8 research outputs found
Optimization of Shipping Cost of Cement for Selected Construction Projects of Julius Berger
No full textThe Transportation modelling technique was adopted in solving the transportation problem of shipping cement from three supply locations (cement depots) to three demand locations (construction sites) for Julius Berger construction company in Port Harcourt. The research was carried out for standard 900 bag truck load of cement from the selected cement depots. Transportation costs of the cement were analysed and the initial feasible solutions obtained, using the North-West Corner, Least Cost, and Vogel’s approximation methods. The Least Cost method resulted in the most feasible cost. Finally, the optimum shipping cost was attained, using the Stepping stone method, which resulted to an amount of $2,259 or (₦1,716,840 as at April 2023). Alternatively, Microsoft Excel solver was used on a computer in order to draw a comparison of the results. This gave exactly the same results
Optimization of Shipping Cost of Granite Chippings for Selected Construction Projects of Julius Berger
No full textTransportation modelling was employed to solve the transportation problem of shipping or transporting granite chippings from three supply locations (quarries) to three demand locations (construction sites) for Julius Berger construction company in Port Harcourt. The research was carried for standard 30tons tandem axle loads of granite from the various quarries. Transportation costs of the materials were analysed and the initial feasible solutions determined, using the North-West Corner, Least Cost, and Vogel’s approximation methods. The Least Cost method resulted in the most feasible cost. Finally, the optimum shipping cost was attained, using the Modified Distribution method, which resulted to an amount of $14,875 or (₦11,305,000 as at March 2023). Alternatively, Microsoft Excel solver was used on a computer in order to draw a comparison of the results. This gave exactly the same results
Development of a Time-Cost Model for Construction Projects in Rivers State University, Nigeria
No full textThis study aimed to develop a mathematical model to address the problems of construction costs and delays in buildings owned by tertiary institutions in Nigeria. A total of eleven building construction projects awarded and executed at Rivers State University between 2016 and 2023 were studied. Bromilow’s Time-Cost (BTC) model, a non-linear power regression mathematical model was developed. The study showed that 1916.3 working days are required to complete a building construction in the Rivers State University, Nigerian, for every Aus$1 million. The model predictions resulted in R2 value of 0.7465 which was subjected to two-tailed student t-tests for the for the construction times and costs. The statistical results indicate that the model is fit and adequate. The study also proved that the BTC model is applicable in Nigerian tertiary institutions, especially Rivers State University
Characterisation of Saw Dust Ash – Quarry Dust Bituminous Concrete
No full textThis study evaluates usefulness of Quarry Dust and Saw Dust Ashas mineral fillers in a bituminous concrete in order to reduce cost and encourage reuse of waste materials in the environment. Bituminous concrete blends were generated with 4% Quarry Dust and 4% Saw Dust Ash replacements of aggregates. The binder contents were 3, 3.5, 4, 4.5 and 5% for a 60/70 penetration grade bituminous binder. Briquette specimens were formed using the five different bituminous concrete blends. Standard laboratory experiments were conducted on the aggregates, Quarry Dust, Saw Dust Ash, bituminous binder and bituminous concrete specimens based on the relevant codes and standards. The Marshall method was used for the bituminous concrete design procedure. The optimum binder content was found to be 4.88% using the standard Marshall curves. At optimum binder content, using 4% design air void for medium traffic and maximum aggregate of 10mm, the Stability, Flow, VMA and VFA were 8.15kN, 8.28(0.25mm), 15.22% and 74.2% respectively. These were found to have passed the Asphalt Institute design criteria
A Predictive Mathematical Model for Water Absorption of Sawdust Ash - Sand Concrete
