Effect of percentage baghouse fines on the amount and type of anti-stripping agent required to control moisture sensitivity : final report.
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2003-06-30
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Edition:Final report, 7/01/2002-3/31/2003
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Abstract:This study investigated the effect of moisture and amount of baghouse fines on AC mixes. Two
types of baghouse fines, each with a different gradation, were used in varying concentrations to prepare
laboratory samples. The binder used was PG64-22 and the anti-strip additive used was LOF 6500.
TSR (AASHTO T283) test results showed a reduction in retained strength for specimens without
additive as compared to the specimens containing additive showing the effectiveness of the additive in
preventing the moisture damage. Mixes with highest amount of baghouse fines showed resistance to
moisture damage in presence of the anti-strip additive. However, absence of additive reduced the strength
ratio considerably to the point that these mixes would be unacceptable under current NCDOT criterion.
The mix performance was evaluated using the SST machine to determine the rutting and fatigue
characteristics of the mixes. In general, it was observed that moisture conditioning reduced rutting and
fatigue resistance of the mixes considerably, although, the TSR test result showed that an LOF-6500 antistrip
dosage of 0.5% was sufficient to reduce moisture damage to the point that the mixes would be
acceptable under the current NCDOT criterion of 85% retained strength.
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