Downloaded from https://www.everyspec.com Mlb4TD-620A la huoq ?- Method 104 -. MEASUREMENT OF REDUCTION IN MARSHALL STABXIXW OF BITUMINOUS PAWIMENTS CAUSED BY IMMERSION IN WATER 1 1. SCOPE 3. SPECIMENS 1.1 This test method is intended to measure the reduction in ~Marshall stability resulting from the action of water on com- pacted bituminous mixtures containing pene- tration grade asphalt, tar, or rubberized tar.
A numerical index of reduced stability is obtained by comparing the stability of specimens determined in accordance with usual Marshall procedures with the stability of specimens that have been immersed in 3.1 A minimum of eight standard Mar- shall test specimens, 4 in, in diameter and 21/2 inches Y in. in height, shall be pre- pared for each test in accordance with the procedures described in method 100. The compaction effort used shall be 50 blows on each end of the specimen. 4. PROCEDURE water for a prescribed period. 4.1 Weigh each test specimen in air and in water. 2 APPARATUS 2.1 Water bath. A water bath at least 6 4,2 Calculate the specific gravity of each test specimen as follows:
inches deep provided with mechaniwl W~~- ter agitator, heating elements, and thermo- static controls capable of maintaining the bath water at ternpwatures ranging from 100° to 140° F, The bath shall have a perforated false bottom or be equipped with a shelf for supporting specimens 2 inches above the bottom of the bath. A Specific gravity = .q _ ~ where A= weight of specimen in air, g 2.2 Balance and ~vater container with accessory equipment for weighing the test B = weight of specimen in water, g specimens in air and in water, 4.3 Sort the test specimens into two groups so that the average specific gravity of the specimens in group 1 is essentially the same as that of group 2.
2.3 Transfer plates, flat, of glass or metal. One of these plates shall be kept under each test specimen during immersion and subsequent handling, except when weighing and testing, in order to prevent breakage or distortion of the specimens. 4.4 Test the specimens in group 1 for Marshall stability and flow as described in method 10. In POM On ASTM D 1076, standard Me!hod of Twt for CR.,.! of WIII. r on Cohalon of COmpuetd Method 104 33