materials.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 233
[2] Serifou, Z.M. Sbartai, S. Yotte, M.O Boffoue, E. Emeruwa
and F. Bos (2013) “A Study of Concrete Made With Fine
And Coarse Aggregates Recycled From Fresh Concrete
Waste”, Journal Of Construction Engineering.
[3] Yehia, Helal, Abusharkh, Zaher, and Istaitiyeh (2015)
“Strength and Durability Evaluation of Recycled
Aggregate Concrete”, International Journal Of Concrete
Structures and Materials.
[4] Zega and Maio (2011) “Use of Recycled Fine Aggregate
in Concretes with Durable Requirements”, Waste
Management, 31, 2336-2340.
[5] Zhu, Wang and Feng (2012) “Research on Properties Of
Recycled Fine Aggregate From Waste Recycled
Aggregates Concrete”, Advance Materials Research.

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IRJET- A Review on Recycled Fine Aggregate Concrete

  • 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 231 A REVIEW ON RECYCLED FINE AGGREGATE CONCRETE K.S. Prasath1, R. Goudhamaram2, E. Dinesh3 1Assistant Professor, Department of civil Engineering, Sri Manakula Vinayagar Engineering College, Puducherry, India 2,3UG students, Department of civil Engineering, Sri Manakula Vinayagar Engineering College, Puducherry, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Concrete is a construction material composed of cement, fine aggregates (natural river sand/NFA) and coarse aggregates mixed with water which hardens withtime. Due to scarcity of fine aggregate there is need for the alternation. In this study we prefer the recycled fine aggregate which is get from the construction demolition waste because day by day life the demolition of structure is highly enormous due to the age of buildings and poor construction techniques. And that waste pollutes the environment badly. Therefore by using recycled fine aggregate (RFA) as a fine aggregates it will be environmental friendly and also solution for the demand of fine aggregate. Replacement of fine aggregatebyrecycledfine aggregate up to 100% but by increasing the percentage of RFA in concrete it will affect the strength of concrete due toits water absorption property in that stage nano materials are used for increasing the strength of concrete because the nano materials have the C-S-H gel property. Key Words: concrete, recycled fine aggregate, river sand, nano materials, C-S-H gel 1. INTRODUCTION Concrete, usually Portland cement concrete, is a composite material composed of fine and coarse aggregate bonded together with fluid cement (cement paste)thathardensover time—most frequently a lime-based cement binder, such as Portland cement, but sometimes with other hydraulic cements, such as a calcium aluminate cement. When aggregate is mixed together with dry Portland cement and water, the mixture forms fluid slurry that is easily poured and molded into shape. The cement reacts chemically with the water and other ingredients to form a hard matrix that binds the materials together into a durable stone-like material that has many uses. Often, additives (such as pozzolans or super plasticizers) are included in the mixture to improve the physical properties of the wet mix or the finished material. Most concrete is poured with reinforcing materials (such as rebar) embedded to provide tensile strength, yielding reinforced concrete. Now a day’s river sand is so demand, so the alternate one is very important for the society. We are refer recycled fine aggregate (RFA) that is construction demolition waste is the best replacer for the river sand because construction demolitionwaste,40%isof concrete , 30% ceramic’s, 5% plastics, 10% wood, 5% metal and 10% other mixtures. By using construction wasteasfine aggregate will not affect the environmentandalsoscarcityof fine aggregate that is river sand. 2. MATERIAL INVESTIGATION 2.1 Cement Cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Cement is the most widely used material in existence and is only behind water as the planet's most-consumed resource. Here we are using OPC 43 grade cement. Table 1 show the physical properties of cement Table -1: Physical Properties of Cement (OPC 43) Sl. No Property Value 1 Specific gravity 3.14 2 Standard consistency 31 % 3 Initial setting time 50 mins 4 Final setting time 400 mins 2.2 Aggregates Aggregate is a broad category of coarse to medium grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete; the aggregate serves as reinforcement to add strengthtothe overall composite material. Table 2and3showsthephysical properties of fine aggregate and coarse aggregate respectively Table -2: Physical Properties of Fine aggregate Sl. No Description Quantity 1 Specific gravity 2.6 2 Water absorption (%) 1.7 3 Bulk density(kg/m3) 1680 4 Fineness modulus 2.97
