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首页> 外文期刊>Current Journal of Applied Science and Technology >Flexible Pavement Assessment of SelectedHighways in Orolu Local GovernmentSouth - Western Nigeria
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Flexible Pavement Assessment of SelectedHighways in Orolu Local GovernmentSouth - Western Nigeria

机译：奥罗卢地方政府部分高速公路的灵活路面评估

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This research aim at investigating the flexible pavement performance of some selected Highways in Orolu Local Government area of Osun State, South-western Nigeria. In order to achieve this, the study involved interview sessions with relevant parties, administering of questionnaires, site observations, Pavement Condition Rating (PCR) was adopted to place a numerical value on the state of some selected roads and geotechnical investigative studies of the selected Highways. Laboratory determination of design parameters, namely Atterberg Limits, particle size distribution, California Bearing Ratio (CBR) and compaction were carried out in accordance with BS1377 (1997) method of soil testing for Civil Engineers. Thereafter, the soil samples that have been collected from failed portions of some of these roads to determine the structural integrity of the underlying soil strata were classified using AASHTO and USCS classifications. Compaction test with Maximum Dry Density MDD between 1730.02 kg/m~(3) - 1960 kg/m~(3) and Optimum Moisture Content OMC between 13.05%-20.0% were also carried out. The values of California Bearing Ratio (CBR) of soaked soil samples were within the range of 4.60% and 20.69, while un-soaked soil samples fall within the range of 10.13% to 65.07%, these results shows that samples T1, T3, T5, T7, T8, T9 and T10 are all good as subgrade materials, while samples T2, T4 and T6 are poor subgrade materials and they could have contributed to the failure of their roads: AFP4 (Kelebe road), AFP7 (Elder Akande road) and AFP9 (Ile- Olode road).The PCR values ranged from 61.28 and 100. The results of laboratory tests and field observation produced herein indicates that the failure of pavements in Orolu Local Government Area, Ifon-Osun, Osun State, South-western Nigeria can be attributed to the following: Poor or no design, infiltration of surface runoff into underlying course, growth of shrubs and lack of effective routine maintenance by the concerned agencies.
机译：这项研究旨在调查尼日利亚西南部Osun州Orolu地方政府区域的部分选定高速公路的柔性路面性能。为了实现这一目标，该研究涉及与相关方的访谈会议，问卷调查的管理，现场观察，路面状况等级（PCR）被用于在某些选定道路的状态和选定公路的岩土调查研究中放置一个数值。 。根据BS1377（1997）土木工程师的土壤测试方法，对设计参数进行实验室确定，这些参数即Atterberg限值，粒度分布，加利福尼亚承载比（CBR）和压实。此后，使用AASHTO和USCS分类对从某些道路的故障部分收集的土壤样品进行分类，以确定基础土壤地层的结构完整性。还进行了最大干密度MDD在1730.02 kg / m〜（3）-1960 kg / m〜（3）和最佳含水量OMC在13.05％-20.0％之间的压实试验。浸泡的土壤样品的加利福尼亚承载比（CBR）值在4.60％和20.69之间，而未浸泡的土壤样品的CBR值在10.13％至65.07％之间，这些结果表明样品T1，T3，T5 ，T7，T8，T9和T10都是好的路基材料，而样本T2，T4和T6则是劣质的路基材料，它们可能导致了道路故障：AFP4（Kelebe道路），AFP7（阿肯德老道） PCR值介于61.28和100之间。此处进行的实验室测试和现场观察结果表明，西南部奥芬州伊富奥森的奥罗卢地方政府区域的人行道损坏尼日利亚可归因于以下情况：设计不良或没有设计，地表径流渗入基础层，灌木生长以及有关机构缺乏有效的例行维护。

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