Our Steel Solutions for your Green Building

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Steel Solutionsfor Green Building

As society makes determinedmoves towards sustainability,construction has a veryimportant role to play withinthis agenda, not only becauseof its economic and socialcontribution, but also becauseof its impact on the quality ofour lives. While the buildingindustry provides 5% to 10%of worldwide employmentand generates 5% to 15% ofthe GDP, the built environmentaccounts for 40% of energyconsumption, 40% of CO2emissions, 30% of theconsumption of naturalresources, 30% of wastegeneration and 20% of waterconsumption.

The future global challenge for the construction industry is clearly to meet the world’sgrowing needs while at thesame time limiting the impactof its burdens by drasticimprovement of its activities.

In construction, steel hasdeveloped as a material ofchoice and offers a wide rangeof solutions that can makebuildings more energy efficient,less costly to operate andmore comfortable.

We in ArcelorMittal believestrongly in steel’s valuesfor Green Building and arecommitted to helping deliverthe benefits that our solutionsbring to our customers, theirbuildings and their owners.

Steel Solutionsfor lower environmental impact

Recycling

Electric Process

Sheets, coils, coated and other finished products.

Sheet piles, beams, sections, rounds, rods, and bars.

Steel products for construction

Iron ore - Mining

Smelting ProcessUse of Steel Products

50 - 100 YEARS

Reuse

1.2 tonnes of steel recycled by ArcelorMittal each second

The Steel Recycling Loop

A high degree ofprefabrication for fast,reliable and predictableconstructionThe advantages of the dry steel construction system

Use of prefabricated elements providesa large range of benefits that contributeto reduce the risks during the constructionphase: using steel construction techniquesreduces environmental impacts andneighbourhood nuisance on theconstruction site.

Water use, waste generation, dust emission,traffic and noise are considerably lowerthan in traditional construction.Work site management is largely facilitated.All these advantages are especiallyappreciable in congested urban areas.

A huge decrease inenvironmental impact in the manufacturingprocess

A lot of progress has been made by ArcelorMittal over time.Waste generation, water use and airemissions are continually decreasing,as are energy consumption andgreenhouse gas emissions.

In Europe, CO2 emissions and energyconsumption per tonne have beenreduced by 20% over the 20 last years.By year end 2007, 80% of ArcelorMittalproduction sites had attained ISO 14001certification, the international standardfor environmental management systems.

Steel: the most recycledmaterial in the world

Steel is 100% and indefinitely recyclable,without any quality loss. When recovered,it is 100% recycled.Its recycling rate (i.e. the percentage of materials being taken out of service,recovered and reused) is high but variesfrom product to product.In construction, it reaches particularly high levels: 98% for beams, 65-70% for reinforcement bars.

Recycled steel represents 40% of the steel industry ferrous resource in the world. With almost 40 million tonnesused in 2007, ArcelorMittal is the world’slargest scrap recycler.

HISTAR® performance compared with other steel grades - Use in heavy columns

High strength steels

ArcelorMittal new high-strength steels (HSS) developed for the construction market are contributingto a major reduction in greenhouse gases by making it possible to use lighter structures.

Substituting HISTAR® for merchant steel achieves weight reductions of 32% in steel columns and 19% in beams.

The 50,000 tons of HISTAR® produced in 2007 by ArcelorMittal represents a saving of 14,000 tonnes of CO2, which roughly equates to the annual emissions of 4,000 vehicles.

Steel’s high strength toweight ratio for conservationof natural resources

Thanks to steel’s high strength to weightratio, steel construction requires lessmaterial than traditional constructiontechnologies and contributes to reducinga building’s environmental impact.

Resultant conservation of naturalresources could be from 30% up to 70%.It is possible to achieve further savings by using high strength steels in place of merchant steels.

160 % 156 %

S 235 JR HD 400 x 1086

25254

S 355 JR HD 400 x 677

24580

HIST AR 460 HD 400 x 463

25156

Steel gradeSection

Ultimate load (kN)

68 % 70 %

100 %

Relative weight

Relative material costs

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One example of extensiveuse of HISTAR® steels: The Emirates Tower in Dubai.

Up to 30% reduction of CO2 emissions duringconstruction.

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Velodrome, Berlin - Architect: Dominique Perrault

Steel Solutionsfor energy-efficient buildings

Steel external cladding systems

Thermal & acoustic insulation

Plaster board interior walls

Suspended ceiling

Thermally efficient buildings

A high proportion of energy use is devoted toheat control, by artificially heating or coolingthe building: good steel-based design or useof appropriate steel products can achieve amajor reduction in this energy consumption.

• The combination of steel structure witheffective external insulation drasticallyreduces a building’s losses.

• Double skin systems and/or sandwichpanels provide a thermally efficientenvelope, matching latest energy standards.

• No thermal bridges due to approveddesign.

• Airtightness of steel cladding or roofingsystems eliminates air leakage thatcontributes to energy waste.

More than 80% ofthe energy consumedduring the use phase

In a building, the operational energyconsumption (due to heating, air conditioning, but also lighting etc…)largely outweighs its embodied energy(the energy used to build it).By proposing technical solutions toreduce the energy consumed duringthe whole life of a building, ArcelorMittalis contributing positively to the reductionof its environmental impact.

In order to address global warming issues as well as economicconsiderations, the management of rising energy consumptionis an operational imperative: steel solutions can help achievethis and even have a key role to play in the move towardszero energy buildings.

Floor 15%

Roofing 20%

Windows 15%Wall 35%

Draughts 15%

Manufacturing, transport and construction 12%

Operational energy 84%

Maintenance and renovation 4%

Life Cycle Energy Use in a Building(source EEB)

Energy losses in a building

Thermally efficient steel system High insulation panels (mineral wool)

• Intelligent use of the thermal mass effectof steel products or components enablesenergy savings.

