Ultra-high performance concrete (UHPC) been an advanced concrete introduced as reactive powder concrete (RPC) over twenty years ago, is now being employed for use in the construction industry of some developed countries like China, Germany and United States of America. Its excellent properties in structural performance and durability make it the civil engineering material that will reshape the future of the construction industry in terms of structural performance; and this paper aims at helpi...
ABSTRACT Identification of exhaust fan bearing defects has its root foundations in the analysis of frequency modulation and sensing using mostly online techniques. Centrifugal fans are the most commonly used fans in the industry today. They are preferred to axles because they are cheaper and constructed with simplicity. They are used in wind systems in vehicles and buildings and also in delivering gas or minerals. They are suitable for industrial and air pollution processes and systems. Fa...
Abstract Fire safety is an important consideration in many structures and spaces because of the danger and damage that it may pose. Given so, a fire risk assessment is not often conducted on construction sites or while the building is under construction. They only assess this after the construction or before they provide an occupancy permit. Thus, this study assessed the level of fire risk of construction sites in Nueva Ecija. The study included 61 respondents all over the province. The study...
ABSTRACT The use of solar energy for cooking offers an alternative source of energy to the high cost of petroleum products and the diminishing wood fuel products for cooking and heating applications. An effective solar cooker is the one that can be used throughout the day and in the evening when there is no sunshine. Most areas in Kenya can be considered as a high potential solar energy area because Kenya is located on the equator. Most of the solar cooker designs do not have thermal storage...
ABSTRACT This work investigates the structural characteristics of soilcrete blocks (lateritecement blocks and laterite-sand-cement blocks) produced with locally available and affordable laterite. Scheffe’s simplex method and Osadebe’s regression theory were used to formulate mathematical models for optimisation of properties of soilcrete blocks which include compressive strength, split tensile strength, shear strength, flexural strength, Poisson’s ratio, modulus of elasticity, shear mo...
ABSTRACT The study was aimed at developing mathematical models on the hydraulic performance of Sandbags as Checkdam for erosion control. Pilot studies were carried out at two sites. Site ‘A’ was a natural gully at a location in Ezinihitte-Mbaise, Imo State while site ‘B’ was an artificial channel excavated on the slope of Otamiri River at Federal University of Technology, Owerri. Artificial runoff was simulated into site ‘B’ by pumping water from Otamiri River. Sandbags of variou...
ABSTRACT This work investigated the structural characteristics of lime cement concrete using 30 selected mix ratios. The properties studied include, compressive strength, flexural strength, splitting tensile strength, shear strength, poisson ratio, modulus of elasticity, and modulus of rigidity. A total of 360 concrete cube specimen, 360 concrete prototype beam specimen, and 360 concrete cylinder specimen were cast and cured in open water tanks. 3 specimen were cast for each mix proportion. ...
ABSTRACT Isolated or Stand-alone power systems with the use of renewable energy sources have become cost-effective and a convenient option for areas where grid connection is neither available nor feasible. A hybrid combination of Renewable Energy Technologies (RETs) is considered to be the best suited alternative to an expensive grid extension for remote areas around the world. This research focuses on creating a model for electricity generation from a mix of renewable resources (hydro, sola...
ABSTRACT In the design of flood control structures, there is need for rainfall intensity estimation for design discharge computation. To make the rainfall intensity values easily available in south-east and south-south Nigeria, this research developed rainfall models. Dimensional and Regression analyses were used to produce models of rainfall intensities. The dimensional models are dimensionally balanced as opposed to the other models which are based on Talbot, Benard and Quotient equations....
ABSTRACT Suitable rainfall models of Enugu City is presented based on the statistical method of least squares. A total of 23 rainfall models are developed in all and grouped into 2 sets. The first set contains 4 rainfall models which represents an inverse relationship between rainfall intensities and durations for specified return periods of 1.1, 2.2, 5.5 and 11 years. High and positive values of coefficients of correlations of 0.9735 to 0.9885 were obtained; an indication of good curve fitt...
ABSTRACT An evaporative cooling system was developed with locally available materials. The system was aimed at providing lower temperature and higher relative humidity necessary for extending the shelf life of fruits and vegetables. The performance of the cooler was evaluated in terms of temperature drop, humidity gain, cooling efficiency and quality assessment of the stored products. Two categories of test were carried out on the cooler with the chosen absorbent materials: the no-load test ...
ABSTRACT The study compared and predicted the remediation rates of microbes using the rate removal of Total Petroleum Hydrocarbon Content (TPHC) of a crude oil polluted land. This was done using field experimental data generated from the soil of the Federal University of Technology Owerri Research Farm in Imo State, Nigeria. The soil was artificially polluted in the laboratory with crude oil - Bonny light - with specific gravity of 0.8323. Petroleum contaminant present in the soil was 230mg ...
ABSTRACT This research work presents buckling and vibration analyses of line continuum using 6 x 6 stiffness matrices. The study used six term Taylor McLaurin’s polynomial series shape function and the stiffness matrices were developed using energy variational principle. Two deformable nodes were considered at the centre of the continuum which brings the number of deformable nodes to six. The six term Taylor McLaurin’s shape function was substituted into strain energy equation and the re...
ABSTRACT This work studied the buckling analysis of plates subject to biaxial forces using the Galerkin’s method. Twelve boundary conditions were considered. The plate deflection equations were obtained using the polynomial series, and from the plate deflection equations, the expression for the critical buckling loads of the different plate boundary conditions were obtained for different aspect ratios, ∝ using the Galerkin’s functional. The aspect ratios, considered throughout this wor...
ABSTRACT This research work presents the buckling analysis of isotropic rectangular plates using Ritz method. The Ritz method and polynomial series were used in the analysis. The various boundary conditions covered in this research work includes SSFS, CCFC, CSFS, CCFS, SCFC and SCFS. The polynomial series was truncated at the fifth term, which satisfied all the boundary conditions of the plate and resulted to a peculiar shape function. The resulting shape function were substituted into the t...