Concrete Driveways in Tennessee

Local residential building codes in Tennessee - typically International Residential Code (IRC) 2009 or 2012 - offer little guidance on exterior concrete and do not address the design and construction of concrete driveways. The Tennessee Concrete Association (TCA) recommends that all exterior residential concrete be designed and constructed in accordance with American Concrete Institute Residential Code Requirements for Structural Concrete (ACI 332) and Commentary. This is the ACI’s code for residential concrete and it is referenced in the IRC code.

 

ACI 332-14 Highlights for Tennessee Driveways

Concrete Mix Requirements (from Table 5.3.2): 
• 4000 psi compressive strength (@ 28 days)
• Maximum 4-inch slump +/- 1 inch for purposes of field testing and acceptance o 9-inch slump allowed with High Range Water Reducer (HRWR)
• Air-entrained @ 6% with +/- 1 ½% tolerance (3/4 inch & 1 inch maximum aggregate size)
• Limits on maximum percent of total cementitious material by weight in mix of fly ash or other pozzolan, slag and silica fume are 25%, 50% and 10% respectively.

Concrete Placing Requirements/Recommendations (from Section 6.2 and 10.5)
• Subgrade properly prepared and compacted • Minimum concrete thickness of 3 ½”
• Concrete placed and finished per industry standards
• Concrete unloaded from truck within 90 minutes
• Joints at proper depth and spacing
• Proper curing method immediately applied
• Appropriate measures for cold and hot weather

Homeowner Education

Ready mix producers can supply mixes meeting these requirements and installer training is also readily available in Tennessee. The best avenue for contractors willing to invest the time and effort in learning industry standard practices is the ACI Concrete Flatwork Finisher course, taught regularly by TCA. This course allows contractors meeting the requirements to become certified so that homeowners and contractors can select those contractors who have attained this certification. Another important part of the process is homeowner education. If concrete is not properly maintained or is subjected to harsh de-icing chemicals early in the life of the driveway, even a properly designed and placed concrete mix can be susceptible to unwanted deterioration. Time spent educating the homeowner is time well spent.

Concrete Driveway Care & Maintenance
• Consider application of a penetrating sealer (after curing)
• DO NOT apply salt or de-icers the first winter
• Limit salt & de-icer use and remove excess after use
• Re-apply penetrating sealer periodically

Other Helpful Links:
 

Concrete Finishing (from NRMCA): 
https://www.nrmca.org/aboutconcrete/cips/14pr.pdf

 

Joints in Concrete Slabs on Grade (from NRMCA:)

https://www.nrmca.org/aboutconcrete/cips/06pr.pdf

 

Scaling Concrete Surfaces (from NRMCA):

https://www.nrmca.org/aboutconcrete/cips/02pr.pdf

 

Dusting Concrete Surfaces (from NRMCA):

https://www.nrmca.org/aboutconcrete/cips/01pr.pdf

 

Cracking Concrete Surfaces (from NRMCA):

https://www.nrmca.org/aboutconcrete/cips/04pr.pdf

 

Curing In-Place Concrete (from NRMCA):

https://www.nrmca.org/aboutconcrete/cips/11pr.pdf

 

Plastic Shrinkage Cracking (from NRMCA):

https://www.nrmca.org/aboutconcrete/cips/04pr.pdf

Good Article About Concrete Durability:

The following story used with permission of The American Concrete Institute:

https://www.concrete.org/portals/0/files/pdf/CI4008Prenger.pdf

(Courtesy of the American Concrete Institute, www.concrete.org.)

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