Presentation delivered March 4, 2015 by Amir Ghavibazoo, Ph.D., at the California Asphalt Pavement Association joint Los Angeles-High Desert Technical Committee meeting in Fontana.
Presentation on a proposed 'Superpave' specification for low-volume traffic routes in California. Presentation delivered during the CalAPA Fall Asphalt Pavement Conference Oct. 26-27, 2016 in Sacramento, Calif.
Presentation by Jack Van Kir,, Director of Asphalt Technology, George Reed Inc. on best practices for Rubberized Hot Mix Asphalt (RHMA) Mix Design. Presentation delivered during the CalAPA Fall Asphalt Pavement Conference Oct. 26-27, 2016 in Sacramento, Calif.
Presentation by Edgard Hitti with Alon Asphalt Company titled "Terminal Blend Rubber Bitumen" at the California Asphalt Pavement Association San Diego Technical Committee Meeting Jan. 28, 2015 in the City of Carlsbad.
Erik Updyke with the Los Angeles County Department of Public Works, and a member of the Greenbook Committee, gives an update at the CalAPA Spring Conference & Equipment Expo April 12-13, 2017 in Ontario, Calif. The topic is on the latest update of the Greenbook specification book for public works agencies in California.
Presentation delivered March 4, 2015 by Amir Ghavibazoo, Ph.D., at the California Asphalt Pavement Association joint Los Angeles-High Desert Technical Committee meeting in Fontana.
Presentation on a proposed 'Superpave' specification for low-volume traffic routes in California. Presentation delivered during the CalAPA Fall Asphalt Pavement Conference Oct. 26-27, 2016 in Sacramento, Calif.
Presentation by Jack Van Kir,, Director of Asphalt Technology, George Reed Inc. on best practices for Rubberized Hot Mix Asphalt (RHMA) Mix Design. Presentation delivered during the CalAPA Fall Asphalt Pavement Conference Oct. 26-27, 2016 in Sacramento, Calif.
Presentation by Edgard Hitti with Alon Asphalt Company titled "Terminal Blend Rubber Bitumen" at the California Asphalt Pavement Association San Diego Technical Committee Meeting Jan. 28, 2015 in the City of Carlsbad.
Erik Updyke with the Los Angeles County Department of Public Works, and a member of the Greenbook Committee, gives an update at the CalAPA Spring Conference & Equipment Expo April 12-13, 2017 in Ontario, Calif. The topic is on the latest update of the Greenbook specification book for public works agencies in California.
Presentation by Dr. John Harvey, University of California Pavement Research Center, Davis & Berkeley, on Pavement Research and Practical Applications. Presentation delivered during the CalAPA Fall Asphalt Pavement Conference Oct. 26-27, 2016 in Sacramento, Calif.
Crumb Rubber Modified Bitumen (CRMB) is hydrocarbon binder obtained through physical and chemical interaction of crumb rubber (produced by recycling of used tyres) with bitumen and some specific additives.
Richard Steger, Platform Manger-Rehab, Ingevity, delivers a technical presentation on blanaced mix design and cracking test, addressing high-recycle content asphalt mixtures at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.
Presentation by Maged Armanuse, Branch Chief, METS, California Department of Transportation (Caltrans), on recent revisions to the HWTT (AASHTO T324) test. Presentation delivered on Nov. 6, 2019 at the California Asphalt Pavement Association Fall Asphalt Pavement Conference in Sacramento, Calif.
Presentation by Edgard Hitti on "High RAP Proposed NSSP in California" for the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 20-21, 2016, in Ontario, CA.
Brandon Milar, P.E., Director of Technical Services for CalAPA, delivers a technical presentation on Warm Mix Asphalt standards and technology at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.
Cold Mix Asphalt Technology (DPWH Item 308 & 304-A) is a cost effective material and better alternative to existing gravel roads (Barangay & Farm-to-Market Roads) in the countryside and also for preventive maintenance of existing paved roads.
Richard Steger with Ingevity gives a technical presentation on balanced mix design and the development of a pavement cracking test at the CalAPA Spring Conference & Equipment Expo April 12-13, 2017 in Ontario, Calif.
