Compliance to construction and materials specification results into a pavement structure capable of carrying the design traffic within the design period. Therefore, there is need to establish feasible option of improving the available gravel economically and timely to meet the contractual specifications without financial and time related contractual implications.

National Construction Authority, (2014) published a report pointing out critical issues that the construction industry in Kenya faces; a major problem they noted is the lack of skilled labor in the industry. 75% of the workforce in the industry is either unskilled or semiskilled, it states. This leads to substandard work and considering the high employer’s expectations, it is unacceptable. The report also sheds light on the shortage of skills in the industry especially in the sectors of welding, carpentry, painting works, plumbing, masonry and electrical works.

The project area of study is in Kenya`s central province Nairobi county Kamkunji constituency, it is along the ladhies road which connects Haile Selassie avenue and country bus station area ,It is located near the growing business zone Muthurwa market which is 12 hectare land owned by county government of Nairobi. The approximate population for the 7km radius is about 1,196,237, the coordinates of the area latitude=-1.2881 lat (DMS), longitude 36.8365 and altitude 5869.