应用马歇尔试验法对添加不同Sasobit剂量的普通AC-13C型沥青混合料进行了体积参数分析,以Sasobit沥青混合料的空隙率达到普通沥青混合料的空隙率(4.5%)为控制指标,以Sasobit沥青混合料稳定度相对于普通沥青混合料稳定度提高幅度最大为辅助指标,确定了Sasobit沥青混合料的最佳击实温度为130℃和最佳Sasobit剂量为3%。利用车辙试验、低温小梁试验、冻融劈裂试验和浸水马歇尔试验对加入3%Sasobit的沥青混合料以及同级配普通沥青混合料的性能进行了对比测试,研究了Sasobit对沥青混合料路用性能的影响。分析结果表明:相对于普通沥青混合料,Sasobit沥青混合料的击实温度虽然降低了20℃,但高温稳定性却有明显提高,动稳定度是普通沥青混合料的3倍;Sasobit沥青混合料的低温抗裂性与水稳定性低于普通沥青混合料,但下降幅度不明显。
The volume parameters of AC-13C asphalt mixtures with different Sasobit contents were analyzed by Marshall test method.The control index was that the porosity of Sasobit asphalt mixture was equal to the porosity of ordinary asphalt mixture(4.5%).The secondary index was that the improvement of dynamic stability for Sasobit asphalt mixture was maximum relative to ordinary asphalt mixture.The optimal compaction temperature and Sasobit content were determined according to the two indices,which were 130 ℃ and 3% respectively. The performances of different AC-13C asphalt mixtures with 3% Sasobit and without Sasobit were compared by rutting test, low-temperature bending-beam test, frost thawing and splitting test, immersion Marshall test respectively, and the influence of Sasobit was analyzed. Analysis result shows that compared with ordinary asphalt mixture, the compaction temperature of Sasobit asphalt mixture decreases by 20 ℃, but its high-temperature stability rises, and its dynamic stability increases by 3 times. Its low-temperature anti-crack ability and moisture stability are lower, but the diminutions are unconspicuous. 9 tabs, 1 fig, 11 refs.