INVESTIGATING THE EFFECTS OF THE REPLACEMENT OF SAND WITH QUARRY DUST ON THE PROPERTIES OF CONCRETE

ABSTRACT.
This investigation aims to come up with a mix proportion for concrete class 25 by the use of
quarry dust instead of normal river sand for concrete mix.
Kenya has currently undertaken a major initiative on development of infrastructures such as
express highways, power projects, industrial structures, the construction of buildings and
other structures, in order to meet the requirements of globalization in its Vision2030.
Concrete plays the key role towards this development and a large quantum of concrete is
being utilized in every construction practice. River sand, which is one of the major
constituents used in the production of concrete, has become very expensive and also
becoming scarce due to the depletion of river beds. Quarry dust is a waste obtained during the
quarrying process. Quarry dust has very recently gained good attention to be used as an
effective filler material instead of sand. The use of quarry dust as a fine aggregate decreases
the cost of concrete production in terms of the complete replacement and even partial
replacement of natural river sand.

The environmental impact of river sand mining on river beds, the expensive and rising cost of
manufactured sand, the cheap and good accessibility of quarry dust, are the main motivations
behind the undertaking of such a project.
This research will report the experimental study which investigates the proportion by weight
of quarry dust to acquire similar concrete strength with 20%, 40%, 60%, 80% and 100%
river sand replacement. The focus of this research will only be concrete class 25.

 

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