Subgrade Soil Stabilization Using Waste Engine Oil for Road Construction

Suye, Deribu; Fufa, Fekadu; Tesfaye, Abel

dc.contributor.author	Suye, Deribu
dc.contributor.author	Fufa, Fekadu
dc.contributor.author	Tesfaye, Abel
dc.date.accessioned	2022-12-22T08:02:50Z
dc.date.available	2022-12-22T08:02:50Z
dc.date.issued	2022-06-13
dc.identifier.uri	https://repository.ju.edu.et//handle/123456789/7567
dc.description.sponsorship	The cyclic wetting and drying process due to variation in moisture content of expansive soil causes vertical and horizontal movement which leading to failure of civil engineering structures especially road infrastructures construct on such soils. The problematic nature of such soils can be improved by employing different stabilization techniques and materials such as lime, cement and enzyme stabilization. However, as these techniques are expensive to developing countries such as Ethiopia, locally available low cost materials can be applied as alternative to improve the engineering properties of expansive soils. The aim of study is to investigate, the performance and suitability of waste engine oil to improve the problematic nature of expansive soils. This has a positive environmental effect as the cost of safe disposal of waste industrial material is significantly higher and there are strict environmental regulations. To achieve the objectives of the research, field investigation involved during dry season to identify the area of expansive soils and based on the properties that described under field investigations. The result from laboratory tests that natural subgrade soil obtained from the sample is characterized for its engineering and strength properties and it is found to be low expansive soil with low bearing capacity, low swell and characterized as A-7-6 according to the AASHTO and CL (lean clay) according to ASTM soil classification system and rated as unsuitable subgrade materials. The soil was stabilized with waste engine oil with 2, 4, 6 and 8%. The laboratory tests carried out to evaluate the stabilized soil sample were; Atterberg limits, compaction and CBR tests. With the higher percentage of waste engine oil (8%), LL reduced from 41 to 36.5%, PI reduced from 19 to 12.06% and CBR decreased from 2.65 to 1.94%, but for 4% of WEO CBR increased to 4.26% and the CBR swell reduced from 9.46 to 2.5% for 4%WEO. Thus, waste engine oil can be recommended as an alternative stabilizing agent for expansive soils for maximum of 4% by itself or being blended with small percentage of effective stabilizing agents such as lime or cement so that significant project cost reduction and minimal environmental degradation can be assured	en_US
dc.language.iso	en_US	en_US
dc.subject	Atterberg limits	en_US
dc.subject	CBR	en_US
dc.subject	expansive soil	en_US
dc.subject	waste engine oil	en_US
dc.subject	MDD	en_US
dc.subject	OMC	en_US
dc.title	Subgrade Soil Stabilization Using Waste Engine Oil for Road Construction	en_US
dc.type	Thesis	en_US