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RECENT TRENDS IN CIVIL ENGINEERING PRACTICES

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Although building homes, roads, ... Use of aluminium formwork system like Mivan , ... SOME MORE RECENT INNOVATIONS HIGH GRADE CONSTRUCTION MATERIAL For ... – PowerPoint PPT presentation

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Title: RECENT TRENDS IN CIVIL ENGINEERING PRACTICES


1
RECENT TRENDS IN CIVIL
ENGINEERING PRACTICES
SUMITA DEY General Manager (Engineering) Mani
Square Limited Kolkata
25th September 2014
2
PREAMBLE
Civil Engineering is regarded to be the mother of
all engineering. Although building homes, roads,
bridges, sewerage etc. is as old as civilisation
itself, we continually see new trends emerging.
New thoughts, innovations and techniques are fast
replacing age old practices and traditional
methods of construction.
Like in every other field, the real estate sector
has also seen a number of such innovations and
adoption of the state-of-the-art in construction
techniques.
3
SOME RECENT INNOVATIONS
4
TALL BUILDINGS
All over the world builders are starting to build
higher and higher. In India, mainly in the
metropolises, the skyline has risen.
In Kolkata, due to a set of new building laws,
builders have started to add floors to buildings
already under construction.
New buildings are being planned for heights
hitherto unheard of in the city of Kolkata.
5
The structural engineer has to find ways and
means to make the structure capable to withstand
the additional loads, to reduce the loads or
simply to make more correct assumptions and
recalculate loads.
6
ADVENT OF SOFTWARE
The advent of latest and powerful software and
hardware take seconds to analyse the model of a
huge multi-storeyed building. This makes
innumerable iterations possible in no time.
7
REDUCTION OF LOADS
AAC Blocks Air entrained autoclaved blocks are
basically lightweight bricks. The specific
gravity of these bricks are less than half
compared to conventional clay or fly-ash bricks.
Steel Floor Plates Extending an RC building by
using steel columns/steel beams and a thin layer
of concrete slab for buildings whose foundations
and lower level columns have already been
constructed.
8
REDUCTION OF LOADS (contd)
RC Load Bearing Walls Walls may be designed as RC
load bearing members. Use of aluminium formwork
system like Mivan, in which 160 mm thick RC
external and internal walls carry the loads. As a
result no columns, no beams and reduced slab
thickness due to smaller panels.
9
(No Transcript)
10
What has made tall buildings possible in Kolkata
where the sub-soil conditions are hardly
conducive to weighty structures? Other than
social and psychological barriers, Kolkata was
probably missing the structural atmosphere to
build structures that would kiss the clouds.
11
SOME MORE RECENT INNOVATIONS
12
HIGH GRADE CONSTRUCTION MATERIAL
For reinforcing steel, Fe 250 gave way to
Fe 415, which made way for Fe 500. We now
use Fe 550 or Fe 600.
For concrete, M 15 gave way to M 20, which made
way for M 25. The number after M kept on
increasing and reached the improbable figure of
70 i.e. M 70, which is quite common these days.
13
TYPICAL DESIGN MIX FOR M40 GRADE CONCRETE
  • Cement (OPC) 360 Kg
  • Flyash 120 Kg
  • 20 mm down aggregates 592 Kg
  • 10 mm down aggregates 484 Kg
  • Sand (Zone II) 718 Kg
  • Water 158 Kg (w/c ratio 0.33)
  • Admixture 2 Kg (_at_0.4)
  • Strength at 7 days 32 to 36 MPa
  • Strength at 28 days 45 to 49 MPa

14
METHODS OF SHUTTERING/STAGING AND DETAILING
The Rail Climbing system have helped to
increase the speed of construction manifold.
15
METHODS OF SHUTTERING/STAGING AND DETAILING
In another system of staging, the props are left
in place and only the shutters are removed.
16
METHODS OF SHUTTERING/STAGING AND DETAILING
Use of couplers instead of lapping of bars has
helped reduce congestion and wastage. It is also
possible to have 100 lap at one place, as per
code.
17
METHODS OF SHUTTERING/STAGING AND DETAILING
Creation of safety platform has helped in
enhancement of worker productivity by creating a
psychological feeling that they are working at
ground level. This has contributed to a large
extent in increasing the speed of work.
18
CONCLUSION
This presentation dealt with only a particular
sector of Civil Engineering and some of the
recent trends being adopted.
I have, however, scratched only the surface.
Scores of innovations and modern techniques have
come in vogue during the last decade, both in
design and execution.
Every day, some new technique is being introduced
at some part of the globe thereby encouraging
smarter designs, slicker structures, robust and
safer construction practices.
19
THANK YOU
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