Featured StoriesNAPA News & Events

CAPRI seeks letters of interest on asphalt lag and dwell time effects

The impacts of lag time and dwell time on asphalt specimens for mixture performance testing is an important question that both contractors and agencies need to understand as these tests become more widely used.

To better understand those effects, the Consortium for Asphalt Pavement Research and Implementation (CAPRI) is seeking contractors, testing labs, agencies, and related organizations to submit a Letter of Interest and Quotation for the Expanded Lag and Dwell Time experiment.

The project’s objective is to expand the lag and dwell time experiments to include mixtures from other parts of the country containing different binders, aggregates, and additives. The Request For Quotes (RFQ) is an open call for organizations to provide a fixed-price price quote to conduct the Lag and Dwell Time Experimental Plan.

Letters of interest are due May 1, and there is a mandatory pre-selection web meeting on April 15 at noon ET. Questions about the experimental plan from prospective participating organizations will be answered during the webinar.

According to the RFQ, the work includes five major tasks:

  1. Sample an asphalt mixture according to your state DOT’s procedure, including sample
    containers approved by the state DOT. Sample containers are the responsibility of the
    organization. The estimated quantity of mix to be sampled is approximately 1000 pounds. In
    addition, sample the raw materials (asphalt binder, aggregates, recycled materials, and other
    additives introduced at the plant).
  2. Split the mix sample into portions for test specimens to minimize mix aging following the
    specific experimental schedule.
  3. Compact specimens after the designated lag times (including no lag time) at the correct air void
    range for the IDEAL-CT and IDEAL-RT specimens. A total of 90 specimens are to be compacted
    and tested over the entire experiment for each mix.
  4. Condition and test the specimens according to the IDEAL-CT and IDEAL-RT procedures,
  5. Input the results of the IDEAL-CT and IDEAL-RT into a spreadsheet template that will be
    provided for the analysis.
Back to top button