Evaluation on Low Temperature Performance of Recycled Asphalt Mixture Using W...IJERA Editor
In this paper, the basic idea is about the recycled technology of asphalt mixture, more in-depth study of the low-temperature performance of warm mix asphalt(WMA).First of all, Including the evaluation of low temperature performance of WMA made of reclaimed asphalt pavement (RAP) (passed and not passed 2.36mm screen), and the influence of WMA with RAP mixed of different dosage of dispersant. Then, using the SBS modified asphalt and base asphalt were test at low temperature, research on the influence of different type of asphalt to the low temperature performance of WMA.
Hear about the latest research the UCPRC is conducting into asphalt pavements for Caltrans, the Federal Highway Administration, the Federal Aviation Administration and others, as well as highlighting the evaluation of long-life (perpetual) asphalt pavement projects in California designed to last 40 years or more with minimal maintenance.
Overview of laydown considerations of Rubberized Hot Mix Asphalt. Delivered at the California Asphalt Pavement Association "Where the Rubber Meets the Road" asphalt rubber educational workshop April 18, 2023 in Sacramento.
Presentation by Dr. John Harvey, University of California Pavement Research Center, Davis & Berkeley, on Pavement Research and Practical Applications. Presentation delivered during the CalAPA Fall Asphalt Pavement Conference Oct. 26-27, 2016 in Sacramento, Calif.
Crumb Rubber Modified Bitumen (CRMB) is hydrocarbon binder obtained through physical and chemical interaction of crumb rubber (produced by recycling of used tyres) with bitumen and some specific additives.
Richard Steger, Platform Manger-Rehab, Ingevity, delivers a technical presentation on blanaced mix design and cracking test, addressing high-recycle content asphalt mixtures at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.
Presentation by Maged Armanuse, Branch Chief, METS, California Department of Transportation (Caltrans), on recent revisions to the HWTT (AASHTO T324) test. Presentation delivered on Nov. 6, 2019 at the California Asphalt Pavement Association Fall Asphalt Pavement Conference in Sacramento, Calif.
Presentation by Edgard Hitti on "High RAP Proposed NSSP in California" for the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 20-21, 2016, in Ontario, CA.
Brandon Milar, P.E., Director of Technical Services for CalAPA, delivers a technical presentation on Warm Mix Asphalt standards and technology at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.
Cold Mix Asphalt Technology (DPWH Item 308 & 304-A) is a cost effective material and better alternative to existing gravel roads (Barangay & Farm-to-Market Roads) in the countryside and also for preventive maintenance of existing paved roads.
Richard Steger with Ingevity gives a technical presentation on balanced mix design and the development of a pavement cracking test at the CalAPA Spring Conference & Equipment Expo April 12-13, 2017 in Ontario, Calif.
Evaluation on Low Temperature Performance of Recycled Asphalt Mixture Using W...IJERA Editor
In this paper, the basic idea is about the recycled technology of asphalt mixture, more in-depth study of the low-temperature performance of warm mix asphalt(WMA).First of all, Including the evaluation of low temperature performance of WMA made of reclaimed asphalt pavement (RAP) (passed and not passed 2.36mm screen), and the influence of WMA with RAP mixed of different dosage of dispersant. Then, using the SBS modified asphalt and base asphalt were test at low temperature, research on the influence of different type of asphalt to the low temperature performance of WMA.
Hear about the latest research the UCPRC is conducting into asphalt pavements for Caltrans, the Federal Highway Administration, the Federal Aviation Administration and others, as well as highlighting the evaluation of long-life (perpetual) asphalt pavement projects in California designed to last 40 years or more with minimal maintenance.
Overview of laydown considerations of Rubberized Hot Mix Asphalt. Delivered at the California Asphalt Pavement Association "Where the Rubber Meets the Road" asphalt rubber educational workshop April 18, 2023 in Sacramento.
Presentation on asphalt binders by Bob Humer, Asphalt Institute, delivered at the California Asphalt Pavement Association (CalAPA) Spring Asphalt Pavement Conference April 25-26, 2018 in Ontario, CA.
At the California Asphalt Pavement Association (CalAPA) Spring “Technical Tune-Up” Educational Workshop held April 5, 2022 in Brea, a presentation titled, "Cold in-place Recycling (CIR) and Cold Central Plant Recycling (CCPR) in Sustainable Pavement Rehabilitation &
Reconstruction" was delivered by Michael Concannon, P.E., Engineering Manager, Pavement Recycling Systems, and
Kevin Donnelly, APM, Director - Southern Region, Western Emulsions.
