静水作用下沥青混合料强度衰减规律

发布时间：2018-03-18 02:30

  本文选题：道路工程　切入点：沥青混合料　出处：《功能材料》2017年04期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The bituminous mixture samples taken from the field were filled with water in vacuum and placed in still water for a long time, and the water absorption rate of the samples was measured periodically. The splitting strength and TSRs of the specimens were measured by splitting test and freeze-thaw splitting test, and the bonding force and internal friction angle were measured by splitting test at 60 鈩，

本文编号：1627624