Performance Specifications for Asphalt Mixtures (2016) / Chapter Skim
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Pages 65-86
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From page 65... ...
65 Appendix A Survey Questions and Results Question 1: Which types of asphalt mixtures does your agency currently use for plant-produced asphalt pavements? FIGURE A1 Survey response to Question 1: "Which types of asphalt mixtures does your agency currently use for plant-produced asphalt pavements?
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From page 66... ...
66 Question 3: please provide some details on the different tests or test approaches required when recycled materials are used in an asphalt mixture. Table a3 suRvey Response To QuesTion 3: "please pRovide soMe deTails on The diffeRenT TesTs oR TesT appRoaches ReQuiRed When Recycled MaTeRials aRe used in an asphalT MixTuRe" Respondent Response Comments Arizona RAP Binder Correction Factor Ignition Furnace Correction Solvent Extraction Ignition Furnace Calibration Arkansas We require a temperature viscosity curve for the blend of reclaimed and virgin binder for all mixes using RAP except on PG 64-22 mixes with less than 15% RAP.
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67 Question 4: What attributes are typically required for initial qualification of the asphalt mixtures, prior to production? FIGURE A2 Survey response to Question 4: "What attributes are typically required for initial qualification of the asphalt mixtures, prior to production?
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68 Question 5: do these attributes (from the previous question) change, or are they combined differently, based on the type of asphalt mixture (e.g., hMa, WMa, mixtures with Rap, Ras, or crumb rubber, etc.)
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From page 69... ...
69 Question 7: is a change required by your agency's performance specifications, in terms of the sampling frequency of the volumetric mix design attributes, depending on the type of asphalt mixture? Table a7 suRvey Response To QuesTion 7: "is a change ReQuiRed by youR agency's peRfoRMance specificaTions, in TeRMs of The saMpling fReQuency of The voluMeTRic Mix design aTTRibuTes, depending on The Type of asphalT MixTuRe?
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70 Question 9: What is the status in your agency with regards to performance specifications for the design and acceptance of asphalt mixtures? note: definitions for performance-based specifications (e.g., attributes primarily used for mix design acceptance)
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71 Table a10 suRvey Response To QuesTion 10: "Why is youR agency looking aT using peRfoRMance specificaTions foR asphalT MixTuRes? " Respondent Response Comments Colorado Currently ONLY using performance-related specifications; i.e., AC content, Voids, etc.
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72 Question 13: Which attributes does your agency consider most important for pavement performance? FIGURE A5 Survey response to Question 13: "Which attributes does your agency consider most important for pavement performance?
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From page 73... ...
73 Respondent Response Comments Arkansas Sometimes the APA is run Clark County, Nevada Arterial and collector = APA Colorado Test data from AMPT (resilient modulus, flow number, etc.) Connecticut Raveling and segregation Georgia Moisture susceptibility testing Kansas Low temperature cracking Louisiana Hamburg; SCB Minnesota Thermal cracking Montana Hamburg, in place voids Nebraska Cracking Nevada IRI Orange County, California Stability value Pennsylvania With concern that mixtures do not contain sufficient asphalt for durability, we are looking at rutting tests to add additional asphalt above optimum without increasing rutting significantly.
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From page 74... ...
74 Question 16: What specific asphalt mixture performance properties were used or considered for the integration of mixture acceptance and pay factor assignment? 7 DOTs 5 DOTs 5 DOTs 12 DOTs 5 DOTs 0% 10% 20% 30% 40% 50% 60% 70% Fatigue resistance Stiffness modulus (i.e., dynamic modulus)
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75 Question 18: for which types of asphalt mixtures does your agency use the following performance parameters? Fatigue Resistance Thermal Cracking Resistance Durability Moisture Resistance Stiffness Modulus Number of Total Responses Standard structural lift 3 4 6 22 1 23 Standard overlay lift 2 3 8 20 0 22 High performance thin overlays 1 1 6 13 1 16 Binder rich intermediate course 2 0 0 4 1 5 Bridge deck surface course 2 0 1 5 1 5 Bottom rich base course 3 0 0 6 2 7 Respondent Response Comments Alabama Fatigue resistance for standard structural SMA mixes Alaska Any asphalt mixture in pavement design for fatigue resistance Colorado Not currently used Kansas AASHTO TSRST test for thermal cracking resistance New Jersey Moisture resistance for Asphalt Rubber Gap Graded Course Table a15 suRvey Response To QuesTion 18: "foR Which Types of asphalT MixTuRes does youR agency use The folloWing peRfoRMance paRaMeTeRs?
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76 Respondent Response Comments Colorado Performance-based specifications not currently used New Brunswick, Canada Not being considered Missouri When the appropriate tests are selected along with the required limits for achieving satisfactory field performance. Tests need to be straightforward, easy to perform, and affordable for contractors to purchase and perform.
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77 Question 21: if you are using performance-based mix design properties for qualification of the mix design or Qc and acceptance, which performance properties and tests are used? Fa gue resistance S ffness modulus (e.g.
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78 Question 22: does your agency use independent assurance (ia) for performance-based tests of asphalt mixtures?
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79 Question 24: as part of your agency's Qa plan for the use of asphalt performance-based mix designs, who is responsible for performance testing? 5 DOTs 13 DOTs 4 DOTs 10 DOTs 22 DOTs 1 DOT 0% 10% 20% 30% 40% 50% 60% Contractor us ing a commercial laboratory Agency using a state laboratory Agency using a commercial (or testing consultant)
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80 Question 26: has the testing time (and the level of effort required for analyzing test results) been a deciding factor in whether to implement performance-based specifications on a project?
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81 Question 28: has cost been a deciding factor in whether to implement performance-based specifications on a project? Table a25 suRvey Response To QuesTion 28: "has cosT been a deciding facToR in WheTheR To iMpleMenT peRfoRMance-based specificaTions on a pRojecT?
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82 Respondent Response Comments Manitoba, Canada We conducted an environmental scan on Canada (cost only) method-based vs.
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83 Question 33: is your agency conducting or sponsoring, or planning to conduct or sponsor, any research related to demonstrating or implementing other potential performance tests in specifications for asphalt mixtures? Response Type Response Rate Yes 39% No 61% Number of Total Responses 44 Table a28 suRvey Response To QuesTion 33: "is youR agency conducTing oR sponsoRing, oR planning To conducT oR sponsoR, any ReseaRch RelaTed To deMonsTRaTing oR iMpleMenTing oTheR poTenTial peRfoRMance TesTs in specificaTions foR asphalT MixTuRes?
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84 Question 35: please provide some information on the research underway at your agency related to performance testing for asphalt performance-based specifications. Table a30 suRvey Response To QuesTion 35: "please pRovide soMe infoRMaTion on The ReseaRch undeRWay aT youR agency RelaTed To peRfoRMance TesTing foR asphalT peRfoRMance-based specificaTions" Respondent Response Comments Colorado Currently performing AMPT Testing for E*
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85 Question 36: Which types of efforts related to asphalt performance specifications have your agency pursued? 4 DOTs 9 DOTs 5 DOTs 4 DOTs 3 DOTs 25 DOTs 0% 10% 20% 30 % 40% 50% 60% 70% Simplified Viscoelastic Continuum Damage (S-VECD)
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From page 86... ...
86 Question 38: What are some of the issues that make it challenging for your agency to shift to the use of performance specifications for the design and acceptance of asphalt mixtures? FIGURE A17 Survey response to Question 38: "What are some of the issues that make it challenging for your agency to shift to the use of performance specifications for the design and acceptance of asphalt mixtures?
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