试件成型温度对沥青混合料马歇尔稳定度的影响 Influence of Compaction Temperature on Marshall Stability of Asphalt Mixture

为了定量研究试件成型温度对沥青混合料稳定度的影响，利用马歇尔击实试验平台，开展了沥青混合料的变温击实试验。研究选用了3种同品牌温拌沥青(ACMP1, ACMP2, ACMP3)和2种热拌沥青(70#基质、SBS改性)，制备了AC-13C型沥青混合料，变化不同的初始击实温度，成型了马歇尔试件，测试了试件的压实度和稳定度，分析了二者随击实温度的变化规律。结果表明：在击实温度90℃~150℃范围内，沥青混合料的压实度和稳定度随着击实温度的升高呈线性增长；稳定度也随着压实度的增加呈线性增长，符合传统试验结果；击实温度每变化10℃，会导致压实度约0.8%的变化和稳定度约1.7 kN的变化；试件成型温度严重影响着试件成型质量，从而影响着力学试验结果的有效性。 To quantitatively study the influence of compaction temperature on Marshall stability of bituminous mixture, a compaction test at different temperature was carried out in this study by applying the Marshall test. AC-13 bituminous mixtures were made by using 3 types of warm mix bitumen with the same brand (ACMP1, ACMP2, ACMP3) and 2 kinds of hot mix bitumen (70# base and SBS modified), the compactness and Marshall stability of Marshall samples were measured, and their variation rules with different compaction temperatures were analyzed. The research shows that compactness and Marshall stability of bituminous mixtures increase linearly with the increase of compaction temperature within 90˚C - 150˚C; the Marshall stability of bituminous mixtures increases linearly with the increase of compactness, and in accordance with traditional results; the variation of every 10˚C compaction temperature may make a difference of 0.8% for compactness and of 1.7 kN for Marshall stability; the compaction temperature greatly influences the samples quality and then the validity of mechanical test results.