Ppt for engineering

1. AN EXPERIMENTAL STUDY ON THE EFFICIENT USE OF RECYCLED COARSE
AGGREGATE IN CONCRETE MADE FROM CONSTRUCTION AND DEMOLITION
WASTE

2. Abstract
The views of the several authors and construction industry are the utilization by consuming it in new concrete in various ways.
Replacement of fine aggregates, coarse aggregates and even cement has been attempted. Green concrete is produced by
replacing natural coarse aggregates in 5% 10% 20% 30% 50% dosage with coarse aggregates obtained from demolished old
concrete which was suggested by the several authors. Use of recycled in concrete has not much effect on the basic properties
(specific gravity, water absorption, unit weight and density) of Recycled coarse aggregates comparison with natural coarse
aggregates. Therefore, the use of this waste in new concrete not only helps in reducing the waste management issues but also
help protecting the environment greatly..In many countries like Japan, United States, United Kingdom various recycling
techniques are being used and returning good results. Process of recycling construction and demolition waste includes storage,
sorting, collection, transportation, recycling and disposing. Recycling methods used in japan are heating and rubbing methods,
eccentric-shaft rotor method and Mechanical grinding method.
Keywords :sustainable material engineering; building life cycle; waste construction materials; recycling; composite materials

3. Construction industry contains many elements which yield high carbon footprint including cement and aggregates production, transportation etc. and among all
of them, cement has one of the largest shares in generating carbon footprint. Production of cement results in 7% of world's total CO2 emission (Oh et al., 2014).
China is the biggest producer of cement followed by India with nearly 2350 million metric tonnes (“Cement statistics,” 2016). Concrete usually has different
compositions according to its required use, however, cement is an essential component with other major elements including sand, water, and gravels (Stolaroff
et al., 2005).
Sustainability in the construction industry is inevitable and this not only means that it must reduce carbon footprint and save the environment, but it should also
contribute to conserve the natural resources which are crucial for continuous growth. There are developments underway in reducing the depletion of natural
resources but averting 100% from natural resources is practically impossible and therefore it is necessary to consider sustainability while planning different
projects.
Several researchers have proposed different approaches to reduce the use of natural resources (cement, sand, and gravels, etc.) in the form of supplementary
cementitious materials. These include fly ash, silica fumes (Leung et al., 2016) and quicklime (Noor-ul-Amin, 2012) or waste products from different processes
such as ceramics (Awoyera et al., 2016), palm oil waste (Ul Islam et al., 2016), tire rubber waste (Thomas et al., 2016) and clay and recycled aggregates
(Muñoz-Ruiperez et al., 2016). The incorporation of these materials often changes the properties of concrete on both sides of the scale, however, their addition
always helps to cope with waste produced through different materials with an opportunity to reduce the handling cost of waste.
Introduction

4. Literature Review
S.no Author Name Title Year
Research
Variable
Research
Findings
1 M.S.I. Choudhury
Constructing a
low-budget house
using recycled
concrete and
demolition waste.
2016
Constructing a
low-budget house
using recycled
concrete and
demolition waste.
In this research
paper they have
concluded that the
Influence of class
F fly ash and
curing temperature
on strength
development of fly
ash-recycled
concrete aggregate
blends

5. Literature Review
S.no Author Name Title Year
Research
Variable
Research
Findings
2 M. Behera
Constructing a
low-budget house
using recycled
concrete and
demolition waste.
2017
Constructing a
low-budget house
using recycled
concrete and
demolition waste.
In this research
paper they have
concluded that the
Recycled
aggregate from
C&D waste & its
use in concrete a
breakthrough
towards
sustainability in
construction sector.

6. Literature Review
S.no Author Name Title Year
Research
Variable
Research
Findings
3 S. Chithra
Constructing a
low-budget house
using recycled
concrete and
demolition waste.
2016
Constructing a
low-budget house
using recycled
concrete and
demolition waste.
In this research
paper they have
concluded that the
The effect of
Colloidal Nano-
silica on
workability,
mechanical and
durability
properties of
Concrete with
Copper slag as
partial fine
aggregate
Construct.

7. Material
Sourcing
Construction Finalization and
Occupancy
Site Assessment
and Design
Planning

8. Compressive Strength Test: This test evaluates the ability of the concrete to withstand compressive loads.
ASTM C39/C39M provides the standard test method for compressive strength of cylindrical concrete
specimens.
Flexural Strength Test: This test measures the strength of concrete in bending. ASTM C78/C78M outlines the
standard test method for flexural strength of concrete.
Sustainability Assessment: Consider conducting a life cycle assessment (LCA) to evaluate the
environmental impacts of using recycled concrete, including energy consumption, carbon footprint, and
resource depletion.
Experimental
Tests

9. Experimental
Tests
Bond Strength Test: This test evaluates the bond strength between recycled concrete and other materials
such as reinforcement bars. ASTM C234 provides the standard test method for comparing concretes on
the basis of bond developed with reinforcing steel.
Fire Resistance Test: This test assesses the fire resistance of concrete structures. ASTM E119 provides
the standard test methods for fire tests of building construction and materials.
Carbonation Test: This test determines the depth of carbonation in concrete, which affects its durability.
ASTM C1219 provides the standard test method for concrete's resistance to carbonation.

10. Chloride Ion Permeability Test: This test evaluates the resistance of concrete to chloride ion penetration,
which can cause corrosion of reinforcing steel. ASTM C1202 provides the standard test method for electrical
indication of concrete's ability to resist chloride ion penetration.
Water Absorption Test: This test assesses the permeability of concrete by measuring the amount of water
absorbed. ASTM C1585/C1585M provides the standard test method for measurement of rate of absorption
of water by hydraulic-cement concretes.
Freeze-Thaw Resistance Test: This test assesses the durability of concrete against freeze-thaw cycles.
ASTM C666/C666M provides the standard test method for resistance of concrete to rapid freezing and
thawing.
Experimental
Tests

11. conclusio
n
This study demonstrates that the use of RCA (Recycled Coarse Aggregate) in concrete can
offer numerous technical advantages, as well as numerous environmental and anticipated
financial advantages. The study has demonstrated that recycled good quality aggregates may
be generated with equipment identical to that used for the production of crushed rock
aggregates, regardless of the kind or strength of the original concrete. It is obvious that this
knowledge would persuade demolition contractors to use demolished materials to make
RAC (Recycled Aggregate Concrete) for use in new concrete.

12. conclusio
n
In general, it is concluded that recycled concrete aggregates having potential use in
concrete to make green concrete. The concrete with inclusion of recycled concrete
aggregates can be used for the high value application as it has both improved engineering
properties as well as durability properties. The concrete mixes with steel fibres and silica
fume enhances the ductility and energy absorption characteristics substantially which are
needed in seismic prone areas.

13. Thank you!