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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>STIFFNESS HISTORY OF ASPHALT CONCRETE SURFACES IN ROADS</title>
      <link>https://trid.trb.org/View/103611</link>
      <description><![CDATA[A SYSTEM FOR PREDICTING THE STIFFNESS HISTORY OF AN ASPHALT CONCRETE PAVEMENT LAYER THROUGHOUT ITS DESIGN ANALYSIS PERIOD HAS BEEN DEVELOPED. THE SYSTEM USES STANDARD MATERIAL PROPERTIES AND ENVIRONMENTAL INPUTS TO PREDICT THE DAILY CHANGES IN STIFFNESS DUE TO TEMPERATURE VARIATIONS AND ALSO THE LONG-TERM CHANGES IN STIFFNESS DUE TO HARDENING OF THE ASPHALT CEMENT GINDER. THIS SYSTEM WAS DEVELOPED AS PART OF AN OVERALL SYSTEM FOR THE PREDICTION OF LOW-TEMPERATURE AND THERMAL-FATIGUE CRACKING IN FLEXIBLE PAVEMENTS. THE FOLLOWING PROCEDURES AND MODELS WERE DEVELOPED FROM ACTUAL PROJECTS AND OTHER RESEARCH RESULTS: MODELS TO ESTIMATE THE ASPHALT CONCRETE STIFFNESS FROM THE ORDINARY LABORATORY MEASUREMENTS, PROCEDURE TO ESTIMATE THE LOADING TIME FOR TEMPERATURE, AND MODELS TO PREDICT THE INSERVICE AGING OF ASPHALTS. THE SYSTEM HAS BEEN USED IN PREDICTING LOW-TEMPERATURE AND THERMAL-FATIGUE CRACKING AND HAS SHOWN A GOOD DEGREE OF RELIABILITY.]]></description>
      <pubDate>Wed, 15 May 1974 00:00:00 GMT</pubDate>
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      <title>PREDICTION OF LOW TEMPERATURE AND THERMAL-FATIGUE CRACKING IN FLEXIBLE PAVEMENTS</title>
      <link>https://trid.trb.org/View/96166</link>
      <description><![CDATA[IN THIS RESEARCH EFFORT, A SYSTEM WAS DEVELOPED TO PREDICT THE AMOUNT OF TEMPERATURE CRACKING IN ASPHALT CONCRETE SURFACES THROUGHOUT THEIR SERVICE LIVES USING LABORATORY MATERIALS DATA AND AVAILABLE WEATHER INFORMATION. BASICALLY, FOUR MODELS WERE DEVELOPED TO FORM THE SYSTEM. THE CONSIDERATION OF THERMAL-FATIGUE CRACKING (MODEL IV) DUE TO DAILY TEMPERATURE CYCLING MAKES THE SYSTEM AN IMPROVEMENT OVER OTHER AVAILABLE TECHNIQUES IN THIS FIELD. IN ANALYZING THE SYSTEM, THE MOST IMPORTANT WEATHER PARAMETERS WITH RESPECT TO TEMPERATURE CRACKING WERE FOUND TO BE SOLAR RADIATION AND AIR TEMPERATURE. THE MOST IMPORTANT ASPHALT CONCRETE PROPERTIES WERE FOUND TO BE THE THERMAL COEFFICIENT OF CONTRACTION AND ASPHALT PENETRATION AND TEMPERATURE-SUSCEPTIBILITY. THE ADOPTION OF THE SYSTEM BY THE HIGHWAY AGENCIES WHO ARE CONCERNED WITH TEMPERATURE CRACKING SEEMS WARRANTED. THE SYSTEM IS MADE AVAILABLE IN THE FORM OF A SINGLE COMPUTER PROGRAM AND IS EASY TO ADOPT SINCE MOST OF THE NECESSARY INFORMATION FOR USING THE COMPUTER PROGRAM NEEDS TO BE COLLECTED ONLY ONE TIME. THE SYSTEM CAN BE A DECISION-MAKER TO ACCEPT OR REJECT AN ASPHALT SUPPLIER; IT CAN ALSO HELP THE ENGINEER IN DESIGNING AN ASPHALT CONCRETE MIXTURE THAT WILL BEST FIT THE SURROUNDING ENVIRONMENTAL CONDITIONS. ABOVE ALL, THE USE OF THE PROPOSED SYSTEM WILL REDUCE MAINTENANCE COSTS. /AUTHOR/]]></description>
      <pubDate>Wed, 15 Aug 1973 00:00:00 GMT</pubDate>
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