Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II

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Indirect Tensile strength (ITS) = 2000 xP π xDxt max Equation 1 ITS wet Tensile Strength Ratio (TSR) = x100 ITS dry Equation 2 Where: P max D t = maximum applied load, [N] = specimen diameter [mm] = average specimen height after MMLS test [mm] ITS wet = Indirect Tensile Strength at wet condition [kPa] ITS dry = Indirect Tensile Strength at dry condition [kPa] As shown in Figure J.16, the Indirect Tensile Strength test performed on MMLS specimen at room temperature (25ºC). Figure J.16: ITS test set-up on specimen after MMLS3 testing 14
3. TEST RESULTS The use of vinite or reinforced rubber mat minimises the direct abrasion of wheel on the specimens. However, during testing the vinite layer seen not prevent ravelling once the materials start disintegrating. The ingress of water into specimen under trafficking destroys cohesion of the mix resulting in loss of aggregate. Heaving along the edges of the wheel path is not a primary failure. Nevertheless, aggregate loss does prevail in the wheel path resulting into ravelling deformation. The ravelling depth is recorded on profilometer measurement on each BSMs. The results for Initial test and additional tests are presented in the following subsections: 3.1 Initial tests on BSMs Table 3: Ravelling-depth after MMLS3 trafficking on wet BSMs long cured specimen BSM-<strong>Mix</strong> type specimen (new labelling style) Preliminary specimen labelling style No of load repetitions 75 000 100 000 Ravelling-depth [mm] H+1C-E01 A1* 0.074 0.009 H+1C-E01 A2 0.073 0.003 H+1C-E01 A3 0.039 0.119 H+1C-E01 A4 0.002 0.079 H+1C-E01 A5 0.006 0.034 H+1C-E01 A6 0.031 0.068 H+1C-E01 A7 0.088 0.116 Average 0.045 0.061 Std 0.034 0.048 Cov 0.78 0.78 * A’s are preliminary labelling which changed to new format. 15
Page 1 and 2: APPENDIX J Technical Memorandum Upd
Page 3 and 4: findings of the moisture damage tha
Page 5 and 6: Figure J.4: The measuring wheel of
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: The set-up of the test before traff
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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