study of self-compacting concrete for economical construction
TRANSCRIPT
A Presentation on ‘Study of Self-compacting concrete
for economical construction’
Presented by,GOHIL RAJAT D. 126120306549PIPALIYA RUJAL G. 126120306529PASTAGIA TEJAS K. 126120306530CHANDRESHA PARTH A. 126120306543
Dr. S. & S.S Gandhy college of Engg. and Tech.
surat.
Guided by: - Prof. Alok Tiwari
Project overview It is challenging to produce high strength concrete and the one
of the major reason for this is presence of air voids. At present to reduce these voids many compacting machines like vibrators are used in field. But, this leads to high noise pollution and irritation the person working on site.
Thus, to eliminate this problem related to compaction, strength and noise So, A new concrete called Self-Compacting Concrete [SCC] is introduced.
The limitation with such concrete is that cement content is high so increase the cost. So, our project aims to produce a self-compacting concrete and compare both concrete for economical construction.
Introduction What is Self-compacting concrete?
SCC is defined as concrete that is able to flow and consolidate under its own weight, completely fill to formwork even in the presence of dense reinforcements & maintaining homogeneity without compaction.” It contains Water, Cement, Sand, Aggregate and some common chemical additives.
Problems with ordinary Concrete :-
Scarcity of skilled manpower Increased cost of manpower and materials Inconsistent construction quality Inadequate compaction in densely reinforced concrete Noise pollution due to vibration Increasing cost of Repair and maintenance
Background of Self-Compacting Concrete :-
Year Event Place
March-1986 Proposal for self-compacting concrete by okamura Japan
August-1988 Completion of a prototype by okamura Japan
January-1989 A presentation by okamura at second east-Asia & pacific structural engineering & construction.(EASFC-2)
Ching-mai
July-1989 And open experiment University of Tokyo, japan
March-1992 Presentation on SCC by ozawa at CANMET & ACI international conference
Istanbul
September-1993 Text book on Self-compacting concreting HPC in Japanese Japan
November-1994 ACI workshop on HPC sponsored by prof. poulzia Bangkok
January-1997 RILEM committee found SCC -
August-1998 Preceding of international on self-compacting concreteKochi university of
technology, tosayamada Kochi.
Advantages of self-compacting concrete :-
The improved construction performance, combined with the health
and safety benefits make.
No mechanical vibration required.
Improved and more uniform architectural surface finish.
Ease of filling conjunction reinforcement and hard-to-reach areas.
Manpower cost savings.
Shorter construction periods.
Resulting cost savings.
Accelerates project schedules.
Reduced equipment cost.
Produces superior surface finishes.
Attractive solution for both precast concrete and cast-in-situ.
Improved consolidation around reinforcement and bond with
reinforcement.
Flows into complex forms.
Minimizes voids on highly reinforced areas.
Produces superior surface finishes.
Improved pump ability.
Properties of fresh Self-Compacting Concrete :-
Filling Ability :- Complete filling of formwork and encapsulating
of reinforcement.
Passing Ability :- Passing of obstacles without blocking.
Resistance to Segregation :- Maintaining of homogeneity.
throughout mixing, during
transportation, and casting.
Material used in our project :-
Coarse Aggregate : 20mm (Chikhli) Coarse Aggregate : 10mm (Chikhli) Fine Aggregate : Zone III (Nareshwer, River Narmada) Cement : Ultractech OPC-53 Grade Potable Water Chemical Admixtures
o MASTERPOLYHEED 8980 o MSTERGLENIUM SKY 8784
Mineral Admixtures o Fly ash (Pozzocrete Fly Ash)
Exeperimental work
IS SieveCumulative %
Passing Average- 1 & 2
20 mm 99.85
16 mm 71.91
12.5 mm 19.10
10 mm 0.99
6.3 mm 0.095
Average of C.A 20mm DN :-
6.3 mm 10 mm 12.5 mm 16 mm 20 mm0
20
40
60
80
100
120
IS SIEVE
%PASSING
Average of C.A 10mm DN :-
IS SieveCumulative %
Passing Average- 1 & 2
10 mm 92.44
6.3 mm 33.52
4.75 mm 7.39
2.36 mm 0.33
1.18 mm 0.23
Pan 0.00 pan 1.18 mm
2.36 mm
4.75 mm
6.3 mm 10 mm0
10
20
30
40
50
60
70
80
90
100
IS SIEVE
%PASSING
Gradation Of C.A 20 mm And 10 mm for Mixed Design
Test paramet
er20 mm
Requirement as per IS 383
10 mm
Requirement as per IS 383
IS sieve size % passing
20 99.85 85 – 100 - -
12.5 71.91 - - 100
10.0 19.10 0 – 20 92.44 85 – 100
4.75 0.99 0 – 5 7.39 0 – 20
2.36 0.09 - 0.33 0 – 5 2.36 mm 4.75 mm 10.0 mm 12.5 mm 20 mm0
20
40
60
80
100
12020 mm [DN] 10 mm [DN]
IS SIVES
%PASSING
Average of Fine aggregate :-
SIEVECumulative %
Passing Average- 1 & 2
4.75 mm 95.08
2.36mm 93.13
1.18 mm 87.86
600 micron 62.91
300 micron 4.53
150 micron 0.37
75 micron 0.18
Pan 0.00
pan 75 µ 150 µ
300 µ
600 µ
1.18 mm
2.36 mm
4.75 mm
0
10
20
30
40
50
60
70
80
90
100
SIVES
%PASSING
Mix proportion of concrete :-
For 1m3
Ordinary Concrete SCC -1 SCC - 2 SCC - 3
Cement = 360.000 450.000 425.000 360.000 Kg/m3
Fly ash = 90.000 135.000 160.000 90.000 Kg/m3
Water = 172.000 194.000 194.000 194.000 Kg/m3
Fine aggregate = 608.000 842.000 840.422 840.422 Kg/m3
Coarse aggregate 20mm = 831.000 316.800 316.136 316.136 Kg/m3
Coarse aggregate 10mm = 440.000 241.200 240.714 240.714 Kg/m3
Chemical admixture = 2.250 4.400 4.400 4.400 Kg/m3
NOTE:-o Ordinary concrete mix design as per IS 10262 : 1999o There is no fix method for SCC design mix. o It is only trial and error method for SCC.
