A treatise on highway construction . ridot ite. . Quartzite Rhyolite. . .Sandstone. . Schist Shale Slag 15 46 1 4 9 71632211 34 Conglomerate. Diabase Diorite Dolomite Eclogite Pelsite Slate Plint Steatite Syenite 0 11 Gabbro Gneiss 87q. Resistance to Abrasion.—res< jor Hardness.—The resist-ance which rocks, bricks, and other materials offer to abrasion MATERIALS EMPLOYED IS THE COifSTKUCTIOlir OF PAVEMENTS. 49 without impact, as in the case of footway pavements, steps, andfloors, depends upon the h
A treatise on highway construction . ridot ite. . Quartzite Rhyolite. . .Sandstone. . Schist Shale Slag 15 46 1 4 9 71632211 34 Conglomerate. Diabase Diorite Dolomite Eclogite Pelsite Slate Plint Steatite Syenite 0 11 Gabbro Gneiss 87q. Resistance to Abrasion.—res< jor Hardness.—The resist-ance which rocks, bricks, and other materials offer to abrasion MATERIALS EMPLOYED IS THE COifSTKUCTIOlir OF PAVEMENTS. 49 without impact, as in the case of footway pavements, steps, andfloors, depends upon the hardness of the component particles. Thisproperty is measured by determining the amount worn away bygrinding during a given length of time. The first apparatus used forthis purpose was invented by a French engineer named Dorrey,and the test is commonly referred to as the Dorrey test. Theapparatus used in the U. S. Road Material-Laboratory and shownin Fig. A consists cf a circular cast-iron plate revolving horizontallycu31924004311928. 100
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