Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, , Feb 23-27, 1920 . Fig. 24.—New York Testing Laboratory penetrometer. n. APPARATUS. (2) The container for holding the material to be tested shall be a flat-bottom, cylin-drical dish, 55 mm. (2^ inches) in diameter and 35 mm. (If inches) (Seefigs. 21 and 25.) (3) The needle 9 for this test shall be of cylindrical steel rod mm. (2 inches)long and having a diameter of mm. ( inch) and turned on one en
Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, , Feb 23-27, 1920 . Fig. 24.—New York Testing Laboratory penetrometer. n. APPARATUS. (2) The container for holding the material to be tested shall be a flat-bottom, cylin-drical dish, 55 mm. (2^ inches) in diameter and 35 mm. (If inches) (Seefigs. 21 and 25.) (3) The needle 9 for this test shall be of cylindrical steel rod mm. (2 inches)long and having a diameter of mm. ( inch) and turned on one end to asharp point having a taper of mm. (one-fourth inch). (1) The water bath shall be maintained at a temperature not varying more ° C. from 25° C. (77° F.) The volume of water shall be not less than 10 liters andthe sample shall be immersed to a depth of not less than 10 cm. (4 inches) and shallbe supported on a perforated shelf not less than 5 cm. (2 inches) from the bottom ofthe bath. 3 This requirement is fulfilled by the American Can gill style ointment box, deep pattern, 3-ouncecapacity. 9 It is recommended that the Roberts No. 2 parabola needle be used until s
Size: 1009px × 2477px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectroadmat, bookyear1921
