Short-Term Laboratory Conditioning of Asphalt Mixtures (2015) / Chapter Skim
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13 This chapter provides an overview of the experimental design for Phases I and II, field site descriptions, specimen fabrication protocols, and laboratory tests. Experimental Design Phase I Experiment The objectives of the Phase I experiment were to (1)
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14 times (ranging from 8 to 22 months) were incorporated in Phase II to quantify aging in the field.
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15 field sites built in different climates and at various times of the year. Details of the CDD values for field sites included in this project are presented and discussed in the next chapter.
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16 mixture property ratios, the correlation between field aging and laboratory LTOA protocols could be made. To sum up, the mixture and binder results obtained in the Phase II experiment for cores versus LMLC specimens with STOA plus LTOA protocols were used to evaluate the effect of field and laboratory aging on mixture properties and to develop a correlation between field aging and laboratory LTOA protocols.
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17 compacted to a height of 6.7 in.
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18 As illustrated in Figure 2-6, the fitted HWTT rut depth curve was composed of one part with negative curvature used to evaluate mixture resistance to rutting due to deformation, followed by a second part with positive curvature used to evaluate mixture resistance to stripping. The critical point where the curvature changed from negative to positive was defined as the stripping number (SN)
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19 temperatures. As shown in Figure 2-7, the equipment used in this project was a Malvern Bohlin DSR2.
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20 respectively. Then, the creep stiffness for the BBR test was calculated using Equation (2-15)
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21 Nicolet 6700 FT-IR spectrometer used in the project. During the test, a Teflon-coated spatula was used to apply the molten asphalt sample (approximately 0.5 g)
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22 Location & Climate Date Plant Type TProduction Asphalt Aggregate & Additives Mixtures Factors Texas II Local Dry–No Freeze 4/14 CFD BMP 310°F (154°C) HMA (Binder V, CFD)
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23 TXI NM 76 NM 64 CT WY SD IA FL IN TXII-A TXII-V Specified –22.0 –28.0 –28.0 –22.0 –28.0 –34.0 –28.0 –22.0 –22.0 –22.0 –22.0 Graded –23.8 –30.8 –27.4 –24.6 –25.4 –34.9 –29.2 –28.3 –21.6 –24.4 –24.0 –40 –34 –28 –22 –16 Lo w -T em pe ra tu re P G Figure 2-12. Continuous low-temperature PG results.
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24 Table 2-3. Continuous PG summary.
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