Slump test result:-
NOTE:-o Ordinary Concrete slump test as per IS 7320:1974 o There is no IS-code available for self-compacting concrete, so type of
slump is not specified.
OPC SCC0
100200300400500600700800
145 mm
669 mm
Result & analysis
Compressive strength test result:-
7 day 28 day05
101520253035404550
34.7632.47
46.07 47.52
ordinary concrete
SCC
Material cost of concrete :-
Ordinary
Concrete
SCC
Cement 2340 2340Aggregate 20 mm 665 253
Aggregate 10 mm 220 120
Fine aggregate 548 757
Fly ash 450 450Chemical admixture 200 792
TOTAL COST 4423 4712
Oridanary concrete
SCC0
1000
2000
3000
4000
5000
6000
44234712
W/C ratio:- The water–cement ratio is the ratio of the volume of water to the
volume of cement used in a concrete mix. A lower water-cement ratio leads to higher strength and durability. To get flow ability we add much water in concrete so the strength of
concrete is reduced.
Equipment cost :-
ordinary concrete SCC0
500
1000
1500
2000
15001500400
vibration machine rent
Mixture machine rent
Manpower:- Need of man power to laying, finishing, curing of concrete. Labour cost = 325.00 Ordinary concrete labour required = 4 Self-compacting concrete labour required = 2
oridnary concrete SCC0
200
400
600
800
1000
1200
1400 1300
650Manpower cost
Final cost of concrete :-
Ordinary Concrete SCC
Initial cost 4423 4712
Manpower cost 1300 650
Equipment cost 1900 1500
Final cost 7623 6862
Oridanary concrete SCC0
10002000300040005000600070008000 7623
6862
Outer face finish :- Outer face finishing is much batter then ordinary concrete and cracks
are very less compare to ordinary concrete.
ordinary concrete Self-compacting concrete
Reduce construction period Strength
Application of SCC Delhi metro-rail construction :-
Self Compacting Concrete was the cross passage between the main tunnels of the rail network.
LNG TANK, OSAKA GAS COMPANY :-
Self-compacting concrete was used for the wall of a large LNG tank belonging to the osaka gas company, whose concrete casting was completed in june 1998.
The volume of the self-compacting concrete used in the tank amounted to 12,000 m3.
Concrete workers was reduced from 150 to 50. The construction period of the structure decreased from 22 months
to18 months.
AKASHI-KAIKYO BRIDGE ANCHOR :-
A typical application example of self-compacting concrete is the two anchorages of akashi-kaikyo (straits) bridge opened in april 1998, a suspension bridge with the longest span in the world (1,991 meters).
The volume of the cast concrete in the two anchors amounted to 290,000 m3.
200 meter it was transported through the pipes to the casting site. In the final analysis, the use of self-compacting concrete shortened
the anchorage construction period by 20%, from 2.5 to 2 years.
Arlanda Airport Control Tower, Stockholm, Sweden :-
The total height of the tower is 83 m. The structure of the pillar consists of two shafts having different dimensions which are emphasized by two - colour design.
SCC was used in order to achieve the concreting speed of a standard floor height h=3.27m in a 4 day climbing cycle of formwork and to ensue high-quality concrete placing without vibration.
The decreased noise level during concrete placing enabled concreting during the night shift.
Today it represents a symbol of Stockholm.
Conclusion At same grade of concrete we find self-compacting
concrete with certain change as decrease only 10 % of final cost.
Use of self-compacting concrete is very simple and no skilled labour is required.
By practical we concluded self-compacting concrete give us smooth outer surface as plaster so plaster cost is reduced.
By practical we achieved more strength & work-ability so SCC can be used in arid area.
We use fly ash (wastage material) and reduce 15% cement content in concrete.
We will have succeeded in creating durable and reliable concrete structures that require very little maintenance work.
Future Scope Find flexural strength of ordinary concrete & self-compacting
concrete. Test result for Self compacting concrete + rise ash husk. According our test result we can replace ordinary concrete to self-
compacting concrete.
Thank you