INVESTIGATION ON THE ENGINEERING PROPERTIES OF COARSE AGGREGATE LOCALLY AVAILABLE IN GARISSA COUNTY

ABSTRACT
One of the development goals of Kenya’s Vision 2030 is to provide affordable housing to all people. This
can only be achieved by using locally available coarse aggregates in concrete production. In Garissa
County, the locally available coarse aggregate which is quartz has been identified and over sometime has
been used in construction as building block. Over time, as streams and seasonal rivers cut down into Tana
River, they leave behind large flat terraces, usually made up of sand and gravel. These terraces are often
our main source of aggregate. There are no studies carried out to be establish the properties of these
aggregates which may pave way for their use in large scale project too. Therefore, the main objective of
this project is to determine the physical properties these aggregates and their suitability in concrete
production.
This locally available aggregates in Garissa County has a specific gravity of 2.62 which confirms that
indeed they are quartz. They are smooth and hard, having Aggregate crushing value of 26.8%. From there
smooth texture is clear these aggregates have travelled long distance and are transported through water
bodies.

 

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