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true

防止沥青路面开裂

应对路面裂缝的原因

您最近一次在日常生活中仔细检查道路是什么时候? 可能有裂缝,无论是非常明显的大裂缝,还是小到看不见的小裂缝。

当温度发生变化,并且路面膨胀和收缩超出了粘合剂的拉伸或压缩能力,从而无法与路面移动保持一致时,就会出现裂缝。研究表明,通过在分子层面打造更具弹性的粘合剂,ELVALOY™ 反应性弹性体三元共聚物(RET)沥青改性剂可以防止冷裂纹和热裂纹。

弯梁试验证明了低温性能

美国联邦公路管理局(FHWA报告RD 02 075)研究了由弯梁流变仪(BBR)和热应力分析例程(TSARTM)提供的沥青粘合剂的裂解温度。由热应力约束试样(TSRST)提供的低温混合物属性用于验证这些沥青粘合剂试验。重点是评估含有聚合物改性沥青粘合剂的混合物的性能,这种沥青粘合剂具有相同的Superpave性能等级(PG)和类似的基础沥青,但具有不同的改性化学性质。ELVALOY™ RET在测试的花岗岩和石灰石骨料中广泛优于这些所测试的接枝SBS。


弯梁试验证明了低温性能

请查看下面的结果

沥青混合料名称 TSRST 断裂温度
  测试 1 测试 2 测试 3
STOA = 2 小时    
 ESI  -32.7  -31.9  -33.2
 ELVALOY  -31.3  -35.4  -34.3
SBS 线性接枝  -29.6  -34  -35.5
 EVA 接枝  -31.1  -25.8  -36.3
SBS 径向接枝  -32.2  -30.1   -29.1
 EVA  -29.6  -29  -30.4
 CMCRA  -28.6  -29.7  -28.4
 吹气  -26.3  -27.8  -27.8

轮迹带开裂:加拿大安大略省北部路面试验

皇后大学和安大略省交通运输部关于北安大略路面路面试验的论文评估了各种沥青粘合剂和混合物属性在预测自上而下疲劳开裂方面的现场性能的有效性。论文提到了安大略省蒂明斯以北的加拿大655号高速公路,其在2003年夏天进行了一次路面试验。将七个测试路面段(一个使用ELVALOY™)放置在两个升降机中,在新的颗粒材料上铺设总共90毫米的热混沥青。沥青粘合剂含量为5.2%。

2004年1月,5mm深度的路面温度两次达到-34ºC,这是一种非常罕见的情况。2005年初,空气温度六次达到-40ºC左右,而5mm深度的路面五次达到-30ºC以下。在经过第一个冬季之后观察到的损伤让我们深入了解了对横向和轮迹带开裂的减缓。

“第1段[ELVALOY™和第5-7段...表现非常好,没有出现早期损伤的迹象。...到目前为止,第1段和第5段几乎没有受到任何损坏...第1段,刚度最低,到目前为止还没有开裂,”研究专家写道。

比较八种沥青的故障周期,包括一种用ELVALOY™ RET制成的沥青

在这项疲劳破坏研究中使用了11种粘合剂。包括八种聚合物改性PG70-28粘合剂,使用了以下聚合物:ELVALOY™三元共聚物(RET)、苯乙烯-丁二烯-苯乙烯(SBS)线性接枝、SBS线性、SBS径向接枝、乙烯-乙酸乙烯酯(EVA)、EVA接枝、乙烯-苯乙烯共聚体(ESI)和化学改性的粒状橡胶。根据AASHTO临时试验方法TP8-94(10)进行弯梁疲劳试验。试验在应变受控模式下以1000微应变的高应变水平和19℃的试验温度进行。

比较了几种不同的数据分析方法,结果一致。用ELVALOY™ RET制成的混合物在疲劳破坏周期数方面的性能远超其他样品。

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