SHRP-A-379 traducir

Temperature Measurementand Control
Range: -10°C to 80°C
Resolution: 0.25 °C
Accuracy: + 0.5 °C
3.2 Platen-Specimen Assembly Device (figure 2)--This device is used to facilitate
bonding of the specimen to loading platens. The device maintains the platens in a parallel
position (relative to each other) when the specimen is glued to them. The platens must be
parallel so that stresses do not develop in the specimen when the specimen-platen assembly is
clamped in the test system.
3.3 Miscellaneous Apparatus and Materials:
3.3.1 calipers for measuring specimen height and diameter;
3.3.2 aluminum loading platens;
3.3.3 quick-set adhesive with a minimum hardened stiffness modulus of 2,070 MPa
for bonding platens to specimen ends;
3.3.4 rubber membrane for uniform application of confining pressure;
3.3.5 silicone sealant to seal membrane against platens;
3.3.6 O-rings to secure ends of rubber membrane on platens;
3.3.7 6-mm diameter plastic tube to be inserted between membrane and specimen so
as to relieve any internal air pressure;
3.3.8 device(s) for mounting LVDTs.
4. TEST SPECIMENS
4.1 Compact Asphalt Concrete Specimens--Specimens should be compacted in
accordance with procedures outlined in section 2.2. Specimen dimensions should be 150 mm
in diameter and 50 to 65 mm in height for mixes containing a maximum aggregate size of
19 mm or less. i
4.2 Measure Specimen Size--Measure the height and diameter of the specimen at
three different points around its perimeter and report to the nearest 0.025 mm. Average the
three measurements and report to the nearest 0.25 mm.
lit is recommended that specimen dimensions be 200 mm in diameter by 75 mm in height for mixes containing a
maximum aggregate size greater than 38 mm.
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