01553172

Component

Roller compacted concrete (RCC) is a relatively stiffer mixture than regular concrete when fresh. Similar to regular concrete, RCC is a mixture of aggregate, cementitious materials and water that is placed using asphalt pavers, compacted by vibratory rollers and hardens into concrete. RCC contains a low amount of water, exhibits no slump, requires asphalt paving equipment for placement rather than expensive slip-form paving equipment, and can be placed and opened to traffic in a short period of time. This paper summarizes a RCC project recently completed by the Virginia Department of Transportation (VDOT) that covers about 134,000 square feet, equivalent to 2-lane miles, at the “Park and Ride” facility in Stafford County, Virginia. About one third of the RCC was used to rehabilitate the existing Staffordboro Boulevard. Batches of the RCC mixture fluctuated in moisture content and sometimes delays in placement occurred that resulted in wet and dry mixtures. The compaction, surface smoothness and the road profile were affected by the fluctuations in moisture content. RCC cylinders prepared using a vibratory hammer usually exceeded compressive strengths of 1,600 psi and 4,000 psi at 12 hours and 28 days, respectively. Only a few early cracks were observed in the pavement. In order to avoid early cracks, joints needed to be cut at least one quarter depth and continuous water curing is essential. Opening to traffic at an early age for a section, within 5 to 6 hours of placement, did not show any visual damage to the pavement; most sections were opened in less than 48 hours. RCC overlaid with 2 in of asphalt is performing well after one severe winter and eight months of traffic.

This paper was sponsored by TRB committee AFH50 Portland Cement Concrete Pavement Construction. Alternate title: Virgina Department of Transportation's First Roller-Compacted Concrete Pavement.

01550057

15-5814

English

16p

2015

Transportation Research Board 94th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Moisture content; Pavement performance; Paving; Roller compacted concrete; Roller compacted concrete pavements

Virginia Department of Transportation

Fredericksburg (Virginia)

Construction; Highways; Materials; I32: Concrete; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2015 Paper #15-5814

TRIS, TRB, ATRI

Dec 30 2014 1:57PM