County Roads 27, 140, and 152

Through an on-call geotechnical engineering and materials testing contract, Blackburn Consulting worked on several roadway rehabilitation projects.

 

Our geotechnical services included:

• subsurface investigations,
• laboratory mix design programs,
• pavement design, and
• full depth reclamation with cement (FDR-C) recommendations.

 

During construction, Blackburn’s materials testing services included:

• compaction testing,
• checking of pulverization depth and gradation,
• percent cement added in the field,
• moisture conditioning and compaction,
• laboratory fabricated unconfined compressive strength testing, and
• sampling and testing during hot mix asphalt placement.

 

Because the FDR-C rehabilitation method requires cement-treated soil, all construction testing had to be completed within two hours of sampling. Blackburn immediately transported samples from the project site to our in-house lab to complete testing within the required time frame.

 

Blackburn’s field representatives also performed testing on-site to verify gradation after pulverization. This allowed the contractor to react in real time, make any needed adjustments, and avoid costs associated with later corrections.