753. Road Material Testing. [Newcomb, Edgar, and Assistants.]
Laboratory tests are made of both non-bituminous and bituminous
road materials. Broken stone, gravel, and slag are tested for specific
gravity, absorption, cementing power, toughness, and resistance to abrasion.
Bricks and paving blocks are submitted to the standard rattler
tests and absorption tests. Crude petroleums, bituminous emulsions, road
oils, asphalts, tars, and bituminous aggregates are investigated with relation
to the properties important for highway construction. (Winter.)
