The National Academies Press

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From page 39... ... 39 chapter four Case examples of performanCe speCifiCations for asphalt mixtures introduCtion Based on the survey responses, a number of agencies indicated that they are in the process of implementing performance specifications for asphalt mixtures or conducting research with performance tests to support their eventual implementation. As shown previously in Figures 1 and 2, there were 12 agencies that were interviewed to gather more information on their current and planned activities and to present the detailed information in the form of case examples. Read the entire page →
From page 40... ... 40 Edmonton specifications for SMA Paving (Section 02067) , as well as for Recycled Asphalt Paving (Section 02966) Read the entire page →
From page 41... ... 41 system that includes both accept/reject items and pay adjustments. It has established pay tables that are based primarily on gradation, AC content, and in-place air void content, with special pay adjustments applied for projects failing to meet pavement smoothness requirements. Read the entire page →
From page 42... ... 42 the performance testing using GDT-66 for SMA mixtures as part of its mix design criteria (Georgia Department of Transportation 2013) Read the entire page →
From page 43... ... 43 cally on the stiffness and moisture resistance properties. For instance, it has participated in the AMPT pooled fund study and sponsored research related to the most effective antistripping agents for moisture-susceptible asphalt mixtures. Read the entire page →
From page 44... ... 44 air voids, VMA, and gradation, whereas the roadway acceptance tests include pavement density and surface tolerance (Louisiana Department of Transportation and Development 2006) Read the entire page →
From page 45... ... 45 To generate these initial performance-descriptive values, loose mixture samples were taken from 28 Superpave projects between 1997 and 2002. Gyratory specimens were fabricated and run in the SCB test at the Louisiana Transportation Research Center (LTRC) Read the entire page →
From page 46... ... 46 new Jersey In New Jersey, approximately $300 million of the New Jersey DOT's budget of $2.52 billion is allocated to roadway assets, which consist primarily of paving projects (New Jersey Department of Transportation 2014) Read the entire page →
From page 47... ... 47 details of the criteria that must be met in any asphalt JMF that contains a high percentage of RAP materials. New Jersey DOT specifications also address performance testing for high RAP mixtures for acceptance and pay adjustment. Read the entire page →
From page 48... ... 48 VCA of the aggregates (VCAdry) , and the VMA is required every 3,500 tons of produced mix. Read the entire page →
From page 49... ... 49 erties used in its current Superpave asphalt specifications (i.e., asphalt content, gradation, air voids, and VMA) to be indirect measures of performance (i.e., durability) Read the entire page →
From page 50... ... 50 has moved toward the development of a performance test for cracking using a balanced mix design procedure for its asphalt performance mixes. This shift included a simple mechanistic-based asphalt overlay design procedure. Read the entire page →
From page 51... ... 51 the HWTD and TSR tests in its standard mixes for rutting resistance and resistance to moisture damage. Utah DOT noted that it has stopped paying for binder separately in its contract items, which resulted in contractor mixes with lower AC content for its Superpave mixes. Read the entire page →
From page 52... ... 52 would be to develop and populate a materials database that would provide the contracting industry with a basis for determining what the typical properties of their materials are for use in bidding flexible pavement projects. maryland The Maryland State Highway Administration reported that it is participating in a pooled fund research study focused on minimizing the cost of the AMPT equipment to make it more affordable for state officials to complete testing to generate Level 1 materials inputs to the AASHTOWare Pavement ME Design software. Read the entire page →
From page 53... ... 53 central laboratory has the ability to run tests as well, in the event that the district laboratories are too busy or have specialty testing or forensic investigation needs. Finally, Virginia DOT uses the Bond test currently in referee-type circumstances (i.e., where the issue goes into a dispute resolution process including the contractor and state highway agency) Read the entire page →

From page 39...

... 39 chapter four Case examples of performanCe speCifiCations for asphalt mixtures introduCtion Based on the survey responses, a number of agencies indicated that they are in the process of implementing performance specifications for asphalt mixtures or conducting research with performance tests to support their eventual implementation. As shown previously in Figures 1 and 2, there were 12 agencies that were interviewed to gather more information on their current and planned activities and to present the detailed information in the form of case examples.