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From page 103... ... 103 A P P E N D I X D Tabulated Industry Survey Responses This section summarizes the responses to the survey as reported by the industry representatives. Numbers in brackets or on the Totals line in tables are the number of responses for each option. Read the entire page →
From page 104... ... 104 Impact of Asphalt Thickness on Pavement Quality Mostly Work In: Routinely Work In: Policies/ Guidelines? How Enacted? Read the entire page →
From page 105... ... Tabulated Industry Survey Responses 105 3. How do you typically measure pavement density for quality control? Read the entire page →
From page 106... ... 106 Impact of Asphalt Thickness on Pavement Quality Mostly Work In: Routinely Work In: Nuclear Gauge Non-Nuclear Gauge Cores Other OK OK • • OR OR • PA PA • • PA PA • SC SC • • • SC NC, SC • • • SC SC • • VA VA • • VA VA • • VA VA • • VA VA • • VA VA • • VA VA • • • VA VA • • WA WA • • WY AZ, CA, KY, NV, WY • • Totals 36 26 54 3 No responses indicated "not applicable/ state measures." Comments: o Contractor Quality Control. For pay, Contractor cuts cores and [agency] Read the entire page →
From page 107... ... Tabulated Industry Survey Responses 107 4A. Have you observed more difficulty in obtaining required field densities since implementing the Superpave mix design system in the states where you work? Read the entire page →
From page 108... ... 108 Impact of Asphalt Thickness on Pavement Quality Mostly Work In: Routinely Work In: Yes, initially but less so now Yes, continuing to be difficult Yes, with certain mixes/ applications No Unsure Have not implemented Superpave VA VA • VA VA • VA VA • VA VA • VA VA • VA VA • VA VA • WA WA • WY AZ, CA, KY, NV, WY • Totals 20 1 18 8 7 4 4B. If the situation has improved, what changed? Read the entire page →
From page 109... ... Tabulated Industry Survey Responses 109 4C. Have you observed any increased difficulty obtaining adequate density in mixtures with these components or in these applications in any of the states where you work? Read the entire page →
From page 110... ... 110 Impact of Asphalt Thickness on Pavement Quality 5. Do any of the agencies you work for allow the use of warm mix asphalt technologies at conventional temperatures as a compaction aid? Read the entire page →
From page 111... ... Tabulated Industry Survey Responses 111 Mostly Work In: Routinely Work In: WMA for Compaction? If allowed, how often do you use? Read the entire page →
From page 112... ... 112 Impact of Asphalt Thickness on Pavement Quality 6. Have you observed any asphalt pavement performance problems that are perceived to be related in whole or in part to inadequate compaction during construction? Read the entire page →
From page 113... ... Tabulated Industry Survey Responses 113 Mostly Work In: Routinely Work In: In cr ea se d Ru tti ng In cr ea se d Cr ac ki ng In cr ea se d Pe rm ea bi lit y D ec re as ed D ur ab ili ty Sh or te ne d Se rv ic e Li fe In cr ea se d M ai nt en an ce O th er MO KS, MO • • • • NE NE • • NY NY • • NC NC • OH OH • • • • OK OK • • • • OR OR • • • • • PA PA • PA PA PA PA • • • • • • SC SC SC SC • • • • SC NC, SC • VA VA • • VA VA • • • • VA VA • • VA VA • • • • • • VA VA • • • • VA VA • • VA VA • • • • • • WA WA • WY AZ, CA, KY, NV, WY • • • • • • Totals 15 23 25 31 36 24 9 Comments: o Nothing significant. o Most all performance issues are related to compaction. Read the entire page →
From page 114... ... 114 Impact of Asphalt Thickness on Pavement Quality 7. Have you encountered situations during project planning or construction where you have requested exceptions or waivers to the lift thickness requirements? Read the entire page →
From page 115... ... Tabulated Industry Survey Responses 115 Mostly Work In: Routinely Work In: Re qu es te d W ai ve r? Reason to Request Waiver/Exemption? Read the entire page →
From page 116... ... 116 Impact of Asphalt Thickness on Pavement Quality 8. Have you had to change your mix designs, compaction, or other processes to cope with compaction difficulties? Read the entire page →
From page 117... ... Tabulated Industry Survey Responses 117 Mostly Work In: Routinely Work In: M ad e Ch an ge s? How successful were the changes? Read the entire page →
From page 118... ... 118 Impact of Asphalt Thickness on Pavement Quality 9. Do you see a need for additional research into any of the following? Read the entire page →
From page 119... ... Tabulated Industry Survey Responses 119 Mostly Work In: Routinely Work In: Fi el d Va lid ati on o f t/ N M AS Im pr ov in g M ix Co m pa cti bi lit y Ac hi ev in g M at De ns ity Te st s/ Te ch no lo gy Eff ec ts o f M ix Pr op er tie s O th er PA PA • PA PA PA PA • SC SC • • SC NC, SC • SC SC • • • VA VA • • • VA VA • • • • • VA VA • • VA VA VA VA • • VA VA • • • VA VA • VA VA • WA WA • WY AZ, CA, KY, NV, WY • Totals 30 22 13 23 18 12 Comments: o Better understanding of the effect that the liquid portion in recycled products will have on the end product. o Education in design to spec the right mix and not copy 20-year-old specs from somewhere. Read the entire page →
From page 120... ... 120 Impact of Asphalt Thickness on Pavement Quality 10. If you have any additional thoughts or information on your organization's experience with the effects of asphalt lift thickness on pavement performance, please describe briefly here or indicate if you are willing to be contacted for further information. Read the entire page →

From page 103...

... 103 A P P E N D I X D Tabulated Industry Survey Responses This section summarizes the responses to the survey as reported by the industry representatives. Numbers in brackets or on the Totals line in tables are the number of responses for each option.