Browsing by Author "S.O. Abdulraman"

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    CORRELATION OF BLASTING PERFORMANCE WITH LOADING AND CRUSHING TIME TO MINIMIZE ENERGY CONSUMPTION
    (2020) Olanrewaju Alaba; S.O. Abdulraman
    Blasting performance with loading and crushing time were correlated in order to minimize energy consumption in quarry operation. A measure scaled object was placed within the muck pile of blasted rock fragments. Digital camera was used to take the photograph of the scaled object and the blasted rock fragments before the commencement of loading and crushing operations. The data collected were subjected to fragmentation analysis using split desktop App while the correlation analyses were carried with Microsoft Excel App. The fragmentation and distribution analysis showed that the fine cut off sizes are 8.75 cm, 9.55 cm, 7.58 cm, 8.58 cm and 11.75 cm while their mean size distribution are 35.99 cm, 10.25 cm, 24.86 cm, 16.78 cm and 16.10 cm respectively. The R squared values (R2) obtained during the correlation of digging time with size of fragmentation passes (P50), mean deviation and bucket passes were given as 0.94, 0.39 and 0.63 with p-values of 0.00, 0.34 and 0.82 respectively. Consequently, the R2 values during the correlation of crushing time with P50, mean deviation and range were specified as 0.64, 0.62 and 0.27 with p-values of 0.00, 0.11 and 0.07 respectively. The study therefore established that only the regression equation for P50 is statistically significant while statistically insignificant for mean deviation, range and number of bucket passes.
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    Suitability of cow horn as filler in an epoxy composite
    (2019) I.O. Ambali; Y.L. Shuaib-Babata; T.O. Alasi; I.N. Aremu; H.K. Ibrahim; Z.U. Elakhame; S.O. Abdulraman
    This study focuses on assessment of cow horn as filler in an epoxy composite. A particle-reinforced composite was developed using horn particles (HP) and epoxy resin with filler of varying percentage weight (5%, 10%, 15%, 20%. 25%, 30%, 35%, 40 %) at particle sizes of 100 and 150 μm. The composites were developed by hand lay-up technique with varying process parameters. The properties of the developed composites were examined through tensile, flexural and impact tests. The results showed that the tensile properties of the polymers reduced with the incorporation of the cow horn as filler. But at higher curing temperature, a better strength was achieved. Meanwhile, the flexural and impact properties of the polymers increased with the incorporation of the fiber in no particular order. The composite materials with particle size of 100 μm with curing temperature of 80oC exhibited higher tensile (37.58 MPa) and impact properties (74 J) than the lower particles. Generally, the cow horn was found to be a good potential filler in the composite if prepared using higher curing temperature as exhibited through its mechanical properties.