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

GREEN ENDURING CONCRETE_CMIC 2012_MELBOURNE04/21/23

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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