SHRP-A-379 traducir

D 1561-81a Preparation of Bituminous Mix Test Specimens by Means of California
Kneading Compactor
D 2041-78 Test Method for Theoretical Maximum Specific Gravity of Bituminous Paving
Mixtures
D 2493-91 Standard Viscosity Temperature Chart for Asphalts
3. APPARATUS
3.1 Rolling Wheel Compactor--A mechanical, self-propelled rolling wheel compactor
with forward/reverse control such as that shown in figure 1 for compaction of asphalt
concrete mixtures. It must weigh a minimum of 1,000 kg and possess the capability of
increasing the weight to 1,500 kg. The load applied must be in the static mode.
3.2 Mold--A mold to hold the bituminous mix as shown in figure 2. The mold is
composed of one lift 101.6 mm thick.
3.3 Ovens--Forced-draft electric ovens of sufficient size, capable of maintaining a
uniform temperature between 100 + 3°C and 200 4- 3°C. It is preferable to have ovens with
a capacity of 2.8 x 10-2 m3 to 4.2 × 10-2 m 3 for asphalts and 0.7 m 3 to 0.85 m 3 for
aggregates.
3.4 Specimen Mixing Apparatus--Suitable mechanized mixing equipment is required
for mixing the aggregate and the bituminous material. It must be capable of maintaining the
bituminous mixture at the selected mixing temperature, and allow the aggregate to be
uniformly and completely coated with asphalt during the mixing period (approximately
4 min). It is preferable to have a mixer with a capacity of 7 x 10-2 m 3 to 8.5 × 10-2 m3. A
conventional concrete mixer fitted with infrared propane heaters has been found to be
suitable.
3.5 Coring and Saw Cutting Equipment--Mechanized coring and saw cutting
equipment capable of coring specimens 101.6 mm to 203.2 mm in diameter and beams of
different sizes from an asphalt concrete slab. It is preferable to dry-cut the cores and beams.
3.6 Balance--Two balances are required: one with a capacity of 5 kg or more and
sensitive to 1.0 g or less, and the other with a capacity between 45 and 120 kg, and sensitive
to 0.5 kg or less.
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3.7 Miscellaneous Apparatus:
3.7.1 Digital thermometers with thermocouple probe
3.7.2 Spatulas, trowels, scoops, spades, rakes
3.7.3 Heat-resistant gloves