City and County agencies in California are utilizing Sustainable Pavement Engineering processes, such as Cold Central Plant Recycling (CCPR) and Cold In-place Recycling (CIR) of asphalt to stretch their roadway budgets,
achieve their sustainability goals, and reduce construction-related community impacts. This tech tune-up presents
the latest updates on Public Works Specifications for these processes, Mix Design requirements, and highlights a
few recently completed projects.
2017 CalAPA Fall Asphalt Pavement Conference presentation: New specifications are available that provide local agencies the ability to utilize the latest in asphalt mix design and material testing. Presented by Brandon Milar, CalAPA, substituting for Frank Farshidi, Project Manager, City of San Jose Department of Transportation.
Presenation by Jay Behnke of STATE Testing on RAP and RAS at the California Asphalt Pavement Association Spring Conference April 25, 2013 in Ontario, CA.
Get an insider’s view of the “Greenbook,” the Standard Plans for Public Works Construction utilized by many local agencies in Southern California, including current and planned updates to the specifications as it relates to asphalt pavements.
An orientation on changes to Caltrans asphalt pavement specifications to incorporate elements of the national "Superpave" standard. Presented by Joe Peterson, chief, Office of Roadway Materials Testing for Caltrans at the Dec. 3, 2014 CalAPA L.A. and High Desert Technical Committee meeting in Fontana.
This presentation focuses on the decreasing quality and life of asphalt pavements in the United States, and what the asphalt industry can do to improve sustained age-resistance in our paving materials.
A blend of asphalt cement, reclaimed tire rubber and certain additives in which the rubber component is at least 15% by weight of the total blend and has reacted in the hot asphalt asphalt cement sufficiently to cause swelling of the rubber particles.
Presentation on Warm Mix Asphalt (WMA) delivered by Brandon Milar of MeadWestvaco at the CalAPA joint industry-agency Technical Committee meeting Dec. 10, 2014 in San Diego.
Presentation by CRM, a leading recycled rubber supplier to the asphalt market, on the use of Rubberized Hot Mix Asphalt. Delivered at the California Asphalt Pavement Association "Where the Rubber Meets the Road" asphalt rubber educational workshop April 18, 2023 in Sacramento.
As the saying goes, Good roads cost money, and bad roads cost more. Hear the latest from the world of pavement preservation and how preservation strategies can stretch tight road maintenance dollars, as well as when maintenance becomes rehabilitation.
Presentation by Cathrina Barros of Caltrans on Testing Accreditation and Independent Assurance delivered at the CalAPA Fall Asphalt Pavement Conference Oct. 24, 2013 in Sacramento, Calif.
Chris Sparks with MacRebur delves into the utilization of reclaimed plastics into asphalt pavement mixes delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Dan Staebell with Cargill examines the use of WMA, RAP and other technologies to lower asphalt's carbon footprint in a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Marco Estrada with PRS provides an industry perspective of cold in-place recycling in a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Dr. Dave Jones of the University of California Pavement Research Center provides an academic perspective of in-place recycling in a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Larry Hernandez with Caltrans provides the department's perspective on in-place recycling in a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Dr. John Harvey, director, University of California Pavement Research Center, reviews the most recent research with regard to Reclaimed Asphalt Pavement during a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Erik Updyke, project manager for the City & County Pavement Improvement Center, focuses on pavement quality for local agencies in a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Buzz Powell, technical director, Asphalt Pavement Alliance, examines various trends in the industry from a national perspective in a presentation delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Scott Dmytrow with PavementACES, a noted pavement preservation expert, provides an update on various tools and techniques in the pavement preservation space delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Presentation by Joseph Dongo of Caltrans on the department's eTicketing initiative for construction materials transport delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Alex Richardson with Haul Hub delivers a presentation on eTicketing technology delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Presentation on Environmental Product Declarations and benchmarking delivered by Amlan Mukherjee of WAP Sustainability during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario.
