THE USE OF CRUSHED MACADAMIA SHELLS AS A PARTIAL REPLACEMENT COARSE AGGREGATE IN CONCRETE

Abstract
The author intends to investigate the performance of crushed macadamia shells based aggregates in concrete with a view of achieving the target compressive strengths specified in concrete mix design. The author will also explore the performance crushed macadamia shells based aggregates in comparison with the normal aggregates.
Macadamia shells are a waste product of the nut processing factories. With the increase of macadamia demand internationally; the macadamia nut farming is growing in the country. Local and international companies have set up with an aim to tap into this potential nut. The macadamia nut comprises of a nut which is inside a very hard woody shell. The shell is approximately 67% of the total weight of the whole nut.
The aim of the research project is to use crushed macadamia nut shells as a partial substitute of coarse aggregate and determine if there is an improvement on the performance of concrete. The use of macadamia nuts shells has been investigated though the shells used were not crushed to smaller sizes. The shells obtained, were cracked only to remove the nut inside thus still needed further crushing to obtain appropriate shape, texture and size. A previous investigation did crush the shells in any way and they were used as they were sourced from the factory.

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