Get Full Government Meeting Transcripts, Videos, & Alerts Forever!
Get email alerts on the Pavement Maintenance topic
No spam. Unsubscribe anytime.
Consultant outlines pavement life‑cycle: "You're putting sunscreen on the pavement"
Summary
Consultant Joe Ryrie walked the committee through deterioration curves, explaining crack sealing, slurry and chip seals, and the limits of overlays versus reconstruction. He gave per‑square‑foot and system totals to illustrate when streets need heavier work.
Consultant Joe Ryrie explained why different treatments produce different life‑expectancy gains and why timing matters when choosing maintenance interventions.
Ryrie described a standard deterioration curve and said light treatments (crack seal, slurry) buy years of service but do not restore a pavement to new condition. "You're putting sunscreen on the pavement," he said of slurry seals, adding that rehabilitation rather than repeated overlays is the only way to return a street to a 100 PCI.
He reviewed common treatments: crack sealing (prevents water intrusion), slurry seals (thin wearing surface, protects against UV and traffic), chip seals (heavier sealing for more extensive cracking) and localized dig‑out repairs. Ryrie said a slurry seal may last as little as three years on busy roads and longer on residential streets. He emphasized that an overlay shortens the effective life relative to a full reconstruction because underlying stresses reflect through.
Ryrie and staff discussed a per‑square‑foot approach for Mill Valley rather than a per‑mile average, because street widths and designs vary across the city. He offered rough unit numbers used in the study (maintenance roughly $1/sq ft; rehabilitation about $13/sq ft) and explained that life‑cycle totals depends heavily on whether a street is a brand‑new build versus an overlayed pavement.
