CALIFORNIA STATE EDITION
A Supplement to:
January 16 2022 Vol. III • No. 2
“The Nation’s Best Read Construction Newspaper… Founded in 1957.” Your California Connection – Sharon Swanson – 1-760-518-4336 – sswanson@cegltd.com
As Pacific Ocean waves crashed in the background under sunny skies, Graniterock crews of Watsonville, Calif., enjoyed a picturesque day of work as they labored on an asphalt recycling pilot project with Caltrans. Graniterock partnered with Caltrans to use cold-in-place recycling to rehabilitate a 10.6-mi. stretch of pavement on scenic Highway 1 between Santa Cruz and Pescadero. The project piloted Cold In-Place Recycling to see how
Chuck MacDonald
CEG CORRESPONDENT
Caltrans and paving companies in the state could continue to refine their recycling practices to benefit California taxpayers and the travelling public. Recycling is common in road building across the nation. Asphalt is the most widely recycled material in the world by a wide margin, commonly called Recycled Asphalt Product (RAP), with concrete being another leader. On conventional “mill and fill” jobs, contractors use an asphalt milling machine to grind the top 3-to-4 in. of asphalt that has deteriorated, load it into a truck, haul it to a landfill or recycle facil-
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ity where it can be processed and incorporated back into hot mix asphalt (HMA). Typical HMA usually incorporates a small percentage of RAP into the new mix, around 15 percent. Concrete is often crushed on site and used as new subgrade or to reinforce the existing subgrade. In both asphalt pavement design and concrete pavement design, Caltrans works diligently with the industry to preserve the state’s limited aggregate resources while simultaneously increasing use see RECYCLE page 8
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