RAS PROJECTS THE GOOD, THE BAD, AND THE UGLY. Ryan Barborak, P.E. CST Flexible Pavements Branch

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1 RAS PROJECTS THE GOOD, THE BAD, AND THE UGLY Ryan Barborak, P.E. CST Flexible Pavements Branch

2 The Good, The Bad and The Ugly Every gun makes its own tune. 2

Rand Presentation Do something useful with your RAS Dale Rand

3 The Good Quotes No really guys, RAS is the best thing since sliced bread General Lee Save your RAS, it s good for the environment Dale Rand Presentation Do something useful with your RAS Dale Rand Presentation You bet your RAS you can save a lot of money Dale Rand Presentation 3

4 The Bad Quotes Get your RAS out of here (surface mix) Dale Rand Presentation With enough RAS in this baby, we can make black concrete. Dale Rand Presentation We love RAS Crack seal guys 4

5 The Ugly Quotes RAS is a four letter word Various We smile every time RAS is used Concrete Industry 5

6 We should treat our roads as assets, not consumables that can be used up, thrown away and replaced with new ones. - Don Brock, Astec Industries And use all viable materials to maintain our assets when possible.

7 Why is RAS so Desirable? Granular/aggregate Waterproofing asphalt Base (fiberglass or organic felt) Waterproofing asphalt Back surfacing Component Organic Felt Fiberglass Mat Asphalt cement 30-36% 19-22% Felt (Fiber) 2-15% 2-15% Mineral aggregate (#30) 20-38% 20-38% Mineral filler/stabilizer 8-40% 8-40%

8 Comparison with RAP Asphalt 5.0% Fibers 2.5% Asphalt 24% Coarse Agg. 60.0% Fine Agg. 35.0% Fine Agg. 72.5% RAP RAS

9 Prices Material Cost Per Ton Notes Aggregate $25 PG $732 PG $678 PG $583 RAP $20 RAS $25 RAS (Asphalt) $125 * Source: Louisiana Asphalt Pavement Association Includes processing (freight may not be included) *Based on October 2014 Index (freight not included) *Based on October 2014 Index (freight not included) *Based on October 2014 Index (freight not included) Contains 5% AC (includes processing, may not include freight) Contains 20% AC (includes processing, may not include freight) Assuming 20% AC (includes processing, may not include freight) 9

10 Districts That Have Used RAS to Date in Mixes AMARILLO CHILDRESS LUBBOCK WICHITA FALLS PARIS ABILENE FORT WORTH DALLAS ATLANTA EL PASO ODESSA SAN ANGELO BROWNWOOD WACO TYLER LUFKIN BRYAN AUSTIN BEAUMONT SAN ANTONIO YOAKUM HOUSTON LAREDO CORPUS CHRISTI PHARR 10

11 Districts That Currently Allow RAS Without Restrictions In Surface Mixes AMARILLO CHILDRESS LUBBOCK WICHITA FALLS PARIS ABILENE FORT WORTH DALLAS ATLANTA EL PASO ODESSA SAN ANGELO BROWNWOOD WACO TYLER LUFKIN BRYAN AUSTIN BEAUMONT SAN ANTONIO YOAKUM HOUSTON LAREDO CORPUS CHRISTI PHARR 11

12 Districts That Currently Allow RAS Without Restrictions In Surface Mixes AMARILLO CHILDRESS LUBBOCK WICHITA FALLS PARIS ABILENE FORT WORTH DALLAS ATLANTA EL PASO ODESSA SAN ANGELO BROWNWOOD WACO TYLER LUFKIN BRYAN AUSTIN BEAUMONT SAN ANTONIO YOAKUM HOUSTON LAREDO CORPUS CHRISTI PHARR 12

13 Districts That Currently Allow RAS In Sub-surface Mixes AMARILLO CHILDRESS LUBBOCK WICHITA FALLS PARIS ABILENE FORT WORTH DALLAS ATLANTA EL PASO ODESSA SAN ANGELO BROWNWOOD WACO TYLER LUFKIN BRYAN AUSTIN BEAUMONT SAN ANTONIO YOAKUM HOUSTON LAREDO CORPUS CHRISTI PHARR 13

