Green Enduring ConcreteGreen Enduring Concrete
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE
Angus PeruzzoNilotpol Kar
Angus PeruzzoNilotpol Kar
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One of the most important challenges confronting the concrete industry - to meet the housing and infrastructural needs of society in a sustainable manner!
One of the most important challenges confronting the concrete industry - to meet the housing and infrastructural needs of society in a sustainable manner!
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE04/21/23
Chemistry can transform construction industry towards sustainability
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FLIR Systems
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FLIR Systems
Contributes to 30 % ofthe global greenhouse gas
emissions
Displaces the most productive land
Consumes up to 40 % of the
worlds energy
Contributes to loss of biodiversity
and ecosystems
Causes 10% of the world´s
emission of fine dust
Chemical innovations help the construction Industry to become more sustainable with innovative solutions through chemistry
Chemical innovations help the construction Industry to become more sustainable with innovative solutions through chemistry
04/21/23 GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE
Green Enduring Concrete Cases
High Volume SCM concrete
High Strength High Performance Concrete (UHSC)
Low fines self consolidating concrete
High Volume Manufactured Sands
Hydration Controlled Concrete
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE04/21/23
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Case 1: High Volume SCM concretea major hi rise (~ 632 m) in China in a C50R90 mix for foundation works
Challenges:
Tight construction schedule - single pour of ~60,000 m3
Mass concrete application requiring low cement content to control heat of hydration
Application of manufactured sand mandatory due to limited availability of river sand
Achievements:
Completed in 60 hours – 450 trucks, 18 pumps
Concrete temperature < 20oC, with ternary blend
50% manufactured sand with super flow retention upto 90 min
7d 28d 60d 90d
Average (MPa) 39.8 56.9 63.0 66.5
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE
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Case 1 : High Volume SCM concretea major hi rise (~ 632 m) in China in a C50R90 mix for foundation works
VIDEO
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To get wider floor space by downsizing columns
To get no-column living space for flexible interior design
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Large
Case 2 : High Strength High Performance Concrete (UHSC)Achieving higher floor space in high-rise building
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DesignFc
(N/mm2)W/B(%)
unit , (kg/ m3)
flow(cm)
Air content
(%)water binder sand stone
PCE HRWR
fiber
65 1.0 130 18.0 150 834 647 835 12.9 2.5
C130 Concrete Design: (kg/m3)
Source: Kuroiwa et al., Concrete Engineering, Vol. 42, No.10, pp.44-49, 2004/10
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Case 3 : Low fines self consolidating concretee.g. Japan
・ TVC (grade 36-21-20N)Slump - 21.0cmAir – 4.6% (typ in JP)Concrete Temp: 18.0℃
・ TVC (grade 36-21-20N)Slump - 21.0cmAir – 4.6% (typ in JP)Concrete Temp: 18.0℃
・ SDC(grade 36-60-20N)Flow - 61.0cmT50/Tstop 3.0 / 4.7 secAir - 4.8% (typ in JP)Concrete Temp: 18.0℃
・ SDC(grade 36-60-20N)Flow - 61.0cmT50/Tstop 3.0 / 4.7 secAir - 4.8% (typ in JP)Concrete Temp: 18.0℃
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE
Case 3 : Low fines self consolidating concretelowest cementitious content of 300 kg/m3 in NZ
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Case 3 : Low fines self consolidating concrete - Value Proposition:Productivity – efficient resource utilisation and higher output
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Case Study 4 : High Volume Manufactured Sands
Maximise use of unprocessed manufactured sands
Main Issues – “smectite clays”, particles < 150 μ, irregular particle shape, PSD
Polymer modifications have helped:
− Better rheology
− Good water reduction upto 10% for low grade concretes
− Sustainable
WRA mix
RHEOPLUS Mix
Cement 230 230
Coarse Agg 52% 51%
Sand 39% 8%
CRF 9% 41%
WRA 0.45% -
RHEOPLUS - 1.0%
Savings Use of more m-sand
SureTEC® technologyClay increased
Keeps dispersing
Conventional PCE technologyClay increased
Weakening dispersion
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE04/21/23
Case Study 5 : Hydration Control Agents
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The disposal of returned plastic concrete and concrete washwater is an environmental challenge for concrete producers.
It is estimated that approximately 2 to 10 % of all concrete produced is returned for disposal potentially creating unnecessary landfill waste.
With HCAs, producers can control cement hydration to better manage returned plastic concrete and also reduce concrete washwater.
The disposal of returned plastic concrete and concrete washwater is an environmental challenge for concrete producers.
It is estimated that approximately 2 to 10 % of all concrete produced is returned for disposal potentially creating unnecessary landfill waste.
With HCAs, producers can control cement hydration to better manage returned plastic concrete and also reduce concrete washwater.
Why HCA is a sustainable technology
Reduces water needed to clean ready-mix truck drums
Reduces concrete washwater disposal
Reduces the need for disposal of returned plastic concrete
Reduces construction waste
Why HCA is a sustainable technology
Reduces water needed to clean ready-mix truck drums
Reduces concrete washwater disposal
Reduces the need for disposal of returned plastic concrete
Reduces construction waste
How it works
Adsorbs on the surface of cementitious materials
Forms a protective barrier and controls the setting characteristics of concrete
Acts as a dispersant, providing water reduction, enhanced workability, and improved compressive strength
How it works
Adsorbs on the surface of cementitious materials
Forms a protective barrier and controls the setting characteristics of concrete
Acts as a dispersant, providing water reduction, enhanced workability, and improved compressive strength
GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE04/21/23