A road embankment test section is being studied to assess the impact of fines content. A small test hole is made in the embankment from which an in situ sample was retrieved. The moist sample volume, mass, and specific gravity were determined as 510 cm3, 960 g, and Gs 2.70, respectively; the oven-dried sample mass was 804 g. A 500-g portion of the dried sample was used with a 275 cm3 mold to determine Yd(min) and emax The same portioned sample was then vibrated and compacted to a volume of 220 cm3 to find Yd(max) and emin What is the relative density of this sample? Comment on the result? GIVEN: m=910g ms = 804 g emax &min First find e: Gis 2.70 Wsms

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?