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Full scale experiment on foam bitumen pavements in CAPTIF accelerated testing facility

机译：CAPTIF加速测试设施中泡沫沥青路面的全面试验

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Foam bitumen stabilization is a viable alternative for reducing aggregate consumption in New Zealand. An accelerated full-scale experiment on foam bitumen pavements was conducted in the Canterbury Accelerated Pavement Testing Indoor Facility as part of a Transit New Zealand research project to study the effects of foam bitumen on unbound granular materials. Six pavement sections were tested. Three were constructed with foam bitumen contents of 1.2%, 1.4%, and 2.8% and with a common active filler content of 1.0% cement. Two more pavements were constructed with adding cement only (1.0%) and foam bitumen only (2.2%). In addition, one control section with the untreated unbound material was tested. Strains were collected with a three-dimension Emu soil strain system installed in each pavement section. Results showed that surface deflections decreased at sections with higher bitumen contents. After the application of 5,710,000 equivalent standard axles, the control section and all sections that had been stabilized with cement only and bitumen only showed large amounts of rutting. Conversely, little rutting was observed in the three sections stabilized with 2.2% foam bitumen and 1.0% cement. Water was introduced into these three pavements with additional accelerated loading; this caused the section with the lowest foam bitumen content to fail. These results showed that foam bitumen and cement had a significant effect on improving the performance of the materials studied. Material samples taken for indirect tensile strength (ITS) and repeat load triaxial (RLT) for laboratory tests showed that the ITS test was a good predictor of the pavement performance and produced a clear trend, although RLT results were not conclusive.
机译：泡沫沥青稳定剂是减少新西兰总消费量的可行选择。作为新西兰运输研究项目的一部分，在坎特伯雷加速路面测试室内设施中进行了泡沫沥青路面的加速全尺寸试验，以研究泡沫沥青对未结合的粒状材料的影响。测试了六个路面部分。三种泡沫沥青的含量分别为1.2％，1.4％和2.8％，活性填料的平均含量为1.0％水泥。建造了另外两个人行道，仅添加水泥（1.0％）和仅添加泡沫沥青（2.2％）。另外，测试了具有未处理的未结合材料的一个对照切片。用安装在每个人行道区域的三维E土壤应变系统收集菌株。结果表明，沥青含量较高的断面的表面挠曲减小。在应用了5,710,000个等价的标准车轴后，控制部分和所有仅用水泥和沥青稳定的部分都显示出大量车辙。相反，在用2.2％泡沫沥青和1.0％水泥稳定的三个部分中几乎没有车辙。在额外的加速荷载下，将水引入这三个人行道。这导致泡沫沥青含量最低的部分失效。这些结果表明，泡沫沥青和水泥对改善所研究材料的性能具有显著作用。对材料的间接拉伸强度（ITS）和三轴重复载荷三重载荷（RLT）进行实验室测试表明，尽管RLT的结果尚无定论，但ITS测试可以很好地预测路面性能并产生明显的趋势。

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