EFFECTS OF SALT FREEZE DAMAGE ON THE VISCOELASTIC PERFORMANCE OF ASPHALT MORTAR
EFFECTS OF SALT FREEZE DAMAGE ON THE VISCOELASTIC PERFORMANCE OF ASPHALT MORTAR
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盐冻损伤对沥青砂浆粘弹性性能的影响
DOI：
10.13168/cs.2017.0024
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发表时间：
2017-01-01
影响因子：
0.9
通讯作者：
Wang, Le
中科院分区：
文献类型：
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作者：
Cui, Yanan;Chen, Dongsheng;Wang, Le
在寒冷地区，由于冬季的低温和极端天气条件，道路路面经常被冰雪覆盖。除冰盐通常用于减少冰雪覆盖和清洁路面。然而，反复使用除冰盐可能会对由沥青砂浆和粗骨料混合制成的路面产生负面影响。本文讨论了盐冻环境下沥青砂浆的粘弹性性能。研究包括三个步骤。首先，对不同冻融循环下的沥青砂浆试件进行单轴蠕变试验。在此基础上，提出了含损伤因子的Burgers模型，以获得粘弹性参数。最后，利用扫描电子显微镜（SEM）研究了沥青砂浆的微观结构，并研究了冻融循环过程中沥青砂浆结构的变化。研究结果表明，不同盐浓度的冻融循环会对沥青砂浆造成损伤，改变沥青砂浆的粘弹性。结果表明，Burgers损伤模型比Burgers模型更能准确地反映沥青砂浆的蠕变。结果表明，寒冷地区有必要控制车辆超载，限制路面除冰盐用量。
In cold regions, road pavements are frequently covered by ice and snow because of low temperatures and extreme weather conditions during winter. Deicing salt is commonly used to reduce icing coverage and clean pavements. However, the repetitive use of deicing salt may have a negative impact on the pavements that are made from a mixture of asphalt mortar and coarse aggregate. This paper discusses the viscoelastic behavior of asphalt mortar in salt freezing environments. The study consists of three steps. First, uniaxial creep tests are conducted on asphalt mortar specimens under different freeze thaw cycles. Then, a Burgers model with a damage factor is proposed in order to obtain the viscoelastic parameters. Finally, scanning electron microscopy (SEM) is used to study the microstructure of asphalt mortar and to investigate the structural changes that take place during freeze-thaw cycles. The results of the study indicated that freeze-thaw cycles with different salt concentrations can damage asphalt mortar and change its viscoelastic properties. The Burgers damage model is shown to reflect the creep of asphalt mortar more accurately than the Burgers model. From the results, it can be concluded that it is necessary for cold regions to control vehicle overloading and limit the amount of deicing salt to be used on pavement.