STRATEGIES TO DERIVE AGGREGATE
FROM CONCRETE WASTE
FOR CONCRETE PRODUCTION
ASIF ZAFFAR ANSARI
1400100496
Masters in Construction Technology & Management
Department of Civil Engineering
Integral University, Lucknow
2022-23
Introduction
Objective
Historical Background
CONTENT Description
Site Details
Learning
Technical Benefits
INTRODUCTION
For my directed study, I chose J R Construction & Interiors, Lucknow, to study
the topic of the course is Strategies to derive aggregate from concrete waste for
concrete production (SDG-9)
Recycling of aggregate is a process in which used aggregate is reused for new construction.
There is huge requirement of the aggregate because of fast development in the
infrastructure area.
In order to reduce the uses of fresh aggregate, we can use recycled aggregate as a
replacement materials.
Recycled aggregate can be obtained from dismantled concrete waste (at the time of
concrete production or at the time of pour) or any structure demolition.
Recycled aggregate can be derived by manually (hammer) or by concrete crusher.
The characteristic of recycled aggregates could be different by its parent concrete.
OBJECTIVE
To achieve sustainable issue in construction area.
To reduce the impact of waste materials on environment.
To study the various properties of selected material like gradation, water absorption,
maximum dry density, impact value, flakiness and elongation.
To study the process, strategies to derive aggregate from dismantled concrete.
HISTORICAL BACKGROUND
One of the first usage of Recycled Aggregate in Norway was the building of new tramline in
Gaustadbekkdalen in Oslo, 1999.
4000 m3 of RA (38–120 mm) were employed as base materials (0.4–1.4 m depth) on top of a
lightweight filling (Myhre et al., 2003).
In the same demonstration project, 100 m3 of shotcrete containing up to 20% 0–4 mm
recycled sand was placed on the vertical sides of an EPS lightweight filling (Lahus et al.,
2002).
In 2011, road construction with Recycled Aggregate commenced in Estonia and similar
results were obtained (Talvik, 2014).
Early full-scale laboratory tests showed that Recycled Aggregate may have even better
drainage characteristics and lower bulk density than NA, and thus are also suitable as backfill
material for utility trenches (Mehus et al., 2002).
Wilmot and Vorobieff (1997) stated that recycled aggregate have been used in road industry
for the last 100 years in Australia. They also stated that the use of recycled aggregate for the
construction and rehabilitation of local government roads has a great improvement in the last
five years.
Hanson and Torben (1986) stated that, the research on recycled aggregate had been carried
out in many countries. The main aim that testing the recycled aggregate is to find out the result
of the strength characteristic on it and analysis whether recycled aggregate is suitable to apply
in the place of fresh aggregate in construction of road
Limbachiya and Leelawat (2000) found that recycled aggregate had lower relative density
and water absorption capacity is less to fresh aggregate. According to their test results, there
was no effect with the replacement of 30% coarse recycled aggregate used on the strength of
fresh aggregate.
Sagoe, Brown and Taylor (2002) stated that the difference between the characteristic of fresh
recycled aggregate and natural aggregate is relatively narrower than reported for laboratory
crush recycled aggregate mixes.
Mandal, Chakaborty and Gupta (2002) found that the compressive strength was somewhat
increase when the amount replacement of recycled increased. They concluded that the
properties and characteristic of recycled aggregate has sufficient deficiency when compared to
the fresh aggregate.
According to Tavakoli (1996) the strength characteristics of recycled aggregate were
influenced by the some inorganic impurities, the ratio of coarse aggregate to fine aggregate,
and the ratio of top size of the aggregate in the in the recycled aggregate.
Florida Department of Transportation (FDOT) specifications recommended that Los
Angeles abrasion loss should be less than 45% and Soundness by sodium sulphate test should
be less than 15% for the use of recycled concrete aggregate as a base material in flexible
pavements.
DESCRIPTION
Concrete Waste
Waste from used concrete, large amount of waste are generated during concrete production and
use. It can be generated at the time of concrete production, at the time of pour or from any
structure demolition.
Sources of Concrete Waste
Building Construction
Renovation
Demolition Sites
Demolition of CC Roads
TIFAC report (2001) states that estimated waste generated during construction is about 40 to
60 kg per sqm of build-up area. Similarly waste generation during renovation and repair work is
estimated to be about 40 to 50 kg per sqm of build-up area. And 300-500 kg per sqm for
demolition of buildings. India added 1 billion sqm of housing in 2013. the construction &
Demolition waste generated from new construction in the year 2013 would be about 50 million
tonnes.
SITE DETAILS
LEARNINGS
TECHNICAL BENIFITS
THE CHOICE IS OURS
To Landfill To Recycle
THANK YOU