Presentation by Cathrina Barros of Caltrans, co-chair of the Women of Asphalt California Branch, on Women of Asphalt Activities in 2023 and 2024 delivered during the CalAPA Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario
Presentation on the City & County Pavement Improvement Center delivered at the California Asphalt Pavement Association Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Presentation by Sean Devine of X-B-E on the "Hey NAPA" research tool utilizing AI technology, and other implications of AI for our industry, delivered at the California Asphalt Pavement Association Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
An overview of the Caltrans District 8 program and priorities delivered at the California Asphalt Pavement Association Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Update on the Joint Training & Certification Program for materials technicians in California delivered at the California Asphalt Pavement Association Spring Asphalt Pavement Conference March 7-8, 2024 in Ontario, Calif.
Presentation on "Pointers & TIps" related to Environmental Product Declarations (EPDs) from the perspective of an asphalt plant expert delivered by T.J. Young at the CalAPA EPD workshop on Oct. 25, 2023 in Sacramento.
Presentation titled "The Emerald Eco-Label Tool & Lessons Learned" delivered by Amlan Mukherjee, Ph.D., P.E. of WAP Sustainability Consulting at the CalAPA EPD workshop on Oct. 25, 2023 in Sacramento.
Presentation on the national perspective on Environmental Product Declarations (EPDs) delivered by Joseph Shacat of the National Asphalt Pavement Association (NAPA) at the CalAPA EPD workshop on Oct. 25, 2023 in Sacramento.
Presentation on "Challenges for Environmental Product Declarations (EPDs) Implementation" delivered by Dr. John Harvey of the University of California Pavement Research Center (UCPRC) at the CalAPA EPD workshop on Oct. 25, 2023 in Sacramento.
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2. If you think you know everything
about asphalt rubber pavements?
Think again!
Major changes in California
regarding AR pavements.
3. Asphalt Rubber History
Asphalt Rubber
Chip Seal (SAM)
A R Chip Seal
Interlayer (SAMI)
AZ
Open-Graded
Hot Mix
CA
Dense-Graded
Hot Mix
Gap-Graded
Hot Mix
1960
1970
1980
1990
2000
2010
4. Definition of Asphalt Rubber
Uses a minimum of 20 +/- 2 % crumb rubber
Uses 10 mesh (2mm) crumb rubber
Reacts/interacts crumb rubber for a minimum of 45
min. at elevated temperatures
Modifies original properties of asphalt cement
Only crumb rubber binder with an ASTM definition
and extensive research background
5. What is Asphalt Rubber Binder?
It is a NON PRORIATARY recipe specification
A blend of recycled tire rubber, asphalt and extender
oil
Reacted at high temperatures to significantly modify
the asphalt
Result is a unique product – asphalt rubber binder
AR has a 45 year proven performance history
6. How is Asphalt Rubber produced?
Specialized equipment and binder blended
on-site
High shear blender for mixing crumb rubber
with asphalt and modifier
Reaction tank with adequate agitation to
assure proper reaction
All materials are metered-in
7. Asphalt Rubber Blending Schematic
Asphalt Storage
Tank
Heat Tank
Binder
Pumped
to Plant
Crumb
Rubber
High Shear
Blender
Reaction Vessel
20. Key to asphalt
rubber is high
viscosity and
reduced aging
properties.
13 Year Old Asphalt Rubber Chip Seal
21. Where have Asphalt Rubber strategies
been used successfully?
AR
Hot Mix
AR
Chip Seals
22 yrs. old
15 yrs. old
AR
AR
Cape Seals
Multi-layer
Strategies
20 yrs. old 10 yrs. old
23. What are the major changes
in California (Caltrans)
regarding specifications for
AR pavements?
