LAWAL Abiodun Ismail (Publications)
Publisher Journal Of Scientific Research (Geomaterial)
Publication Type Journal
Publication Title Optimization Of Blasting Parameters Using Regression Models In Ratcon And NSCE Granite Quarries, Ibadan, Oyo State Nigeria
Publication Authors Akande, J. M. and Lawal, A. I.
Year Published 2013

This research examines optimization of blasting parameters for economic production of granite aggregates in Ratcon and NSCE quarries located at Ibadan, Oyo State. Samples were collected from the study areas for the determination of rock density and porosity. Schmidt hammer was used for in situ determination of rock hardness. Uniaxial compressive strength of in situ rock was estimated from the values obtained from Schmidt hammer rebound hardness test and density determined from laboratory test. Blasting data were collected from the study areas for optimization. Multiple regression analysis using computer aided solution SPSS (Statistical Package for the Social Sciences) was used to analyse data obtained from the laboratory test, field test and the study areas. The estimated mean uniaxial compressive strength value of NSCE is 240 MPa and that of Ratcon is 200 MPa and their average densities and average porosities are 2.63 g/cm3, 2.55 g/cm3, 1.88% and 2.25% respectively. Eleven parameters were input into the multiple regression analysis to gener- ate the models. Two parameters out of eleven input parameters such as geometric volume of blast (Y1) and number of boulders generated after blasting (Y2) were dependent variables and the remaining nine such as X1 (Drill hole diameter), X2 (Drill hole depth), X3 (Spacing), X4 (Burden), X5 (Average charge per hole), X6 (Rock density), X7 (Porosity), X8 (Uniaxial compressive strength) and X9 (Specific charge) were input as independent variables. The results of the mod- els show that out of the nine independent variables seven of them that is X1 (Borehole diameter), X2 (Borehole depth), X3 (Spacing), X4 (Burden), X5 (Average charge per hole), X8 (Uniaxial compressive strength) and X9 (Specific charge) have significant contribution to the models while X6 (Rock Density) and X7 (Porosity) have insignificant contribution they are therefore automatically deleted by the SPSS. The result of the models developed for the optimization reveals that blasting number 5 gives the required product at lowest possible cost. From the result, the cost of secondary blasting has been reduced and volume of the blasted rock has been increased with low cost of explosives, the parameters that give this result have been chosen as optimum parameters.

Publisher Civil And Environmental Research
Publication Type Journal
Publication Title Environmental Effects Of Processing Marine Clay In Olotu, Ondo State
Publication Authors J. M. Akande, E.O. Ajaka, F. M. Omosogbe and A. I. Lawal
Year Published 2013

In this work, analysis of the released gas from calcined marine clay and lime shell was investigated. Study of the
emitted gas/air from the calcined clay and shell showed that average concentration of carbon dioxide (CO2:
20.09PPM and 8.12PPM) are below the maximum standard natural concentration 600PPM of carbon dioxide in fresh
air and the recommended World Health Organization Threshold Limit Value (TLV) of 500PPM. Average carbon
monoxide (CO) concentration (0.004PPM, 0.010PPM) and sulfur dioxide (SO2) concentration (0.002PPM are below
the Nigeria Ambient Air Quality Standards (NAAQS) and World Health Organization (WHO) maximum limit of
10PPM-20PPM (for carbon monoxide) and 0.01PPM- 0.5PPM (for sulfur dioxide) for an 8-hourly time. It was
established that the average concentration of C0, C02, and S02 is so low and so pose no threat to the environment
based on the review of the existing regulation, standards and codes (WHO and NAAQSO).

Publisher International Journal Of Engineering And Technology ©Science Publishing Corporation
Publication Type Journal
Publication Title Effects Of Controllable Blasting Variables On Number Of Boulders Generated After Blasting In Ratcon And NSCE Quarries, Ibadan, Oyo State, Nigeria.
Publication Authors (4) J.M. Akande and A.I. Lawal
Year Published 2013

The research work examines the effects of controllable blasting variables on number of boulders generated after blasting. The objective of the research was achieved through collection of data related to blasting which are drill hole depth, drill hole diameter, burden, spacing, average charge per hole, and specific charge. The collected data were analysed statistically using both Microsoft Excel Software and SPSS Software. The result of the analysis reveals that all the input controllable blasting variables which are drill hole diameter (X1), drill hole depth (X2), hole spacing (X3), burden (X4), average charge per hole (X5), specific charge(X6) that participated as independent variables in the models are found to be significant and the R2 values obtained from the graph show a very strong correlation between the number of boulders generated after blasting and the input variables except that of drill hole diameter which shows a very weak correlation. The equation generated using the SPSS could be used to determine number of boulders generated after blasting.