• The large range of colours or finishes oforganic, metallic or even radiative coatingsis suited to all existing climate models.

mineral wool

steel panel

Sunscreen and green roofsystems

Efficient use of steel sunbreakers protectsfrom the sun and helps to reduce solarheat entering a building. It allowssubstantial energy savings by limitingor even eliminating the requirementfor air conditioning.Green roof provides various benefits, such as longer roof membrane life,acoustic insulation, but it also increasesenergy efficiency. In the summer, green roof planting shades the buildingfrom solar radiation and reduces if not

eliminates any heat gain. In the winter,the additional insulation helps to decreasethe amount of energy required to heatthe building.

Renewable energygeneration systems

Besides providing thermally efficientsolutions, ArcelorMittal has developeda complete range of products capable ofproducing energy, such as solar absorbersfor hot water production, or photovoltaiccell systems for electricity generation.

GlobalRoof Hacierco:the green roof solution

Helice: from ArcelorMittal’s Sunstyl range of solutions for summer comfort

Arsolar® Photovoltaic System30 - 35 m2 of roofing produce 4,000 kWh per year

Arsolar® Photovoltaic System

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Steel Solutionsfor high building values

Steel’s inherent mechanical properties (particularly its high strength-to-weight ratio) enable the creation of lightweight load-bearing structures,thus gaining additional usable and efficient space, and bringing higher economic and social value to the building.

Increasing and optimisingspaces

Long-spans and column-free areas

The use of long-span sections for the building’sstructure creates large, open and flexible spaces. Using steel columns instead of concrete onescould deliver around 40 square metres ofadditional floor area on 1000 square metreoffice floor plates. Thin floor systems allowappreciable gains in vertical space.

Angelina™ beam

Sleek, open, transparent and flexible, the Angelina™beam offers a new architectural dimension within an environmentally friendly approach.

Integration of technical components

The shape and design of steel components makes it possible to integrate a building’s technicalservices into ceilings, flooring or partitioning.It enables reduction of the storey height andconsequent savings in weight and material, orincreasing the lettable area by adding extra floors.

Integrated heated floor

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Fast and easy renovation

By providing prefabricated, lightweight andfast to erect components, steel constructionis well placed to facilitate rehabilitation andto update buildings to evolving constructionstandards. Overcladding and over-roofingare particularly efficient solutions togive a second life to a building by improvingthermal performance as well as envelopeaesthetics.

Flexible internal spaces

A column and beam structure creates more efficient and usable spaces, which can be reconfigured to adapt to user’s requirements over time.It makes it easy to redesign volumes by using relocatable steel partitions.

Extension

Often associated with envelope retrofitting,building extensions provide new habitablespaces and new facilities. Steel constructionenables horizontal extension (balcony,terrace) and is fast becoming the only viable solution for vertical extension,thanks to the lightness of steel.

Sustainability also means the ability to accommodate changedrequirements and to take up the challenge of time. A steelbuilding characterized by the absence of load bearing wall is intrinsically more versatile and flexible than other structures.

Kranspoor: reutilisation of a old concrete craneway for a new innovative steel framed office building - MIPIM green building Award

Dusseldorf: rooftop extension of a historical brick building

Enlarging the National Art Museum Reina Sofia, by addition of a steel building that complements the classic traditional style original museum

Hairenov

A innovative renovation process whichallows complete renovation of a roofwithout interfering with the activitytaking place in the building.

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Efficient Steel Solutionsat each stage of a building’s life

When evaluating the sustainability of a building, the life cycle approach is required,taking into account all phases of a building’s life, including materials production,transportation to the construction site, the construction operation itself, operationaluse of the building, demolition or deconstruction, and end of life.

Steel Material

• 40% of resources come from recycling:raw material and energy savings

• Manufacturing process with controlledenvironmental impact (-20% in CO2

emissions and energy consumptionover 20 years, low waste generation)

• Steel is environmentally inert• Material durability• High recycling rate

Construction Phase

• Prefabrication/offsite manufacture:quality controlled, construction siteoptimisation (reduced lead times,transportation and neighbourhoodnuisance), enhanced safety, easeof deconstruction

• “Dry” system: reduced environmentalimpact of the construction site

End of Life

• Easy dismantling• Reusability• Recyclability: 100% and indefinitely

recyclable without quality loss,high recycling rate

Environmental advantages of steel construction

Design and Service Life

• Weight reduction of structure, reduced consumptionof materials and conservation of natural resources(from 30 % to 70 %), possible use of sites with lowloadbearing capacity

• Thermally efficient steel solutions: reduction ofenergy consumption in service

• Simple incorporation of renewable energy generationsystems: very low consumption, or even positiveenergy buildings

• Long spans: creation of versatile spaces, capable of change over time and adaptation to usersrequirements; comfort and well being

• Prefabricated systems and components: easeof maintenance, extensions/modifications possible,flexibility

• Excellent acoustic insulation of steel solutions• Longevity and robustness of steel components

■ Building Materials■ Construction Sites■ Building Life and Deconstruction

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ArcelorMittalBuilding and Construction SupportHead Office

24-26 Boulevard d'AvranchesL-1160 LuxembourgTel: + 352 4792 2233Fax: + 352 4792 2502

ArcelorMittalBuilding and Construction SupportSustainable Construction

5, rue Luigi CherubiniF-93212 La Plaine St DenisTel: +33 (0)1 71 92 16 90Fax: +33 (0)1 71 92 24 97

www.arcelormittal.comwww.constructalia.com

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