During reconstruction or removal of a road surface, reclaimed asphalt pavement (RAP) is commonly obtained by milling or removing the. existing pavement. For this study, reclaimed asphalt pavement (RAP) is defined as all. asphalt road waste, large chunks or milled material, that has been size-reduced, making it. reusable as part of a new asphalt mixture. Reclaimed asphalt pavement has been successfully re-used and recycled for many.
The eartubes are the metal/steel parts of the stethoscope that connect to the eartips and the synthetic/PVC tubing, which connects to the stem of the chest-piece. The eartubes are designed to to isolate and transfer sound to the users ears with minimum quality loss.
The sound depends on whether you are using the bell or the diaphragm and also on the pressure you put on the chest piece.   Breathing is best heard with the diaphragm, or flat side of the stethoscope.    The diaphragm is used to listen to high pitch sound while the bell is used to listen to low pitch sounds.However, if you put pressure on the bell, it will pick up higher pitch sounds.he best stethoscopes have a tube for each ear piece rather than a single tube. Also, the best tubing is thick, short, and â¦ relatively stiff, with a small bore. Also, make sure that tubing is free of leaks.  2) find relatively quit area to ensure that the body sounds are not overpowered by backround nois.......