温拌剂不同使用方法对AC-13沥青混合料性能影响试验研究

Experimental Study on the Influence of Different Use Methods of Warm-Mixed Additive to the Performance of AC-13 Asphalt Mixture

为研究自研温拌剂L不同使用方法对沥青混合料性能的影响,对各混合料进行了压实特性、高温、水稳定性和低温性能试验,结果表明:1#WMA、2#WMA成型温度可降低25℃、40℃,压实特性与热拌混合料无异且动稳定度提高19.3%、13.1%;三组混合料马歇尔残留稳定度差别不大,但2#WMA的TSR明显更低并接近规范下限,建议以TSR作为水稳定性评价指标以策安全;以0#HMA为基准,1#WMA、2#WMA的弯拉破坏强度降低9.9%、29.9%,弯拉应变降低5.5%、26.2%;2#WMA的路用性能对低温敏感,混合料中可能残存的水分在低温下发生冻胀或是造成性能降低的主因;推荐温拌剂L的2#方法夏季高温时使用,1#方法冬季低温时使用。

In order to study the influence of different use methods of warm-mixed additive L on the perfor-mance of asphalt mixture, the tests of compaction characteristics, high temperature, water stability and low temperature properties to each mix were carried out, the results showed that: The forming temperature of 1#WMA and 2#WMA can be reduced by 25˚C and 40˚C, the compaction characteris-tics are the same as those of HMA, in the meantime, the dynamic stability increased by 19.3% and 13.1%;There was no significant difference in the residual stability of Marshall in the three mix-tures, however, the TSR of 2#WMA is significantly lower and close to the lower limit of the specifi-cation, It is suggested that TSR be used as the index of water stability evaluation to ensure safety;Based on 0#HMA, the flexural strength of 1#WMA and 2#WMA decreases by 9.9% and 29.9%, the bending strain decreased by 5.5% and 26.2%. The road performance of 2#WMA is sensitive to low temperature, The reason may be the possible residual moisture in the mixture will frost at low temperatures;It is suggested that 2# method of warm-mixed additive L should be used at high temperature in summer and 1# method at low temperature in winter.