Zheng Chuanfeng, Li Ruiming, Zou Linlin, Lv Dan, Xu Yazhi
College of Construction Engineering, Jilin University, Changchun 130026, China.
Materials (Basel). 2018 Jul 6;11(7):1155. doi: 10.3390/ma11071155.
This study analyzed the effects of the filler⁻bitumen interaction of the content and the meso powder characteristics of the mineral filler on the low-temperature performance of bitumen mastics. Control strategies for the mineral filler content (filler⁻bitumen ratio ()) were also determined. Panjin #90 bitumen and styrene⁻butadiene⁻styrene polymer-modified bitumen were used in the experiment. Four kinds of limestone powder were used, all of which satisfy the Chinese standard for powder particle size but exhibit different meso characteristics. Each kind of limestone powder was used to prepare bitumen mastic samples under five different . The meso voids in the unit mass () of the four kinds of mineral filler were tested on the basis of the principle of the Rigden void ratio. The fixed bitumen⁻free bitumen ratio in the bitumen mastic samples was determined using , bitumen density, and . The low-temperature cohesive strength of the bitumen mastics was used as the control index for critical failure, whereas variation rates of bending creep stiffness at low temperature were used as the control index for fatigue failure. Results showed that the effects of the filler⁻bitumen interaction of the content and the meso characteristics of the mineral filler are significant and such effects are determined by the fixed bitumen⁻free bitumen ratio. The optimal fixed bitumen⁻free bitumen ratio in the bitumen mastics under two low-temperature conditions (−30 °C and −10 °C) can be determined on the basis of the influence of the fixed bitumen⁻free bitumen ratio on the critical and the failure control indices. Moreover, can be obtained through reverse calculation. The mineral filler content can therefore be precisely controlled, which is crucial for the rational use of mineral filler and for the improvement of the pavement performance of bitumen mastics at low temperatures.
本研究分析了矿物填料的含量及细观粉末特性的填料⁻沥青相互作用对沥青玛蹄脂低温性能的影响。还确定了矿物填料含量（填料⁻沥青比（））的控制策略。实验采用盘锦#90沥青和苯乙烯⁻丁二烯⁻苯乙烯聚合物改性沥青。使用了四种石灰石粉，它们均符合中国的粉末粒度标准，但细观特性不同。每种石灰石粉在五种不同的 下用于制备沥青玛蹄脂样品。基于里格登空隙率原理测试了四种矿物填料单位质量（）中的细观空隙。利用 、沥青密度和 确定了沥青玛蹄脂样品中固定结合料⁻游离结合料的比例。将沥青玛蹄脂的低温粘结强度用作临界破坏的控制指标，而将低温下弯曲蠕变劲度的变化率用作疲劳破坏的控制指标。结果表明，矿物填料的含量及细观特性的填料⁻沥青相互作用影响显著，且这些影响由固定结合料⁻游离结合料比例决定。基于固定结合料⁻游离结合料比例对临界和破坏控制指标的影响，可以确定两种低温条件（−30℃和−10℃）下沥青玛蹄脂中的最佳固定结合料⁻游离结合料比例。此外，可通过反算得到 。因此，可以精确控制矿物填料含量，这对于合理使用矿物填料以及改善沥青玛蹄脂在低温下的路面性能至关重要。
