Evaluation of Effect of Drainage Quality on Performance of Low Volume Roads in India
Keywords:
Low volume roads; Drainage quality; Pavement performance; RoughnessAbstract
Quality of drainage is important parameter to affect the performance of low volume roads. There are various problems associated due to inadequate road drainage system water remains on the roadway surface that can contribute to vehicle hydroplaning, in winter, standing water can freeze and cause skidding etc. results in frequent and premature deterioration in sub-grade, base/sub base as well as surface layers. In such cases, roads will need maintenance more often than a good quality drained road structure. These kinds of problems become more hazardous in case of low volume roads due to unpaved roads, less attention, poor ditches, poor cross slop etc. Low-volume roads make up 60 to 70 percentages of all roads worldwide. Adequate and timely maintenance of road drainage system is important parameter to improve the performance of low volume roads. Therefore there is a need to quantify the impact of quality of drainage on performance of low volume roads in India and identify critical maintenance components that affect drainage system. This study evaluate the effect of various drainage quality with traffic growth rate, and saturation time on performace of low volume roads in terms of roughness.The quality of drainage considered as per AASTHO guidelines to compute the Modified Structural Number (SNC). The computed SNC were used to predict the performance of low volume roads in terms of Roughness using deterioration models. Analysis and results indicated that rate of deterioration of the roads increases with the traffic growth rate, and saturation time and drainage quality. It is expected that this study will be useful for the road engineers to develop some strategies for adequate and timely maintenance of road drainage system to ensure performance of low volume roads
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