Whole Building Design Guide Federal Green Construction Guide for Specifiers This is a guidance document with sample specification language intended to be inserted into project specifications on this subject as appropriate to the agency s environmental goals Certain provisions where indicated are required for U S federal agency projects Sample specification language is numbered to clearly distinguish it from advisory or discussion material Each sample is preceded by identification of the typical location in a specification section where TM it would appear using the SectionFormat of the Construction Specifications Institute SECTION 03400 PRECAST CONCRETE SPECIFIER NOTE resource management Plant fabrication handles raw materials and by products at a single location that typically allows greater efficiency and better pollution prevention than job site fabrication Aggregates for use in concrete include normal sand and gravel crushed stone expanded clay expanded shale expanded slate pelletized or extruded fly ash expanded slag perlite vermiculite expanded polystyrene beads or processed clay diatomite pumice scoria or tuff Architectural items planters lintels bollards fabricated from lightweight and recycled content aggregates are available The quantity and type of recycled materials vary from manufacturer to manufacturer and include cellulose fiberglass polystyrene and rubber Autoclaved aerated concrete AAC is a type of lightweight precast concrete prevalent in Europe Asia and the Middle East and recently available through manufacturing facilities in the United States It is made with portland cement silica sand or fly ash lime water and aluminum powder or paste The aluminum reacts with the products of hydration to release millions of tiny hydrogen gas bubbles that expand the mix to approximately five times the normal volume When set the AAC is cut into blocks or slabs and steam cured in an autoclave toxicity IEQ Refer to Section 03300 Cast In Place Concrete Precast concrete generally requires less portland cement per volume of concrete for similar performance due to better quality control performance Performance is more predictable in precast operations since more exact dimensions placement of reinforcing and surface finishing can be obtained Precast concrete can be fabricated with continuous insulation AAC is significantly lighter about 1 5th the weight of traditional concrete than normal concrete and can be formed into blocks or panels Lighter weight concretes generally have greater fire and thermal resistance but less strength than traditional normal weight concrete A full range of lightweight concretes are available and their strength and weight is determined by the aggregates used PART 1 GENERAL 1 1 1 2 SUMMARY A This Section includes 1 Autoclaved Aerated Concrete AAC B Related Sections 1 Section 03300 Cast In Place Concrete SUBMITTALS A Product data Unless otherwise indicated submit the following for each type of product provided under work of this Section SPECIFIER NOTE http fedgreenspecs wbdg org 11 02 05 03400 1 Precast Concrete Whole Building Design Guide Federal Green Construction Guide for Specifiers Green building rating systems often include credit for materials of recycled content USGBC LEED v2 2 for example includes credit for materials with recycled content calculated on the basis of preconsumer and post consumer percentage content and it includes credit for use of salvaged recovered materials Green Globes US also provides points for reused building materials and components and for building materials with recycled content 1 Recycled Content a Indicate recycled content indicate percentage of pre consumer and postconsumer recycled content per unit of product b Indicate relative dollar value of recycled content product to total dollar value of product included in project c If recycled content product is part of an assembly indicate the percentage of recycled content product in the assembly by weight d If recycled content product is part of an assembly indicate relative dollar value of recycled content product to total dollar value of assembly SPECIFIER NOTE Specifying local materials may help minimize transportation impacts however it may not have a significant impact on reducing the overall embodied energy of a building material because of efficiencies of scale in some modes of transportation Green building rating systems frequently include credit for local materials Transportation impacts include fossil fuel consumption air pollution and labor USGBC LEED v2 2 includes credits for materials extracted harvested and manufactured within a 500 mile radius from the project site Green Globes US also provides points for materials that are locally manufactured 2 Local Regional Materials a Sourcing location s Indicate location of extraction harvesting and recovery indicate distance between extraction harvesting and recovery and the project site b Manufacturing location s Indicate location of manufacturing facility indicate distance between manufacturing facility and the project site c Product Value Indicate dollar value of product containing local regional materials include materials cost only d Product Component s Value Where product components are sourced or manufactured in separate locations provide location information for each component Indicate the percentage by weight of each component per unit of product B Submit environmental data in accordance with Table 1 of ASTM E2129 for products provided under work of this Section C Documentation of manufacturer s take back program for units full and partial packaging xxxx Include the following 1 Appropriate contact information 2 Overview of procedures a Indicate manufacturer s commitment to reclaim materials for recycling and or reuse 3 Limitations and conditions if any applicable to the project PART 2 PRODUCTS 2 1 MATERIALS A Load bearing and non lad bearing AAC elements Comply with ASTM C1386 http fedgreenspecs wbdg org 11 02 05 03400 2 Precast Concrete Whole Building Design Guide Federal Green Construction Guide for Specifiers PART 3 EXECUTION 3 X SITE ENVIRONMENTAL PROCEDURES A Waste Management As specified in Section 01351 Waste Management and as follows 1 Broken waste AAC units May be used as non structural fill if approved by Architect Engineer 2 Coordinate with manufacturer for take back program Set aside scrap packaging xxxx to be returned to manufacturer for recycling into new product END OF SECTION http fedgreenspecs
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