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LYNDON B. JOHNSON FREEWAY

The performance of the EMC SQUARED® System subgrade treatment on the Interstate 635 (LBJ) Freeway project has also proven out the recommendations of the Texas Transportation Institute study. This project (TxDOT CSJ 2374-07-041) involves three lanes in each direction with concrete pavement constructed above a hot mix asphalt base course and stabilized subgrade. These lanes were added as a frontage road system to existing freeway lanes. EMC SQUARED System treatment was used for the majority of the subgrade construction requirements for lane additions on the eastbound freeway, while an asphaltic product was used under the eastbound exit lanes. Cement, lime and fly ash were used in various combinations for subgrade stabilization for the lane additions on the westbound side. Distinct roughness and heaving, or “roller coasters,” as well as pavement cracking soon manifested itself through the pavements in the westbound lanes constructed above the calcium based cement, lime and fly ash stabilizer treatments and these sections required full depth reconstruction within a short period of years. The eastbound exit lanes constructed above the asphaltic stabilizer treatment also developed roughness and cracking and required repairs. At the same time, reports from the Dallas District indicated that the eastbound lanes above the EMC SQUARED subgrade retained overall smoothness with no pavement distress, meeting TxDOT’s “smooth” classification in International Roughness Index (IRI) during annual profilometer testing.

After twelve years in service in soil conditions described as “probably the worst soil we have in the Dallas District,” the pavement in the eastbound lanes above the EMC SQUARED subgrade has “some full depth repairs but not nearly as much as the westbound frontage road.” Describing those repairs, which have amounted to almost rebuilding the entire roadway, “they are extensive”. The pavements above the asphaltic treatment have now had numerous full depth repairs and are approaching the stage where this entire section of roadway will need to be replaced.

 

Soil Stabilization Products, Inc.
PO Box 2779
Merced, CA 95344

Toll Free: (800) 523-9992
Phone:     (209) 383-3296

Fax: (209) 383-7849

Email: INFO@SSPCO.COM

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