养生条件对沥青混合料稳定度的影响

发布时间：2018-06-21 11:03

  本文选题：道路工程 + 沥青混合料　； 参考：《长安大学》2015年硕士论文

【摘要】：在各类常用的道路材料中,养生条件的设定通常只在水泥混凝土、水泥稳定碎石等水硬性胶结材料强度形成过程中有所考虑,而针对沥青混合料提出养生条件的问题还很少见。研究养生条件对于沥青混合料稳定度的影响不仅对于探究沥青混合料强度发展变化规律、完善相关试验规程具有重要的参考价值,而且对于温拌沥青在道路工程中的推广应用也具有积极作用。对于沥青混合料的养生条件,主要选择养生龄期和养生温度,稳定度主要考察马歇尔稳定度(MS)和车辙动稳定度(DS)。试验研究选用了ACMP1温拌沥青、SBS改性沥青和70#基质沥青,制备了AC-13C型沥青混合料,成型了马歇尔试件和车辙板试件,在不同龄期(1、3、5、7d)和不同温度(20、40、60℃)的组合条件下进行试件养生,测试了MS和DS。研究结果表明:传统热拌基质沥青混合料的稳定度对于养生条件(龄期和温度)具有独立性,而广义上的改性沥青(温拌沥青、SBS沥青)混合料的稳定度则对养生条件具有较为明显的依赖性,则可认为养生条件是通过影响改性剂的性能或存在状态来影响改性沥青混合料的稳定度,而对基质沥青本身几乎没有影响。总体表现为混合料的稳定度随着养生龄期的延长或养生温度的升高而增大,并逐渐趋于稳定。另外,养生龄期的影响作用较养生温度要更为明显一些。对比分析试验结果,发现SBS改性沥青混合料稳定度最高,而ACMP1温拌沥青混合料较低,但后者在适当养生条件下也能达到干线公路沥青路面对于稳定度的要求。
[Abstract]:In all kinds of common road materials, the setting of health condition is only considered in the process of strength formation of cement concrete, cement stabilized gravel and other hydraulic cementing materials, but it is rare to put forward health condition for asphalt mixture. The study of the influence of health condition on the stability of asphalt mixture is not only of great reference value for exploring the law of strength development of asphalt mixture, but also for perfecting the relevant test rules. Moreover, it also plays an active role in popularizing and applying warm mix asphalt in road engineering. For the health condition of asphalt mixture, the main choice is health age and temperature, and the stability of Marshall stability (MSN) and rutting stability (DSV) are mainly investigated. ACMP1 warm mix asphalt modified SBS and 70# base asphalt were used to prepare AC-13C asphalt mixture. Marshall specimen and rutting board specimen were formed. The specimens were kept in good health under the combined conditions of different ages and different temperatures (20 ~ 4060 鈩，

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