Guidelines for Greening Your Concrete Specifications
Suggestions for adding green building related requirements to your concrete specifications are noted referencing the appropriate articles and paragraphs within the MASTERSPEC®
section as a guideline.
For information about AIA's MASTERSPEC contact ARCOM at (800) 424-5080 or visit www.arcomnet.com. Manufacturer and product listings are provided as a starting point. Users are encouraged to research products before specifying. GreenSpec, available at buildinggreen.com, provides a current listing of green building products.
SECTION 02751 CEMENT CONCRETE PAVEMENT
Sustainability Issues: When solar radiation is absorbed by a material and transferred back the surrounding atmosphere this is known as heat island effect. Paving materials can have a great effect on ambient air temperature in urban areas compared to suburban or rural areas. Light colored paving material will help reduce the heat island effect.
Concrete mixes can have a high percentage of recycled content in using fly ash to reduce cement use, using recycled aggregates, and using reinforcing steel that has high recycled content.
PART 1 – GENERAL
1.2 – SUMMARY
B. – Related Sections include the following
1. For LEED Projects – see Division 1 Section ‘LEED Requirements Summary’ for recommendations and requirements for recycled content, regional materials, FSC certified formwork, low-emitting concrete finishes and LEED submittal requirements for all concrete materials
A. Cementitious Materials:
Fly Ash and blast-furnace slag are waste products form industrial processes that can be used as a replacement for cement.
D. Recycled content as a percentage of the total weight of the product.
1. Fly ash or slag
3. Reinforcing steel
E. It is possible to use recycled concrete aggregate in some mix designs. The recycled aggregate may come from site demolition or a plant that produces crushed concrete aggregate. However the mix design needs to be carefully evaluated, as recycled aggregates tend to absorb water faster than virgin aggregates because of the presents of old mortar and cement paste. Consider specifying 80% to 100% of recycled coarse aggregate and 10% to 20% for fine aggregate.
H. Forest Stewardship Council (FSC) Chain of Custody documentation for wood formwork
PART 2 – PRODUCTS
2.1 – MANUFACTURERS
Locate manufacturers that are in the local or regional area.
2.2 – FORMS
B. If wood formwork is to be used consider specifying Forest Stewardship Council (FSC) certified wood
D. Many soy based form release agents are available these are non-toxic and bio-degradable.
2.3 – STEEL REINFORCEMENT
A. Typically, steel reinforcement will have a very high post-consumer recycled content
2.4 – CONCRETE MATERIALS
C. – Some Recycled Aggregate Can Meet ASTM C 33
3. Consider using 10% to 20% recycled fine aggregates.
2.5 – RELATED MATERIALS
B. – Color Pigment
Light colored concrete can reduce heat island effect in urban areas. Specify concrete with an emissivity of .9 when tested for ASTM 408 and an initial reflectance of at least .25 when tested for ASTM E903.
2.6 – CONCRETE MIXTURES
A. Concrete mixes using Fly Ash or Slag as a percent of cement reduction and using recycled aggregates from crushed concrete will change the properties of the mix design compared to a conventional mix design. Proper testing and per ASTM standards is advised.
Portland Cement Association ("PCA") is a not-for-profit organization and provides this publication solely for the continuing education of qualified professionals. THIS PUBLICATION SHOULD ONLY BE USED BY QUALIFIED PROFESSIONALS who possess all required license(s), who are competent to evaluate the significance and limitations of the information provided herein, and who accept total responsibility for the application of this information. OTHER READERS SHOULD OBTAIN ASSISTANCE FROM A QUALIFIED PROFESSIONAL BEFORE PROCEEDING.