warm mix casselberry comp

Warm Mix Asphalt:

The City of Casselberry’s

Experience with WMAKelly H. Brock, Ph.D., P.E., LEED AP, ENV

SPAssistant Public Works Director/City

EngineerCity of Casselberry, FL

APWA Florida Chapter Conference and Exposition - April 20, 2016

City of Casselberry Characteristics

“Crossroads” of SR 436 and US 17-92

Approximately 7.5 square miles

Mostly “built out” suburban/urban environment

Approximately 63 miles of City public roads

Until 2009 lack of a systematic pavement management program

Pavement Management 2009: completed

PASER evaluation

Pavement Management 2009: completed

PASER evaluation 2011: took out

$5.3M construction loan for Neighborhood Improvement Program & applied for TIGER grant

Pavement Management 2013: Developed

mandatory WMA Specification & completed first major road rehab project with WMA (“Area 1-3”)

Pavement Management 2014-15:

Completed 2nd major rehab project with WMA (“Area 4-7”)

2015: Sales tax into effect

2016: Pavement Management Plan formalized in draft Multimodal Transportation Master Plan (includes WMA)

Warm Mix Asphalt 2013-2016: 15

miles /20,708 tons of WMA used

By 2025: 24 miles/33,784 tons of WMA

Projects to date have used WMA Type SP 9.5 Level B (w/ Evotherm)

“Typical” resurfacing thickness of 1.5”

Warm Mix Asphalt Contractor

feedback Pros

Workability (especially winter – highly recommended)

Finer SP 9.5 vs 12.5 produces nicer quality/look (when 1.5” total thickness)

Warm Mix Asphalt Contractor feedback

Cons Can be too

workable in summer (adapt to timing/temperature, especially for curves/radii)

Warm Mix Asphalt Contractor feedback

Prefer Evotherm over water-injected (but Evotherm does require storage and extra cost)

Plant costs about the same in isolated batches (but if everyone used WMA electricity cost would go down)

Warm Mix Asphalt City of

Casselberry observations Quality

surface Reasonable

cost Estimated CO2

savings 9.4 tons/yr 2013-2025

Longevity advantage over HMA: TBD

Questions?

Contact Information

Kelly Brock, Ph.D., P.E., Assistant Public Works Director/City Engineer kbrock@casselberry.org (407) 262 7725 ext 1235 www.casselberry.org/go