不同添加剂对沥青混合料低温性能影响研究

Study of the Influence of Different Additives to Asphalt Mixture's Low Temperature Performance

低温是造成沥青路面开裂的重要因素。通过不同材料破坏试验的应力-应变曲线求取应变能,并以弯曲应变能作为评价沥青低温性能的标准,同时以约束温度应力试验的结果验证评价结果的合理性。研究表明:采用弯曲应变能作为评价指标可以很好地表征材料的低温性能,并且与约束试件温度应力试验的结果基本吻合。

Low temperature is an important factor causing the asphalt pavement crack, it is necessary to research on the asphalt mixture low-temperature performance. It calculated strain energy by the stress-strain curves of curvature rupture test, then used curvature strain energy as an evaluation of the low-temperature performance of asphalt standards, and at the same time evaluated the reasonableness of the evaluation results by the thermal stress restrained specimen test results. It is found that curvature strain energy as an evaluation can be good indicators of low temperature performance characterization of materials whose result is almost the same with thermal stress restrained specimen test result.