将现场取芯的沥青混合料试件真空饱水后长期放置于静水中,定期测定试件的吸水率,采用劈裂试验和冻融劈裂试验测定试件的劈裂强度和TSR,采用60℃劈裂试验及无侧限抗压强度试验测定粘结力和内摩擦角,运用两种拟合方法对沥青混合料粘结力和内摩擦角变化趋势进行拟合.结果表明,沥青混合料试件初期阶段吸水率迅速增加,后期水分进入微空隙,吸水率增加缓慢;长期静水作用下沥青混合料的劈裂强度和冻融劈裂强度比均下降,前6个月下降速率较大,后期逐渐变慢,前期的下降速率是后期的3～4倍.在长达12个月的静水作用下,沥青混合料粘结力下降0.08 MPa,呈线性变化;内摩擦角下降10.3°,呈二次抛物线变化.
The field cores drilled from the asphalt pavement are soaked for long time after vacuum saturation.Water absorption is tested every three months.The split strength and TSR of asphalt mixtures were measured by the split test.Moreover,the cohesion and internal friction angle of soaked mixtures were studied by the split and unconfined compression strength tests at 60 ℃.Two fitting methods are used to fit the trend of the change of cohesion and internal friction angle.The test results show that the water absorption of the soaked mixtures increased rapidly at early stage.But at later stage,moisture began to infiltrate into the micropores,resulting in the slow decrease of the water absorption.Under the long-term soaked duration,the split strength and TSR of asphalt mixtures all decreased.The decline rate of the first 6 months was larger,the latter gradually slowed down.The decline rate of the early stage was 3-4 times of the latter.With one year of immersion time,the cohe sion in the binder decreased 0.08 MPa,which approximately showed a linear change,and the internal friction angle decreased by 10.3 degrees,which gcncrally presented parabolic variation.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%