CT 306/Aashto R47 Reducing Samples Flashcards
The 3 basic sample reduction methods in R47 are the _______ method, the ___________method, and the __________method.
Mechanical, Quartering, and Incrimental
The mechancial splitter may be heated not to exceed the maximmum ______________ of the asphalt mixture.
Mixing (compaction) temperature
The minimum width of the individual chutes for type B mechanical splitter shall be aprox. ___________ larger that the largest particle to be split.
50%
When performing the Incremental Method:
A. Mix the material thoroughly by turning the sample over a minimum 4 times.
B. Roll the material into a cylindrical loaf and flatten the top.
C. Remove approx. 1/4 of the length of the loaf before obtaining a specimen.
D. All the above
D
When using the quartering method, the diameter of the flattened conical pile should be approx. ____________ times the thickness of the pile.
4-8 times
What should be applied to the mechanical spiltter before splitting?
Apply release agent.
What type of surface should quatering of HMA be performed on?
A hard, flat, non-stick surface, such as metal or sheeting
How many times should the HMA sample be mixed by turning the entire sample over before quartering?
A minimum of 4 times
After mixing the sample, what are the final steps before quartering the sample?
Create a conical pile by depositing each scoop or shovelful on top of the preceding one or by lifting both opposite corners of the paper, and then flatten the conical pile with a shovel or flat-bottom scoop.
To what dimension ratio should the conical pile of HMA be uniformly flattend to prior to quartering?
Diameter equal to about 4-8 times the thickness
What tools are acceptable for use when quartering an HMA sample?
Either a metal quartering template or a metal straightedge
When quartering, which portions should be removed and which should continue to be part of the quartering process?
Diagonal opposite quadrants should be removed, with the remaining quadrants combined to continue quartering.
