The Superpave Mix Design System: Anatomy of a Research Program (2012) / Chapter Skim
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Pages 159-174
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157 Chapter 6. Lessons Learned and Conclusion This section discusses some key lessons learned through the SHRP Asphalt Research Program and the implementation of its products.
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158 Tables 3 and 4 between 1988 and 1990 and for the selected contractors to carry out the research and develop the products between 1988 and 1993. Was this allocation of time and resources (money)
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159 emphasis on research to improve asphalt binders." Knowing what we know now, it is clear that diverting funds from the asphalt binder specification to that of the asphalt-aggregate mixture specification during SHRP would have jeopardized the former without significantly improving the later. The planners' direction was prescient.
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160 cause serious compromises to the research. If the scope of the research is clearly understood prior to commencement, then either sufficient resources can be dedicated or a revised scope can be developed to match resources.
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161 components to the Superpave software. The core software was designed to evaluate performance test results, extract pertinent asphalt mixture material properties and predict performance.
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162 research tool to validate the asphalt binder specification. Once this decision was made, work progressed on using indirect tensile testing for low-temperature cracking.
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163 obvious from Figure 42. Indeed, if the goal of the asphalt mixture research program was to select engineering properties to predict mixture performance, then the first order of business should have been to select the properties and the models for material behavior and mixture performance.
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164 development contract. And, the modeling contract was developing tests to measure their properties because the tests from the other contract did not work as well for those properties.
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165 One of the key challenges for the technical and administrative directors of a large research program is to develop and nurture a team mentality. During the asphalt research program there were examples of both good and bad team behavior.
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166 6.9 EXPECT RESEARCHERS TO BE SOLELY DEDICATED TO THE RESEARCH EFFORT Usually researchers are involved in a multiplicity of activities. A university professor may have multiple research projects, teach classes and be involved in university administration.
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167 of its highest rated research needs. It is anticipated that ETGs and TWGs will continue to be used in the future to oversee and coordinate efforts in a variety of fields.
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168 • The A-003A researchers agreed with the tests included in the system but disagreed with the performance prediction models and their use in a mix design system. In fact, they continued independent development of their system for several years following SHRP.
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169 It is safe to say that although many recognized that significant investments would be required to implement the Superpave technology, the total magnitude of that investment was not initially anticipated. Future implementers of large-scale research efforts should be aware of the magnitude of the task ahead of them.
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170 must plan for the safe storage of backups to preserve the otherwise irreplaceable database amassed over 20 years. So, there is a need to build grassroots support for the program and continue to promote the program.
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171 Other successful examples of getting the technology out to the audience include the loaned binder equipment and the pooled-fund equipment buy. FHWA has continued to offer to lend some equipment to agencies for trial when feasible; examples include outflow meters, safety edge molds, etc.
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172 • Recognize the "politics of ideas" and that researchers will defend their positions. • Develop an atmosphere fostering teamwork and cooperation rather than competition.
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