Author Archives: Jason Reaves

2024 South Dakota Concrete Conference Registration Now Open

Use the link below to see details and register for the 2024 South Dakota Concrete Conference on January 30 & 31 at the Lodge at Deadwood

Register Here

2023 South Dakota Concrete Conference Registration Now Open!

Use the link below to see details and register for the 2023 South Dakota Concrete Conference on February 7 & 8 at the Lodge at Deadwood

Register Here

2023 Annual Concrete Conference

Save the Date!
The 2023 Annual Concrete Conference is back! February 7&8, 2023 at the Lodge at Deadwood.
Registration will be coming soon!

Contact Jason Reaves at SDACPA with any questions (605) 271-3396

Concrete Overlay History on Iowa’s Roadways

As our roadways continue to move towards more of a preservation mode versus new construction or full reconstruction, the concrete pavement industry continues to deliver new research and history on concrete overlays as a preservation method.  A long term preservation method.  Recently the National Concrete Pavement Technology Center at Iowa State University (CP Tech Center) along with the Iowa Department of Transportation and the Iowa Concrete Paving Association partnered to summarize 1,500 miles of roadway.  These concrete overlays have up to 40 years of pavement life to show how overlays on existing pavements can perform to provide a long term preservation to our existing pavements.  The entire document can be found here.  In summary, the document shows that 93% of overlays ranging from ages of 0-37 years were an average to good rating in the International Roughness Index (IRI) and 89% were in good to excellent condition in the Pavement Condition Index (PCI).  These facts and more valuable data can be found in a brief of the entire document on the most recent CP Road Map April 2018 publication.  The MAP brief can be found here.  I encourage you to read either document and consider a concrete overlay for the next pavement preservation project you have in your highway program.  A long term preservation can save your agency a significant amount of money in the long term life of the pavement.

 

Performance Engineered Mixtures (PEM)

At a recent concrete conference a representative from FHWA made a statement that really hit home on why we should be using Performance Engineered Mixtures (PEM).  He stated PEMs are the most significant field-level advancement in 40 years in the concrete pavement industry.  That’s an entire career for many.  That’s my entire lifetime.  The South Dakota Department of Transportation and the South Dakota Chapter of the ACPA have provided funding to be one of the champion states for PEM.  We recognize need for a more durable, long-life concrete pavement is necessary in South Dakota as stresses from the freeze-thaw environment and the de-icers that come along with the environment have created the need for the concrete pavement industry to deter these harsh chemicals.  As a champion state of PEM, the SDDOT has been using PEM for several years now on many concrete pavement projects with much success.  Contractors using the mixes have found them to be a more workable concrete, especially in slip-form paving applications.

Some of the highlights of the SDDOT “Special Provision for Contractor Furnished Mix Design for PCC Pavement” include:

  1. A Quality Control approach allowing the Contractors to be responsible for the performance, production, and composition of their concrete mix designs.
  2. A well graded aggregate gradation in the mix design allowing the mix to be more workable with less paste.
  3. The inclusion of 20% to 25% fly ash in the minimum 575 lb/cy cementitious content in the mix.  Fly ash is proven to mitigate alkali silica reaction (ASR) and deter reactions to deicing chemicals.
  4. Establishing a maximum water/cementitious ratio in the mix.  Lower w/c ratios provide a less permeable concrete providing another mitigation against deicers.

Our concrete pavement specifications have not been keeping pace with advancements in science and innovation within the concrete pavement industry.  These mixes bring us into the 21st century in the industry.  The link below more thoroughly summarizes PEM and their benefits.  If you have any questions regarding implementing these into your concrete pavement project, please contact your local ACPA chapter or the CP Tech Center. 

PEM MAP brief April 2017

 

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