Publisher Journal Of Environment And Earth Science
Publication Type Journal
Publication Title Evaluation Of The Environmental Effects Of The Abandoned Quarries Strabag Quarry At Ibadan, Nigeria And RCC Quarry At Wasinmi, Ikire, Nigeria
Publication Authors J. M. Akande, A. I. Lawal, and Adeboye, W. A.
Year Published 2013

The research work evaluates the environmental effects of the abandoned quarries Strabag and RCC quarries. Soil
samples were collected at different locations in and around the study areas and water samples were also col
for the laboratory analysis. Soil samples were analysed for the determination of macronutrients and
micronutrients while water samples were analysed for determination of chemical parameters such as pH, Fe, Cr,
Si, K+, Na+, Ca++, Mg++, CC-, SO4, NO3- and water hardness in triplicate.The laboratory test results and data
collected were subjected to analysis of variance (ANOVA) and the Turkey’s test was used to verify the
significant differences among treatment means at the 5% probability level. Linear correlation and regression
analysis between soil and water parameters (Y) and the distance from quarry (X) was performed using Microsoft
Excel. The results obtained revealed that most of the deficiencies observed in chemical analysis of soil and
water samples from the studied areas have no direct link with previous mining operation in the areas. It was also
revealed from the findings that abandoned quarries (granite) have more of physical constraints than the chemical

Publisher International Journal Of Engineering And Technology, UK
Publication Type Journal
Publication Title Evaluation Of Explosives Performances On Granite, Calcite And Dolomitic Marble.
Publication Authors M. A. Saliu, A. I. Lawal and A. F. Akindoyeni
Year Published 2013

The study investigates the performance of different explosives on some selected rock types. To achieve the set objectives, field measurements were conducted using scanline method and clinometers for determining discontinuity spacing and dip, dip direction of discontinuities respectively in Julius Dinga Ltd Iyuku, Geoworks Ltd Igarra and Freedom quarry Ikpeshi all in Akoko-Edo in Edo State of Nigeria. In general there are two sub-vertical joints with the following dips and dip directions, for Julius Dinga Nigeria Iyuku granite are 85 and 344 , 85 and 317 , for Geoworks Igarra calcitic marble are 85 and 041 , 84 and 056 and for Freedom Ikpeshi dolomitic marble are 86 and 321 , 82 and 041 respectively. The in situ block size distribution was also estimated using both empirical and AutoCAD©. Joint spacing, block volume and volumetric joint count methods were used for empirical block size estimation. Four different types of explosives that is Special gelatine, Emulsion, Slurry and ANFO were used to carry out four blasting operations each on three types of rock selected. Out of the four explosives used, Special gelatine is the most efficient explosive for blasting of granite with efficiency of 64% and over efficient for other types of rock that is it turn them to powder, Emulsion is found the most efficient explosive for blasting of calcitic marble with efficiency of 62%, Slurry is the most efficient explosive for blasting of dolomitic marble with efficiency of 64% and ANFO is found inefficient for all selected rocks except to be used as low explosive combined with other higher explosive.

Publisher International Journal Of Engineering And Applied Science
Publication Type Journal
Publication Title Design Of A Haulage Way In An Underground Coal Mine
Publication Authors Akande, J.M. and A. I. Lawal
Year Published 2014

The research work examines the design of a haulage way in an underground coal mine in Enugu, Nigeria. To achieve the set objectives the following factors were put into consideration: angle of dip of the deposit, condition of the roof and floor, hydro-geological condition, seam thickness. The design of the haulage way was carried out based on the geological characteristics of the area. In the design of the haulage way, rigid arch support was selected to control the roof and has a span or width of 3.65 m, height of 1.20 m and 1.3 m spacing between the arches. The pressure load (5.931t/m), maximum moment is (-2.64 t.m) and absolute stress value (14000 t/m2) were determined using practical formulae.

Publisher Journal Of Mining World Express
Publication Type Journal
Publication Title Investigation Of Weathering Effects On Engineering Properties Of Supare Granite Gneiss
Publication Authors M. A. Saliu, and A. I. Lawal
Year Published 2014

Weathering and alteration in granite‐gneiss has a deep impact on both the physical and mechanical properties of the
rock. To investigate the impacts of weathering on engineering properties of granite gneiss, three samples each of weathered and un‐weathered granite gneiss were collected from Supare. The collected samples were prepared in the laboratory for the determination of physicomechanical properties of weathered and un‐weathered rock samples. From the results of the analysis, weathered sample has average uni‐axial compressive strength (UCS) value of 128 MPa while the Un‐weathered indicated a UCS of 166 MPa. The Water Absorption for the weathered sample is 0.19 % while the Un‐weathered is 0.11 %. The deformation characteristics of the rock sample for weathered and fresh rock were studied and result showed that the peak strain at failure is 5.11× 103 for the weathered sample and the Unweathered is 4.53×103. The result of the testing confirm that the degree of weathering and the associated changes in the physico‐mechanical properties of the granite‐gneiss is directly related to the reduction in Uniaxial Compressive Strength, Point Load Index, Abrassion Resistance and Absorption of the weathered samples. The mode of failure of the rock has been found to be influenced by weathering extent in the rocks. The Un‐weathered sample showed a brittle fracture at failure while the weathered showed a ductile behaviour. The study revealed that deformation characteristics are important characteristics for assessment of the behaviour of weathered granite‐gneiss rock and thus for its suitability for engineering applications.