24. Changes in AR Pavements in
California
Changes in Caltrans specifications
New Superpave specifications
Some changes made to Section 39
Changes in testing requirements
Gyratory compactor
Hamburg wheel tracking
Moisture sensitivity, minimum dry and wet strengths
Changes in acceptance requirements
Changes in measuring
MPQP
25. Changes in Specifications
New Superpave specification developed by
Caltrans with major changes to RHMA
requirements (will be finalized in July 2014)
Some changes also made to Section 39 in
standard specifications
New specs have new requirements for RHMA
Laboratory mix design
Field mix acceptance
26. Changes in Mix Design Testing
Increase in minimum binder content to
7.5 % by total weight of mix (move from
min. 7.0% to 8.1% by dry weight of
aggregate)
However, no change in the minimum void
requirements or aggregate grading
requirements - makes this especially
difficult
27. Changes in Mix Design Testing
AASHTO T-312 gyratory compactor now required for
compaction during mix design (National Standard from
SHRP)
Move away from Hveem kneading compactor
New compaction method in California for all mixes,
labs have very little experience
Contractor’s/labs need to familiarize themselves with
new method
New method allows variable compaction to achieve
mix voids requirements (N design 50-150 gyrations and
can increase pressure to 825 kPa)
29. Changes in Mix Design Testing
AASHTO T-324 (modified) Hamburg testing
requirement
Maximum rut depth requirement of 0.5 inch on
field produced mixes
Rut depth - minimum number of passes (15,000 to
25,000) depending on type and grade of asphalt
(PG 58, 64 or 70)
Inflection point - minimum number of passes
(10,000 to 15,000) depending on type on grade
of asphalt (PG 58, 64 or 70)
31. Changes in Mix Design Testing
AASHTO T-283 (modified) Moisture
Induced Damage Test requirement
Minimum dry strength of 110 psi on
field produced material
Minimum wet strength of 84 psi on field
produced material
Freeze thaw cycle required
32. Changes in Acceptance
Binder content tolerance changed from +/- 0.5%
to - 0.4% +0.5%
In-place mix density requirements changed from
91-97% relative density to 92-97%
Air voids requirement in field changed from +/2% to +/- 1.5%
33. Changes in Measuring
New requirements for AR in the Materials
Plant Quality Program (MPQP)
New requirements for weights and measures
for AR blending and production
New recording requirements
New reporting requirements
Asphalt rubber MPQP requirements are
different from other types of binder
production
34. Use of Warm Mix Technology in
RHMA
Contractor now has the option to use
warm mix technology (WMA) in asphalt
rubber hot mix.
WMA will help offset low temperature
placement problems
WMA will aid in the compaction process
35. WMA Benefits to Contractor
Reduced worker exposure to fumes
Decreased emissions at HMA plant
Savings in energy
Easier permitting
Extended haul distances
Lower odor/fumes
Improved thin lift capabilities
Expanded season
36. What to Expect in the Future
Performance Grade (PG) AR specification
Sub-Task Group formed under CT/Industry Rock
Products Committee to work on development of a PG
specification for asphalt rubber - 3 year work plan
Draft specification developed by Industry
Initial round robin testing conducted through the
PCCAS to determine feasibility of using Dynamic
Shear Rheometer (DSR) for testing AR binders
Very successful –results indicate DSR can be used for
testing AR binders
Second round robin planned for early next year
37. AB 513 (FRAZIER)
Establishes the rubberized asphalt concrete (RAC)
market development act.
Requires CalRecycle to award grants to California
Cities, Counties, and regional park districts.
Requires grants provide $2 for every 12 lbs. of crumb
rubber used in a paving project.
Limited to road rehabilitation, not chip seal projects
which use less crumb rubber.
38. AB 513 (FRAZIER)
Background on why this bill is needed.
CalRecycle collects $40 million annually for its tire fund
from the fee on sale of new tires.
Of all the programs to divert tires from landfills, RAC
grants have had the most success. Environmental groups
support RAC because it is considered the highest and best
use of tire recycling.
Most California Cities and Counties are strapped for
money and even though life cycle costs for RAC are less
than conventional asphalt, local governments look for up
front savings.
39. AB 513 (FRAZIER)
Conventional asphalt is cheaper up front. Unless they can
get grants, they usually repave with conventional asphalt)
The RAC grants are so popular in California that this past
year $3 million was allocated for them but there were
almost $10 million in qualified grant applications from
cities and counties.
Governor Jerry Brown signed AB 513 on October 3,
2013.
Net result to industry is $7,000,000 +
40. How do you get your bang
for your buck using Asphalt
Rubber design?
41. Reflection Crack Retardation
Equivalencies (ft.)
HMA
RHMA-G
RHMA-G
Over SAMI-R
0.15
0.10
--
0.20
0.10
--
0.25
0.15
--
0.30
0.15
--
0.35
0.15 or 0.20a
0.10 or 0.15a
0.45
0.15/0.15 HMA
0.20
a. Depending on crack width and base conditions
42.
43. 3-Layer AR Cape Seal San Leandro
Original
AR Chip Seal
Microsurfacing as Leveling
Slurry/Micro Surfacing