30 June 2001
PROCEDURE FOR PREPARATION OF BITUMINOUS
G-1. SCOPE. This procedure describes the preparation of cylindrical specimens of bituminous
paving mixture suitable for dynamic modulus testing. The procedure is intended for densegraded
bituminous concrete mixture containing up to 25-millimeter (1-inch) maximum-size aggregate.
G-2. APPLICABLE STANDARDS. The following ASTM publications are applicable to this
procedure: D 1559, D 1560, and D 1561.
G-3. SPECIMENS. Approximately 4,000 grams of bituminous mixture should be prepared as
specified by ASTM D 1560. Cylindrical specimens should be 102 millimeters (4 inches) in diameter
by 203 millimeters (8 inches) in height.
a. Testing Apparatus. The apparatus used in preparing the specimens should be as specified by
ASTM D 1561, except that steel molding cylinders with 6.3-millimeter (1/4-inch) wall thickness
having an inside diameter of 102 millimeters (4 inches) and height of 254 millimeters (10 inches)
should be used.
b. Measurement System. The measurement system should consist of a two-channel
recorder, stress and strain measuring devices, and suitable signal amplification and excitation
equipment. The measurement system should have the capability for determining loading up to
13,344 Newtons (3,000 pounds) from a recording with a minimum sensitivity of 2 percent of the
test load per millimeter of chart paper. This system should also be capable of use in determining
strains over a range of full-scale recorder outputs from 300 to 5,000 microunits of strain. At the
highest sensitivity setting, the system should be able to display 4 microunits of strain or less per
millimeter on the recorder chart.
c. Recorder Amplitude. The recorder amplitude should be independent of frequency for tests
conducted up to 20 hertz.
d. Measurement of Axial Strain. The values of axial strain should be measured by bonding
two wire strain gauges at midheight opposite each other on the specimens. (The Baldwin Lima
Hamilton SR-4 Type A-1S 13 strain gauge has been found satisfactory for this purpose). The
gauges are wired in a wheatstone bridge circuit with two active gauges on the test specimen
exposed to the same environment as the test specimen. The temperature-compensating gauges
should be at the same position on the specimen as the active gauges. The sensitivity and type of
measurement device should be selected to provide the strain readout required above.
e. Load Measurements. Loads should be measured with an electronic load cell meeting
requirements for load and stress measurements above.