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Library's collection Library's IT development Cancel| An Appraisal of project procurement methods in the Nigerian construction industry | The aim of every client at the beginning of any project is to have at the end of the day a quality structure delivered on time and within budget. However, researches have shown that in most cases this aim is not met. The aim of the study that formed the basis for this ...
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| Selecting materials for environmental-friendly buildings: the need for improved environmental impact data | Buildings of the future need to be more environmental-friendly. Selecting environmentally-benign materials in design stage would partly help achieving such goal. Examination of existing environmental impact data of building materials reveals that the data differ greatly from one source to another. Comparisons of environmental impact values of selected materials are presented. ...
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| Rainwater management model development for agriculture in the Savu island semi-arid region | Savu Island is a semiarid region with few rainfalls. The meager annual rainfall of about 1,000-1,500 mm that lasts for three to five months tends to cause draught. To cope with this situation, the Author tries to develop a rainwater management model located in Daieko village. This model constitutes an infrastructure that consists of ...
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| Assessing risk management capability of public sector organizations related to PPP scheme development for water supply in Indonesia | The success of Public Private Partnership (PPP) for water supply investment is inseparable from the capability of risk management of the parties within the project. This study investigates the risk management capability of Indonesian local public sector organizations that are potentially involved in PPP schemes for water supply. A risk management ...
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| Ductility of a 60-story shearwall frame-belt truss (virtual outrigger) building | Researches have been conducted to study Shearwall-frame combined with belt truss as structural system (SFBT), in which the post-elastic behavior and ductility of this structural system are explored. A 60-story SFBT building, with a ductility set equal to 3.75 (value for fully ductile cantilever wall) is considered. The Elastic Response Spectrum used for design ...
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| Use of recycled concrete aggregate in controlled low-strength material (CLSM) | Use of recycled concrete aggregate (RCA) is getting importance as it minimizes the use of fresh materials and eliminates waste disposal. One of the uses of RCA is as aggregate in Controlled Low Strength Material (CLSM). This paper reports the results of the investigation done on the use of RCA in ...
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| Estimating the distribution of air voids in concrete | Chord length measurements are used to estimate the volumetric distribution of air voids within hardened concrete samples. The accuracy of the Linear-Traverse method is questionable because chord lengths do not directly represent the actual volumes of the air voids. Using computer simulation, randomly generated concrete samples were analyzed using the Linear-Traverse method to compute the ...
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| Wind affected density current profile in a small semi-enclosed water body | Density current is a type of current that occurs when fluid flow enters a fluid body of different density. The density difference introduces stratification state that requires treatment in the parameterization of turbulence. Due to the geometric shape of location of this study, which is considerably small semi-enclosed water body, a ...
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| Flood mitigation of Nyando river using duflow modelling | Duflow surface water hydrodynamic model has been applied using a case study from Nyando catchment in the western part of Kenya in Africa to simulate various extreme flood behaviours and their retardation levels by using selected structural measures as flood mitigation techniques. The objective of this case study was to establish ...
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| The Effects of different curing methods on the compressive strength of terracrete | This research evaluated the effects of different curing methods on the compressive strength of terracrete. Several tests that included sieve analysis were carried out on constituents of terracrete (granite and laterite) to determine their particle size distribution and performance criteria tests to determine compressive strength of terracrete cubes for 7 to ...
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| Influence of plastic waste fibers on the strength of lime-rice husk ash stabilized clay soil | A study has been undertaken to investigate the strength of stabilized clay-soil reinforced with randomly distributed discrete plastic waste fibers by carrying out unconfined compressive strength and tensile-split strength test. In this study, the clay soil was stabilized with lime and rice husk ash mixtures. The effect of the fiber length ...
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| Predicting nonlinear behavior and stress-strain relationship of rectangular confined reinforced concrete columns with ANSYS | This paper presents a nonlinear finite element modeling and analysis of rectangular normal-strength reinforced concrete columns confined with transverse steel under axial compressive loading. In this study, the columns were modeled as discrete elements using ANSYS nonlinear finite element software. Concrete was modeled with 8-noded SOLID65 elements that can translate either ...
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| Kriging-based finite element method: element-by-element kriging interpolation | An enhancement of the finite element method with Kriging shape functions (K-FEM) was recently proposed. In this method, the field variables of a boundary value problem are approximated using `element-by-element? piecewise Kriging interpolation (el-KI). For each element, the interpolation function is constructed from a set of nodes within a prescribed domain ...
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| Seismic progressive collapse: qualitative point of view | Progressive collapse is a catastrophic structural phenomenon that can occur because of human-made and natural hazards. In progressive collapse mechanism, a single local failure may cause a significant deformation which then may lead to collapse of a structure. The current practices in progressive collapse analysis and design method generally focus on ...
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| An Investigation of the performance of due process mechanism in the execution of construction projects in Nigeria | Various procurement methods are in use in the award of public contract in Nigeria. The traditional method, which is widely used, has been criticized for its non-performance in projects execution and delivery. To avoid the adverse effects of the current contract procurement methods, Due Process mechanism was introduced. This study, therefore ...
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| Infrastructure leakage index (ILI) as water losses indicator | The key in developing a strategy for management of non-revenue water (NRW) is to gain a better understanding of the reasons for NRW and the factors which influence its components. The components of NRW can be determined by conducting a water balance analysis. The International Water Association (IWA) provides a water ...
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| Modeling of aquifer thermal energy storage (ATES) using heat and solute transport in 3d (HST3D) | Aquifer Thermal Energy Storage (ATES) is the process of storing heat in an aquifer by injecting water of a different temperature than the ambient groundwater, storing it, then recovering the heated or cooled water for use in a heat exchange energy system. This paper describes numerical modeling of ATES system in ...
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| Comparative study of equivalent manning roughness coefficient for channel with composite roughness | This paper reviews the applicability of nine selected expressions in determining the equivalent value of the Manning coefficient of roughness. For this purpose, a prismatic 4m-long and 0.05m-wide trapezoidal-shape channel was constructed, namely the homogeneous channel and the composite channel. The homogeneous channel had the same surface lining, whereas the composite ...
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| Benchmarking the performance of construction procurement methods against selection criteria in Nigeria | The study developed performance indices by the widely used procurement options in Nigeria on selection criteria. The traditional mean and standardized ratio were used to form the utility coefficients. Results revealed that performance by the procurement options depended on the respondents? categorization and cost categorization of projects. Public clients ranked the ...
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| Behavior of expansive clay of Ngawi region (East Java) under water content variation | When expansive clay is wetted, deformations occur both vertically and laterally. If it is tested in an oedometer ring apparatus the lateral deformation will be restrained by the wall of the ring. This paper present the results of an experimental investigation using modified oedometer test for measuring the vertical and lateral ...
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