Author(s) :

UCHE, O.A.U, MUHAMMAD, I.G.

Volume/Issue :

Abstract :

This paper reports an experimental investigation carried out to establish a mathematical relationship between aggregate crushing value (ACV) and ten percent fines aggregate crushing value (TFV) for some aggregates in Nigeria. Such a mathematical relationship, usually established through regression modelling on data collected, is useful in saving time and money cost on site through estimating one variable when another is known. The tests were performed in accordance with BS 812 (1990) part 110 and 111 on crushed granite, all-in-aggregate (or hoggin known locally as “burji”), river gravel and slag aggregates. The results obtained show that ACV value for aggregates are 25.04%, 22.70%, 36.13%,and 37.89% for crushed granite, slag , hoggin (all-in aggregate), and river gravel respectively. This show that the ACV test is not favourable in testing weak aggregates as the ACV is more than 30% for hoggin and river aggregates. This is consistent with BS 812:110 (1990). The TFV values for the aggregates are 180kN, 150kN, 120kN and 100kN for slag, crushed granite, hoggin and river aggregate respectively. A regression correlation of ACV and TFV shows that Nigerian aggregates can be related with an expression: ACV = 59.452 - 0.211TFV. With this relationship ACV values can be estimated for weaker aggregates than specified in the Nigerian General Specification for Roads and Bridges work. Hence weaker aggregates in construction industry may be rated accordingly.

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