Advanced Research in Recycled Aggregate concrete
Transcript of Advanced Research in Recycled Aggregate concrete
1 Expert Lecture Report
1
DEPARTMENT OF CIVIL ENGINEERING
“Advanced Research in Recycled Aggregate concrete”
18th March 2017
Presented By:
Dr. D. N. Parikh
Lecturer, BPTI, Bhavnagar
AT
GMIT, Bhavnagar
Principal H.O.D.
Dr. H.M. Nimbark Prof. K.V. Purohit
2 Expert Lecture Report
2
Content
(1) Acknowledgement 3
(2) Information 4
(3) Topic of Expert Lecture 4
(4) What we learnt? 5
(5) Valedictory 9
3 Expert Lecture Report
3
ACKNOWLEDGEMENT
We the students of civil engineering, are really thankful to our
Principal and the Head of the Department of civil branch of GMIT,
Dr. H.M. Nimbark sir and Prof. Kishan Purohit respectively, for the
knowledge sharing session of “Recycled Aggregate Concrete”
Lecture GMIT, Bhavnagar.
We are also thankful to Dr. D.N. Parikh Sir, Lecturer at BPTI,
Bhavnagar to share the valuable knowledge to us. It will be very
helpful to us in future whenever we start our professional career or at
post graduation programme or in final year project also.
4 Expert Lecture Report
4
General Information regarding expert lecture
The department of Civil Engineering has organized an Expert
Lecture on “Advanced Research in Recycled Aggregate Concrete” on
18th March 2017 at GMIT, Bhavnagar.
Recycled aggregates are the materials for the future.
Urbanization growth rate in India is very high due to industrialization.
Growth rate of India is reaching 9% of GDP. Rapid infrastructure
development requires a large quantity of construction materials, land
requirements & the site. For large construction, concrete is preferred
as it has longer life, low maintenance cost & better performance. For
achieving GDP rate, smaller structures are demolished & new towers
are constructed. Protection of environment is a basic factor which is
directly connected with the survival of the human race. Parameters
like environmental consciousness, protection of natural resources,
sustainable development, play an important role in modern
requirements of construction works. Due to modernization,
demolished materials are dumped on land & not used for any purpose.
Topic of Expert Lecture
Our main purpose for this expert lecture is to be familiar with
industrial environment and to get research knowledge of advanced
concrete technology and use of its various concrete in field. Also in
4th semester subject like concrete technology requires knowledge
about how different ingredients, research are shared in the field, so it
is very much convenient to see the research and components in real
time work environment.
5 Expert Lecture Report
5
What We Learnt
Concrete is the premier construction material across the world
and the most widely used in all types of civil engineering works,
including infrastructure, low and high-rise buildings, defense
installations, environment protection and local/domestic
developments. Concrete is a manufactured product, essentially
consisting of cement, aggregates, water and admixture(s). Among
these, aggregates, i.e. inert granular materials such as sand, crushed
stone or gravel form the major part. Traditionally aggregates have
been readily available at economic price. However, in recent years the
wisdom of our continued wholesale extraction and use of aggregates
from natural resources has been questioned at an international level.
This is mainly because of the depletion of quality primary aggregates
and greater awareness of environmental protection. In light of this, the
availability of natural resources to future generations has also been
realized.
Waste arising from Construction and Demolition constitutes one
of the largest waste streams within the EU, Asian and many other
countries. For example, it is estimated that core waste (described as
those types of materials which are obtained from demolished building
or civil engineering infrastructure) amounts to around 180 million
tonnes per year or 480kg/person/yr in the EU. This ranges from over
700 kg/person/yr in Germany and the Netherlands to under 200 in
Sweden, Greece and Ireland. The estimates for the UK are 30million
6 Expert Lecture Report
6
tonnes/yr and just over 500 kg/person/yr respectively, putting the UK
in second place behind Germany.
This is in addition to large quantities that are dumped illegally.
Thus, construction demolition waste has become a global concern that
requires sustainable solution.
The compressive strength seems to increase slightly with the
addition of RCA. This could be due to the higher absorption capacity
of the recycled aggregate. When the water is absorbed by aggregate,
more space left by the water being absorbed can be occupied by
aggregates in a unit volume. Hence the density of recycled concrete is
lower.
It is observed from the fractured surface of RCA with high
amount of recycled coarse aggregates, the failure is not only through
the interface but also through the recycled aggregates. The split
7 Expert Lecture Report
7
tensile strength of RCA reduces with the increase in amount of RCA.
The split tensile strength of recycled concrete with replacement of
50% of RCA was higher than the split tensile strength of the control
concrete.
The split tensile strength of recycled concrete with replacement
of 100% RCA was less than split tensile strength of control concrete.
As with the compressive strength, the split tensile strength of recycled
concrete is higher during early stage but it gains strength at a slower
rate during later stages. The splitting tensile strength gives more
uniform results as compared to compressive strength.
8 Expert Lecture Report
8
It can be concluded that RCA upto 50% is satisfactory to use. It
will also be economical with the reduce in transportation cost of
dumping the aggregates. Primary reason of strength reduction may be
the adhered mortar to the RCA and other non-aggregate material. This
can be corrected by using proper cleaning techniques and casting
methods under highly skilled supervision.
9 Expert Lecture Report
9
Valedictory
At the end of the expert lecture, few question were asked from the
faculty as well as among from the students and all the students were
found very interesting and interacting session. At the valedictory
session, 4th Semster civil student Chirag Chavda had felicitated Dr. D.
N. Parikh sir with a memento.
10 Expert Lecture Report
10
PREPARED BY Joshi Jay
Kishan Kabir
Trivedi Malay
ParMar Kishan
Yash Kajawadra