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10.7.2.3 Apply a repeated axial compressive load of 90 + 5 N static and 900 +<br />
25 N dynamic to the test specimen, in a haversine wave form with a load duration of 0.1 s<br />
and a rest period of 0.9 s between load pulses. Continuous application of the load is to occur<br />
throughout the hot conditioning cycle (i.e., 6 hours at 60°C).<br />
NOTE 8.--For<br />
open-graded mixes, the loads may need to be reduced.<br />
10.7.2.4 At the end of 8 hours, close the vacuum valve, open the bypass valve and<br />
open the system to atmospheric pressure. Continue to maintain the temperature setting of the<br />
environmental chamber at 25 + 0.5°C. Determine the ECS modulus as described in section<br />
10.3.<br />
NOTE 9.--For the modulus test, use the same loads that were initially established in section 10.3.<br />
10.7.2.5 Continue to maintain temperature setting of the environmental chamber at<br />
25 + 0.5°C and determine the coefficient of permeability of water flow as described in<br />
section 10.6.<br />
NOTE 10.--If excessive deformation (5 to 10%) of the specimen is experienced after the first hot cycle,<br />
terminate the conditioning.<br />
10.7.2.6 Begin a second hot conditioning cycle by repeating the procedure in sections<br />
10.7.2.1 to 10.7.2.5.<br />
10.7.2.7 Begin a third hot conditioning cycle by repeating the procedure in sections<br />
10.7.2.1 to 10.7.2.5.<br />
10.7.3 Cold Climate Conditioning<br />
10.7.3.1 Complete the three hot conditioning cycles as described in sections 10.7.1.<br />
to 10.7.2.7.<br />
10.7.3.2 Reduce the vacuum pressure to 250 + 25 mm Hg at the outlet gauge and<br />
reduce the water flow to 4 + 1 cm3/min. Turn off the load.<br />
10.7.3.3 Set the temperature of the environmental chamber to -18 + 0.5°C for<br />
6 hours + 5 min followed by a temperature of 25 + 0.5°C for at least 2 hours.<br />
10.7.3.4 At the end of the 8 hours, close the vacuum valve, open the bypass valve<br />
and open the system to atmospheric pressure. Continue to maintain the temperature setting of<br />
the environmental chamber at 25 + 0.5°C. Determine the ECS resilient modulus as<br />
described in section 10.3.<br />
10.7.3.5 Continue to maintain the temperature setting of the environmental chamber<br />
at 25 + 0.5°C and determine the coefficient of permeability of water flow as described in<br />
section 10.6.<br />
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