Show ROCK FOR HIGHWAY BUILDING first systematic efforts to determine value were made in french Labora Lab wy in 1878 the first systematic attempts to determine the value of rock for road building ding purposes by means of laboratory tests were made in france where in 1878 a road materials in ate rials lab oratory was ans founded in the french school of bridges and roads here the deval abrasion test was adopted and this test with slight modification has been accepted as standard throughout the united states the test Is named darned from its inventor it was first used lu in connection with con trat work in the city of paris many blany valuable data were collected in this laboratory on the hardness and toughness of rock roch and tests tor for these properties were developed which were to in principle the same as those in use today cods y |