No full textSaw Dust Ash (SDA) is an industrial waste that has been used by many researchers in concrete to achieve economic and environmental sustainability. In this study, 5% of sand was replaced with SDA to produce concrete with different mix ratios. Scheffe’s simplex theory was used for five mix ratios in a {5,2} experimental design which resulted in additional ten mix ratios. Additional fifteen mix ratios were generated from the initial fifteen, for verification and testing. Concrete cubes of 150mmX150mmX150mm were formed using the thirty concrete mix ratios generated, and soaked in water for 24hours. The water absorptions of cubes from each mix ratio were determined with the standard procedure. The results of the first fifteen water absorption values were used for the calibration of the model constant coefficients, while those from the second fifteen were used for the model verification using Scheffe’s simplex lattice design. A mathematical regression model was formulated from the results, with which the water absorptions were predicted. The model was then subjected to a two-tailed t-test with 5% significance, which ascertained the model to be adequate and fit with an R2 value of 0.8244. The study also revealed that SDA can replace 5% of sand and promote environmental sustainability without significantly changing the water absorption
Development of a Time-Cost Model for Construction Projects in Federal Polytechnic of Oil and Gas, Nigeria
No full textTertiary institutions in Nigeria are usually faced with the problem of completing building projects within the scheduled durations and budgeted costs. In this study, 8 building construction projects completed in the Federal Polytechnic of Oil and Gas were analysed between the years 2014 and 2023. A non-linear regression time-cost model was developed based on the Bromilow’s Time-Cost (BTC) model. The results show that it would take 1858.3 working days to complete the construction of a building in a Nigerian tertiary institution for every one million Australian Dollar. Predictions were made for construction durations and construction costs with the formulated model. The model was found to be adequate and fit, with an R2 value of 0.8218. This also indicates that the BTC model applies to tertiary institution building construction projects in Nigeria.  
A Scheffe’s Predictive Model for Modulus of Elasticity of Sawdust Ash - Sand Concrete
No full textThe industrial waste, Saw Dust Ash (SDA) has been explored by several concrete related researches to achieve environmental and economic sustainability. In this study, 5% of sand was replaced with SDA to produce concrete with five different mix ratios. Scheffe’s simplex theory was used for five mix ratios in a {5,2} experimental design which resulted in additional ten mix ratios. For purposes of verification and testing, additional fifteen mix ratios were generated from the initial fifteen. Concrete cubes of 150mmX150mmX150mm were formed using the thirty concrete mix ratios generated, and cured in water for 28days. The compressive strengths of cubes from each mix ratio were determined. The static moduli of elasticity were also determined with a mathematical relationship. The results of the first fifteen static moduli of elasticity values were used for the calibration of the model constant coefficients, while those from the second fifteen were used for the model verification and testing using Scheffe’s simplex lattice design. A mathematical regression model was formulated from the results, with which the static moduli of elasticity were predicted. The model was then subjected to a two-tailed t-test with 5% significance, which confirms the model adequate and fit with an R2 of 0.8536. The study also revealed that SDA can be used to replace 5% of sand and promote environmental sustainability without significantly decreasing the static modulus of elasticity
Suitability of Saw Dust Ash and Quarry Dust as Mineral fillers in Asphalt Concrete
No full textThis study attempts to justify how suitable a conventional mineral filler and a non-conventional mineral filler can replace fractions of the aggregates in an asphalt concrete in order to reduce cost and encourage reuse of waste materials. Asphalt concrete mix proportions were generated with 3% Quarry Dust and 3% Saw Dust Ash replacements of aggregates. The binder contents were 3, 4, 5, 6 and 7% for a 60/70 penetration grade asphalt binder. Briquette specimens were formed using the asphalt concrete mix proportions carried out. Standard laboratory experiments were carried out on the aggregates, Quarry Dust, Saw Dust Ash, bituminous binder and asphalt concrete specimens based on the relevant codes and standards. The Marshall method was used for the asphalt concrete design procedure. The optimum binder content was found to be 4.85% using the standard Marshall curves. At optimum binder content, using 4% design air void for medium traffic and maximum aggregate of 10mm, the Stability, Flow, VMA and VFA were 5.83kN, 15.73(0.25mm), 15.28% and 73.25% respectively. These were within the Asphalt Institute design criteria
