Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II

More documents

Recommendations

Info

in the specimen, which strengthens the mix. The specimen then covered with a plastic bag and sealed for two x 24 hours intervals so that no further moisture removed from the specimen at a temperature of 40ºC. This accelerated curing procedure is equivalent to 7 to 14 days in the field, (Malubila, 2005). 2.2.3 Cutting of specimens Following curing and cooling to ambient temperature, the specimens are ready for cutting. The cutting processes need attention and care, to minimise any damage to the specimen. The cutting of BSMs with additional of active filler is easier than BSMs without active filler. The latter mix is less cohesive and rather brittle, so spalling of the aggregate occurs if the wrong cutting technique is applied. The cutting of the BSMs without active filler is made easier by reducing the specimen temperatures in a fridge to below freezing. There are two types of blades that are used for cutting of the specimen. The slotted blades are for cutting the specimen into slices of 90mm. The continuous blade is more for trimming and delicate cutting. The dimensions of the specimen after compaction are 300mm tall with a diameter of 150mm. Each specimen is cut into slices of 90mm high. However, due to difficulties in cutting 300mm specimen, an alternative measures taken to compact two layers of 50mm and later trim the specimen to size indicated in Figure J.11 and Figure J.12. Figure J.11: The top view of the specimen before and plan for cutting The next step is to remove the sides of the specimen, so it can fit in the MMLS3 set-up. The diameter of the specimen is 150 mm and the sides of the specimen cut off to a size of 110mm, as illustrated in Figure J.12. 10
Figure J.12: The side view of the briquette before and after cutting. The cut briquettes placed in MMLS3 set-up and ready for test. Figure J.13 shows a photo of specimens after cutting. However, Briquettes of G2 materials suffered serious spalling during cutting. Figure J.13: Briquettes after cutting (G2-<strong>Materials</strong> and Quartzites-G4) Figure J.14: Proper cutting with minor damage on BSM-Emulsion (Quartzite Aggregates with No filler) Sample preparation i.e. mixing, compaction and cutting, plays a significant role in the mechanical testing of the BSM-specimen. Proper handling of BSM specimens during production 11
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: 2.2 BSMs for MMLS3 testing The inte
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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?