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Full-Depth Reclamation Pavement Rehabilitation Method existing asphalt, CABC and a pre-determined depth of the subgrade soils are uniformly pulverized.

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Presentation on theme: "Full-Depth Reclamation Pavement Rehabilitation Method existing asphalt, CABC and a pre-determined depth of the subgrade soils are uniformly pulverized."— Presentation transcript:

1 Full-Depth Reclamation Pavement Rehabilitation Method existing asphalt, CABC and a pre-determined depth of the subgrade soils are uniformly pulverized and blended Chemical additive (cement) and water are added, material is mixed and compacted Reclaimed material acts as a new base material for the placement of a new asphalt course

2 Full-Depth Reclamation Referenced by NCDOT Section 541 Flexible Pavement Reclamation Using Portland Cement - on NCDOT Geotechnical Engineering Unit website geotech/supportserv/geopavement/ Then choose FDRwithcement.pdf

3 Full-Depth Reclamation Recently Performed for 2 S&ME Projects Trinity Industrial Park Roadways (documented with photos herein) Forsyth Technical Community College Greene Hall Parking Lot

4 Trinity Industrial Park Roadway Prior to Improvement – Subjected to Relatively Heavy Truck Traffic Volume

5 Full-Depth Reclamation Asphalt pavement had moderate to severe distress with cracking, potholes, and rutting 14 cores encountered 1.25 to 3.25 asphalt and 2.25 to 9.75 of aggregate base course Borings encountered variably compacted, high plasticity clay fill to depths of 2 to 4.5 feet Trinity Industrial Park Roadway Prior to Improvement – Subjected to Relatively Heavy Truck Traffic Volume

6 Full-Depth Reclamation Trinity Industrial Park Roadways Obtained bulk sample of asphalt, base course, soils and performed LABORATORY MIX DESIGN Mix design for cement contents of 3%, 6% and 9% by weight Performed standard Proctor test for each cement content Compressive strength specimen were molded at each cement content – compressive strength testing performed A target compressive strength between 300 and 400 psi is recommended by research and industry literature for the reclaimed materials Laboratory test results indicated a compressive strength of 350 psi for approx. 6.5% cement by weight

7 Full-Depth Reclamation Trinity Industrial Park Roadways New pavement section – 4 inches asphalt / 12 inches of reclaimed material was recommended as option to conventional remove/replace Full-Depth Reclamation was bid as well as conventional remove/replace pavement construction Full-Depth Reclamation was lowest cost

8 Trinity Industrial Park Roadways Cement placed on existing asphalt

9 Trinity Industrial Park Roadways Materials Pulverized & Mixed - 12 inches deep

10 Trinity Industrial Park Roadways After Dry Mixing

11 Trinity Industrial Park Roadways Adding Water & Mixing Again

12 Trinity Industrial Park Roadways Adding Water & Mixing Again

13 Trinity Industrial Park Roadways Reclaimed material was compacted and then proofrolled prior to placement of new asphalt Reclaimed material was stable during proofroll evaluation No undercutting was necessary prior to, during, or after FDR was performed

14 Trinity Industrial Park Roadways

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