p ii r 3 mallick
TRANSCRIPT
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1
Study on the Sustainable Lightweight Concrete Masonry Blocks
using Coconut Husk
Prepared by
V SRINIVAS MALLICK
Project Batch No. : 02
(Reg. No. : 1521010023)
Review No. III
(Phase II)
Date: 09/April/2012
Guide
Dr. K GUNASEKARAN
Asst. Professor (S.G)
Department of Civil Engineering
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METHODOLOGY
YES
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MATERIAL PROPERTIES
Particle size analysis for husk : Percentage by weight of husk passing through
2.36mm sieve is less then 5%.
Cement
Specific Gravity 3.1
Normal Consistency 27% by cement weight
= 135ml of water
Initial Setting time 44 minutes
Final Setting time 5 hours 45 minutes
Coconut Husk
Un-compacted un-sieved density 432.10 kg/m3
Compacted un-sieved density 496.54 kg/m3
Un-compacted sieved density 428.31 kg/m3
Compacted sieved density 488.96 kg/m3
Sand
Density 2619 kg/m3
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Trail mix results
Ratio
( Cement : Husk)
Compressive Strength (N/mm2)
3-Day 7-Day 14-Day 28-Day
1 : 6 2.9 3.8 5.5 8.0
1 : 7 2.6 3.4 4.9 7.2
1 : 8 2.2 3.01 4.5 6.3
4Contd.,
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INFERENCES
The dimensions of block and mix of concrete selected to carry out
detailed experiments as per IS 2185 are as follows
Dimensions of block : 200 mm x 200 mm x 100 mm
(L) (B) (H)
Concrete mix : Cement : husk = 1 : 6 (by volume)
Water / cement ratio (w/c) : 0.67
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Progress of Work
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Summary of Test Results
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Type of
specimen
Block
Density
(kg/m3)
Compressive
Strength
(N/mm2)
Water
Absorption
(Kg/m3)
Drying
Shrinkage
(%)
Moisture
Movement
(%)
C-CH 1250 8.43 251.63 0.0403 0.014
CS 2170 14.7 107.3 0.0727 0.014
IS 21851600
(max.)
8
(min)
320
(max.)
0.09
(max.)
0.08
(max.)
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Product
Dimensions
(L x B x H)
C-CH (1 : 6) 200 x 200 x 100
C-CH (1 : 8) 200 x 200 x 100
CS (1:6) 200 x 200 x 100
Market VariantsMud Brick 190 x 90 x 90
Cement Block 190 x 90 x 90
Hollow Fly-Ash Block
140 x 190 x 390(80 x 130 x 190)
Hollow Fly-Ash Block
190 x 190 x 390(135 x 125 x 190)
Market Variants
Figure
{
Courtesy : SRM Constructions
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ProductC-CH
(1 : 6)
C-CH
(1 : 8)
CS
(1 :6)
Mud
Brick
Cement
Block
Hollow
Fly-Ash
Block
Hollow
Fly-Ash
Block
Dimensions
Length 200 200 200 190 190 390 390
Width 200 200 200 90 90 140 190
Height 100 100 100 90 90 190 190
Density 1250 1187 2170 1950 2275 2119 2295
Cost 12 9 11 3.5-6 6.6 27 32
Comparison 12 9 11 7-12 13.2 13 16
EconomicViability
Based on Raw Material Cost
Contd.
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Assuming a lintel beam of dimensions 1m x 0.23m x 0.15m, load coming onto it from
the wall above and the corresponding reduction in reinforcement (fck= 20 N/mm2,
fy = 250 N/mm2 ) is as follows
Economic Viability
Based on Reduction in Reinforcement
Parameter Mud Brick Wall C-CH brick wall
Beam c/s (m x m) 0.23 x 0.15 0.23 x 0.15
Load of wall
(1 x 1 x 0.23) (N)
5218.92 3433.5
Bending Moment (N-m) 652.37 429.19
Area of Steel (mm2) 1640.6 1640.4
Weight of Steel (in kg) 12.9 12.8
% Reduction 0.77
Contd.
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Maximum Productivity of mason = 3 m3 per worker day
No. of red mud bricks in 3 m3 volume = 1500
Weight handled in one day = 5850 kg
No. of C-CH blocks in 5850 kg weight = 1170
Volume of 1170 C-CH blocks = 4.38 m3 per worker day
% increase in productivity = 46
Economic Viability
Based on Labour Productivity
Contd.
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Comparison of bonding in C-CH and CS SEM Analysis
Fig. (in numerical order) SEM image of cement, husk, sand, C-CH and CS
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4 5
6 7
Courtesy : Dept. of Nano Technology, SRM University.
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1. Coconut husk can be validated as a building material as per IS 2185.
2. C-CH block shape proposed in this work can be used in all the brick laying directions.
3. The strengths developed by concrete made using 1: 7, 1:8 (Cement: Husk) by volume were
also superior to strength of generally used red mud bricks.
4. Readily available husk can be used without any further processing.
5. Material cost and reinforcement requirements will be reduced.
6. Labour productivity will be increased due to reduction in density of block.
7. Can be used as a locally available low cost building material.
8. Owing to its light weight damage caused during blasts, earthquakes etc can be reduced.
9. Crack development in the block during accidental loading is arrested.
CONCLUSIONS
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Future Scope
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This study is first of its kind on coconut husk mainly aimed at finding out the basic
interaction of cement with coconut husk, the results of which are promising. Future
work can be aimed on the following areas
1. Cement can be partially/ fully replaced with fly-ash to make the product more
environment friendly.
2. Fire resistance of the block should be found, as coconut husk is of plant origin.
3. Acoustic and thermal properties of coconut husk are to be explored.
4. Detailed chemical analysis is to be conducted on coconut husk to find its behaviour
in concrete in detail, so that full potent of husk can be explored.
5. Experiments should be directed to check the viability of block shape proposed in
this work with other materials.
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Future Scope
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Replacing cement fully/ partially with fly ash to make the product moreenvironmental friendly and more economical.
Fig. C-CH mix, FA-CH mix, oven curing of fly-ash blocks
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Paper Presentations on Project Work
Second in National Conference KEYNOTE-2012, conducted by CARE
group of institutions, Tiruchirapalli, on 9-10 February 2012.
Gold medal in RESEARCH DAY Celebrations, conducted by SRM
University, Kattankulathur, on 28 February 2012.
Second in AAKAAR-2012, National Civil Engineering Students
Symposium, organised by Department of Civil Engineering, IIT Bombay on
3-4 March 2012.
Presented Paper in RDCE-2012, National Conference, organised by
Department of Civil Engineering, SRM University on 21-22 March 2012.
Judged as one of the top ten ideas during INNOVATION DAY, organised
by SRM University on 28 March 2012.
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Snapshots of Presentations
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Fig. 1, 2 & 3 Prize distribution at Keynote, Research day and Aakaar
1 2
3
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Thank You
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