14 RAS Usage FY 2013 to FY 2014 FY 2013 FY 2014 Seal Coat (SY) 112,957, ,911,803 Mix Tonnage (tons) 7,581,968 8,086,538 Dense Graded (%) Superpave (%) SMA (%) PFC (%) TOM (Item 347) (%) Bonded (Item 348) (%) RAP (%) RAS (%) WMA (%)

15 Comprehensive RAS Survey and Evaluation What is the performance of RAS? CST is currently conducting an evaluation to determine the performance of HMA containing RAS. 15

16 Project Locations by District AMARILLO CHILDRESS LUBBOCK WICHITA FALLS PARIS ABILENE FORT WORTH DALLAS ATLANTA EL PASO ODESSA SAN ANGELO BROWNWOOD WACO TYLER LUFKIN BRYAN AUSTIN BEAUMONT SAN ANTONIO YOAKUM HOUSTON LAREDO CORPUS CHRISTI PHARR 16

17 Number of Projects in Each District District Projects Atlanta 17 Austin 60 Brownwood 5 Bryan 58 Childress 10 Dallas 46 Fort Worth 93 Laredo 9 Lufkin 18 Paris 36 San Antonio 19 Tyler 16 Waco 15 Yoakum 2 Total

18 The Big Picture Plan to evaluate 8-10 projects per district First round to look at around 75 projects Will evaluate more if needed Able to look at a combination of materials Virgin only RAP only RAS only RAP and RAS RAS taken out of the mix during construction Evaluate (other factors) Pavement Design Mix Design Construction 18

CSJ: 0252-01-069 Highway: US 281 District/County: Austin/Burnet Project Complete Date: N/A (Let 8/10/2010) Mix Info: RAS: 5% RAP: 15% Virgin AC: N/A Total AC: 5.

from median (lighter color), outside, and inside lane (lanes darker) - Amount of polished aggregate: low COMMENTS: - Mix looks good (between large repaired strips

19 CSJ: Highway: US 281 District/County: Austin/Burnet Project Complete Date: N/A (Let 8/10/2010) Mix Info: RAS: 5% RAP: 15% Virgin AC: N/A Total AC: 5.2% Mix Type: D-GR HMA TY-C Original Binder Grade: PG SAC: B DISTRESSES: - Cracking: none - Raveling: none - Flushing: none - Rutting: none - Color: different from median (lighter color), outside, and inside lane (lanes darker) - Amount of polished aggregate: low COMMENTS: - Mix looks good (between large repaired strips of highway) - Outside lane was overlaid (patch) at the end of project (Houston Street) - Good ride - Overlapping joints (common for larger aggregate such as B or C mix) 19

20 Austin District Evaluated 9 projects One project was overlaid One was unclear where Section 1 ended and Section 2 began Highway RAS % RAP % Overall Grade US Good US Good FM Not Acceptable RM Acceptable SH Good SH Acceptable FM Acceptable 20

21 The Good 21

22 The Bad (Acceptable) 22

23 The Ugly (Not Acceptable) 23

24 Challenges Difficult to determine section locations especially if changes to the mixture design were made during construction Need district input Define failure Is one crack considered a failure? We are currently proposing three categories Good Acceptable Not Acceptable Some sections have already been overlaid Why? So far, not enough data to draw any conclusions 24

SH 31 - Layout of 5 test sections Section 1:

Evoflex Section 5: Control mix with ERA Tyler

25 SH 31 - Layout of 5 test sections Section 1: Virgin mix with PG70-22 Section 2: Control mix (PG64-22/10% RAP/5% RAS) Section 3: Control mix with Hydrogreen Section 4: Control mix with Evoflex Section 5: Control mix with ERA Tyler District/Athens AO Sections Placed June 2014 Finished surface

26 Performance Properties for SH 31 Mixes Rejuvenated recycled mixes can have similar or even better engineering properties than virgin mixes. Perhaps rejuvenators are the key to RAS performance.

27 Questions? 27

15,790. Bryan Waco Region. Do you own or lease a personal vehicle? What is your primary means of transportation?

15,790. Bryan Waco Region. Do you own or lease a personal vehicle? What is your primary means of transportation? Bryan Waco Region 1 Houston 2 Dallas 3 Fort Worth 4 San Antonio 5 Austin 6 Laredo Pharr 7 Corpus Christi Yoakum 8 Bryan Waco 9 Atlanta Beaumont Lufkin Paris Tyler 10 Amarillo Childress Lubbock Wichita