DEF Grilli Andrea PhD Thesis 2007.pdf

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Advanced Testing And Theoretical Evaluation Of Bituminous Mixtures For Flexible Pavements Modulus - E* [MPa] 10000 1000 Reference temperature = 30 °C 100 0.01 0.1 1 10 100 1000 Reduced frequency [Hz] Before dry test - no temp. cycles After dry test - no temp. cycles Figure 10.18: Comparison between master curve changes before and after dry fatigue test at constant temperature for 20% ACV, typical behaviour Modulus - E* [MPa] 10000 1000 Reference temperature = 30°C 100 0.01 0.1 1 10 100 1000 Reduced frequency [Hz] Before wet test - temp. cycles After wet test - temp. cycles Figure 10.19: Comparison between master curve changes before and after wet fatigue test with temperature cycles for 20% ACV, typical behaviour 160
Chapter 10. Result analysis – Part II In addition, the mean relative reduction factors of the SLS mechanical parameters, E r , E u – E r and η were calculated for each series as shown in figure 10.20. Figure 10.20 clearly follows that after a wet test any reduction factor is significantly higher than after a dry test. Furthermore, it can be observed that the reduction of E u - E r and η are generally quite similar and they are higher than the reduction factors of E r . Reduction factor [%] 100 80 60 Er mean reduction [%] Eu-Er mean reduction [%] η mean reduction [%] 40 20 0 Dry no temp. cycles Wet no temp. cycles Dry temp. cylces Wet temp. cycles Figure 10.20: Reduction factor for each series In order to demonstrate the water effect more clearly, the ratios between the mean reduction of each SLS parameter after wet and dry testing at constant temperature are reported in table 10.9. Similarly, for assessing the temperature effect, the ratios between the mean reduction after dry tests with and without temperature cycles are given in the same table. It follows that the wet/dry ratio is generally higher than the temperature cycle/no temperature cycle ratio, which means that the water effect is more detrimental than the temperature effect for any parameter, in this case. Model parameters wet/dry Ratio (no temp. cycles) temp. cycles/no temp. cycles Ratio (no water) E r 2.6 1.9 E u – E r 2.5 1.4 η 2.5 1.5 Table 10.9: Parameters for SLS model for each specimen 161
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Università Politecnica delle March
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We'd gather around all in a room fa
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Advanced Testing And Theoretical Ev
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Chapter 5. Result analysis - Part I
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Part II Influence of water and temp
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Chapter 6. Literature review - Part
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Chapter 6. Literature review - Part
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Page 195 and 196: References References Al-Khateeb G.
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Page 201 and 202: References Kennepohl G., Kamel N.,
Page 203 and 204: References pavement materials using
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