ABSTRACT

Upgrading, maintenance and rehabilitation of road infrastructure is expensive, especially in view of the growing scarcity and cost of suitable road building materials. In areas with high mica content and secondary minerals such as smectite in the natural materials, stabilisation with cement is not viable. The Council for Scientific and Industrial Research of South Africa has embarked on a research programme to evaluate the performance of substandard materials improved with anionic nano-silane modified bitumen emulsions for use in base and subbase layers. This work comprises laboratory testing as well as Accelerated Pavement Testing using the Heavy Vehicle Simulator (HVS). The results of a full-scale HVS test on a light pavement as well as initial analysis on a medium traffic road are discussed. It has been shown that stabilisation of available substandard materials using an anionic nano-silane modified bitumen emulsion compared with the standard approach of importing high quality crushed aggregate can lead to savings as high as 40%–50% for equivalent performance. In addition, there was also a significant reduction in construction effort and time.

摘要

道路基础设施的升级、维护和修复成本高昂，特别是考虑到合适的道路建筑材料日益稀缺和成本越来越高。在云母含量高和天然材料中的蒙脱石等次生矿物的地区，用水泥稳定是不可行的。南非科学和工业研究委员会已着手开展一项研究计划，以评估用阴离子纳米硅烷改性沥青乳液改进的用于基层和底基层的不合格材料的性能。这项工作包括实验室测试以及使用重型车辆模拟器 (HVS) 的加速路面测试。讨论了在轻型路面上进行全面 HVS 测试的结果以及在中等交通道路上进行的初步分析。研究表明，与进口高质量碎骨料的标准方法相比，使用阴离子纳米硅烷改性沥青乳液稳定可用的不合格材料可以节省高达 40%–50% 的同等性能。此外，还显着减少了施工工作量和时间。