Engineering Assessment of Aggregates for Road Projects in Selected Valleys within Bahr Al-Najaf Depression-Middle of Iraq

The progress of urban and economic growth in Iraq necessitates the enlargement of civil infrastructure, which includes the establishment of road networks to enhance intercity connections. To fulfil these requirements, it is crucial to guarantee the accessibility of raw materials that conform to authorized international and local standards. Therefore, this study aims to undertake an engineering evaluation of the aggregate resources and assess their compatibility with both local and international specifications. The ultimate goal is to ascertain their suitability for utilization in road engineering and construction projects, thereby contributing to the ongoing development efforts in the region. This study comprehensively examined the physical, chemical, and engineering properties of aggregate deposits in the Al-Malah, Abu Khemsat, and Al-Rahimawi valleys situated at the Bahr Al-Najaf depression. Samples were collected from 10 sites in Al-Maleh, 5 stations in Abu Khemsat, and 5 stations in the Al-Rahimawi valleys. Grain size analysis indicated that the sub-base material falls within the specified limits outlined in the Iraqi Standards for Roads and Bridges. Numerous tests were conducted, including mechanical corrosion, compaction test, Atterberg limits, and chemical analysis. It is required to discuss these results briefly to affirm that the studied aggregates meet the requirements outlined in global specifications for engineering projects, particularly in the construction of roads. To obtain aggregates within the approved standard, some corrections must be made for it.