Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II

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The briquettes for the test are secured in a steel beam. The briquettes are supported in the lateral direction by moulds that provide the circumferential support in the test bed. Confinement pressures applied on both longitudinal and transverse direction. The steel beam or test bed can accommodate up to nine briquettes. The briquettes are laterally supported by separate aluminium moulds with a width of 110mm. The moulds allow free movement of the lateral support for individual briquettes. The mould set-up is placed in a steel bath that is filled with water. The water bath can be filled to any level including a level that the briquettes completely covered with water. The bath is connected to thermal water pump that can be set to keep the water to a specific temperature. To measure the temperature of the water and briquettes, a thermocouple placed in between two briquettes while it is being set-up. The temperature can then be monitored throughout the whole test. The Figure J.2 shows a graphical image of the test bed. Figure J.2: The briquettes placed in the test bed. Before MMLS3 trafficking, the surface profile of the briquettes are measured by a profilometer. The profilometer used to measure the change in surface profiles (deformation) of the briquettes before and after testing. The profilometer, in Figure J.3, connected to a computer that plots a graphical image of the profile and saves the data as well. The profilometer rolls a sensor, as shown in Figure J.4, over the surface of the briquettes and measures the vertical displacement at 2mm intervals. Figure J.3: The Profilometer busy measures the briquettes. 4
Figure J.4: The measuring wheel of the Profilometer roll on surface of briquette The profilometer is placed on the index bars when measuring the surface of the briquettes. The index bar is there as a reference for future readings on the same briquette, see Figure 3. The first profile measurement taken on each briquette before any load application, this is the zero reading before any deformation. After each loading interval, the height of the briquettes is measured. The deformation readings are stored electronically. The readings of all the intervals of one definite briquette plotted on a single graph and then illustrate the deformation to load repetitions. The rut depth of a number of loads repetitions is defined as the maximum vertical downwards deformation in the wheel track. The upward deformation next to the wheel track defined as the heaving. It occurs when material from the path of the wheel pushing outwards to the side of the wheel, either through creep or through classical shear. This phenomenon however, is typical for the HMA, and not for BSMs. A typical example of HMA surface profile after trafficking presented in Figure J.5 below. Figure J.5: Typical plot of the HMA surface of deformed profile 5
Page 1 and 2: APPENDIX J Technical Memorandum Upd
Page 3: findings of the moisture damage tha
Page 7 and 8: An electric calibration unit used t
Page 9 and 10: 2.2 BSMs for MMLS3 testing The inte
Page 11 and 12: Figure J.12: The side view of the b
Page 13 and 14: The set-up of the test before traff
Page 15 and 16: 3. TEST RESULTS The use of vinite o
Page 17 and 18: Table J.7: ITS results after wet an
Page 19 and 20: Table 11: Ravelling-depth after MML
Page 21 and 22: Table 15: Tensile Strength Retained
Page 23 and 24: The comparison of BSMs on Figure J.
Page 25 and 26: From Figure J.19 it can be seen tha
Page 27 and 28: 4.3 Saturation Level The moisture i
Page 29 and 30: Ravelling-Depth [mm 16 14 12 10 8 6
Page 31 and 32: From the study conducted in MIST de
Page 33 and 34: - No sign of significant initial de
Page 35: 5. BIBLIOGRAPHY ASPHALT ACADEMY. 20

Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II

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