Smart Dynamic Concrete and its...
Transcript of Smart Dynamic Concrete and its...
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Smart Dynamic Concrete
and its Applications
Bruno D’Souza
Sustainability in Concrete Technology and Construction
Surabaya,
18 September 2013
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The two extremes……
High stability (+)
Difficult to place (-)
Dependent on human skill for compaction (-)
Highly flowable (+)
Easy to place (+)
Increased binder (-)
High strengths (+/-)
Normal or Traditional Vibrated Concrete
(TVC)
Self-Consolidating Concrete
(SCC)
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Everyday Concrete = Grades C20 to C35
0
10
20
30
40
50
RM
C V
olu
me
(%
of
ov
era
ll)
<C20 C20-C30 C30-C40 C40-C50 >C50
Ready Mix Concrete
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What is Smart Dynamic Concrete (SDC) ?
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Fits between TVC and SCC
Contains less binder but exhibits SCC properties
Everyday concrete made Extraordinary
Flowable for grades M20 – M40
Placed with no vibration
Faster completion of projects
Overall savings in Construction
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How does it look ? Comparison between SCC & SDC
SCC
450Kg/m3 of
cementitious
content
SDC 1
380Kg/m3 of
cementitious
content
SDC 2
350Kg/m3 of
cementitious
content
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Shanghai Tower, China
World’s Second Tallest Building
Architectural height 632 m
Occupied height: 556.7m
Floors above ground 121
Floors below ground 5
Number of elevators 106
World’s fastest elevator 1080m/min
Sustainability
• LEED Gold certification
• China Green Building Three Star rating
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Smart Dynamic Concrete in China 7
Ambient temperature: 8~15 ℃
Raft foundation diameter = 120 m & depth = 6 m
450 agitator trucks, 18 pumps, 6 + 1 RMC plants
Mix design C50 grade concrete
Water
Kg/m3
Cement
Kg/m3
Slag
Kg/m3
Fly ash
Kg/m3
Sand
Kg/m3
Stone
Kg/m3
Dosage
%
160 240 120 80 760 1000 0.9%
Admixture: Rheoplus 325 SDC
Mixing time: 45s
Fresh concrete properties
Initial slump (flow):220mm/550mm
Flow on site after 2hours: >500mm
Shanghai Tower
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16/08/2011 8
SDC - WALLS
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Slums in India, housing shortages
DD.MM.YYYY 9
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Modular formwork prepared for SDC
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SDC – no plastering before painting
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Slum Clearance Board project , Bangalore
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Mix Design for SDC in Bangalore
M20 grade concrete
Binder Content
Agg. Content
Admixture Admix
% Slump flow
Comp Strengths
3D 7D 28D
360 Kgs 1700 MasterGlenium
SKY 6100 0.8% 600 mm 15 20 35
Binder = Portland Cement with 50% GGBFS
Water/Binder ratio = 0.47
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Rajiv Gandhi Rural Housing project, India
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Completed in 6 days !!!
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Long Distance Pumping
Chuzachen in Sikkim, Hydro Power Project
Pumping distance = 2.4 km and down hill (gradient 1: 32)
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Precast Concrete
Box Culverts
Septic Tanks
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Benefits of SDC
1. Reduction in construction time by 50%
2. Reduction in machinery & fuel costs for vibration
3. Reduction in cost due to repairs
4. Easy placement with no compaction
5. Good surface finish / plastering avoided
6. Reduction in labour costs
7. Overall reduction in cost of the structure
8. Enhanced durability and service life of structure
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Summary of the Innovation
Technology
• Robust mix design
• Tailor-made HRWR
• Unique VMA
Features
• Uses less Binder
• 20 - 40 MPa strength
• 50-70 cm slump flow
Benefits
Economics
Ecology
Ergonomics
Smart Dynamic Concrete
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