  • 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 232 Table -3: Physical Properties of Coarse aggregate Sl. No Description Quantity 1 Specific gravity 2.62 2 Water absorption (%) 1.21 3 Bulk density(kg/m3) 1560 2.3 Recycled fine aggregate Crushed concreteaggregates alsocalled as recycledconcrete aggregates are fragments and pieces of concrete buildings which are demolished or rebuild. Thesecrushedconcreteare cleaned from dirt and broken to smaller pieces to manufacture aggregate which is termed as recycled aggregate. Table 4 shows the physical properties of recycled fine aggregate Table -4: Physical Properties of Recycled Fine aggregate Sl. No Description Quantity 1 Specific gravity 2.4 2 Water absorption (%) 2.04 3 Bulk density(kg/m3) 1360 4 Fineness modulus 3.35 2.4 Super plasticizer (SP) Super plasticizers, also known as high range water reducers, are chemicaladmixtures used where well-dispersed particle suspension is required. These polymers are used as dispersants to avoid particle segregation (gravel, coarse and fine sands), and to improve the flow characteristics (rheology) of suspensions such asinconcreteapplications.In this review we are prefer the supaflo as a SP. 2.5 Nano Materials Nanomaterials describe, in principle, materials of which a single unit is sized (in at least one dimension) between 1 to 1000 nanometers. Nano materials like nano silica, carbon nano tubes etc. having the capacityforformationofextraC-S- H gel it will gain the strengthof concrete while increasingthe percentage of recycled fine aggregate 3. COMPARISON Chart -1: Comparison of physical properties of NFA & RFA By comparing the physical properties of natural fine aggregate and the recycled fine aggregate, specific gravity and bulk density of NFA are higher than the RFA. While the water absorption and the fineness modulus of RFA are higher than the NFA it denotes the RFA is a demolitionwaste one so that the water absorption and the fineness modulus are greater than the other. So finally the water cement ratio of natural fine aggregate concrete is very low ratio will use compared to the recycled fine aggregate concrete 4. CONCLUSIONS From this project we concluded,  Recycled fine aggregate is the best replacing material for the scarcity of natural fine aggregate/river sand  Lower w/c ratio for Recycled fine aggregate concrete compared with natural fine aggregate concrete  By using RFA it will be Environmental friendly because of using the construction demolition waste  By increasing the replacement percentage of RFA it will lose the strength of concrete at certain point  During that time nano materials helps to improve the strength of concrete because nano materials form the C-S-H gel while reacting with the cement and water. REFERENCES [1] Kou and Poon (2013) “Effects of Different Kinds of Recycled Fine Aggregate on Properties of Rendering Mortar”, Journal of sustainable cement based materials.
  • 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 233 [2] Serifou, Z.M. Sbartai, S. Yotte, M.O Boffoue, E. Emeruwa and F. Bos (2013) “A Study of Concrete Made With Fine And Coarse Aggregates Recycled From Fresh Concrete Waste”, Journal Of Construction Engineering. [3] Yehia, Helal, Abusharkh, Zaher, and Istaitiyeh (2015) “Strength and Durability Evaluation of Recycled Aggregate Concrete”, International Journal Of Concrete Structures and Materials. [4] Zega and Maio (2011) “Use of Recycled Fine Aggregate in Concretes with Durable Requirements”, Waste Management, 31, 2336-2340. [5] Zhu, Wang and Feng (2012) “Research on Properties Of Recycled Fine Aggregate From Waste Recycled Aggregates Concrete”, Advance Materials Research.