Abstract Groundwater contamination by chlorinated hydrocarbons (CHC) is a common phenomenon that poses health risks to both humans and animals. These halogenated hydrocarbons infiltrate into the soil matrices and form pools at the bottoms of the aquifers thus contaminating the groundwater sources. Thermally enhanced soil vapour extraction (TSVE) using steam–air injection has gained popularity as an alternative technique to remediate the saturated and vadose source zones contaminated with C...
The strength performance of UHPFRC with micro and hooked-ends steel fibers was studied in this paper using Finite Element (FE) modelling and simulation. The specimens were modelled in geometry, material, constraints, load and boundary conditions using ABAQUS package and dynamic explicit analysis was used to to investigate the crack pattern, failure mode and stress-stain behaviour of the UHPFRC specimens when subjected to uniaxial compression and tension loading. Results from the FE simulation...
Abstract The capability of fuzzy sets to express gradual transition from membership to non-membership and vice versa has broad utility. The overlap between two or more adjoining fuzzy sets create very important fuzzy “patch” that deserves special attention. In the existing literature, Zadeh, Mamdani and TagakiSugeno have established that the Min- and Max- operators can effectively be used for fuzzy interpolative inference. But what has not been done is to define an explicit expression for...
ABSTRACT This paper presents the evaluation of the impact of climate change on water resources and yield capacity of Asa and Kampe reservoirs. Trend analysis of mean temperature, runoff, rainfall and evapotranspiration was carried out using Mann Kendall and Sen’s slope, while runoff was modeled as a function of temperature, rainfall and evapotranspiration using Artificial Neural Networks (ANN). Rainfall and runoff exhibited positive trends at the two dam sites and their upstream while fore...
ABSTRACT Experiments have been conducted to develop temper-annealing schedule for continously cast and cold-worked aluminium 1200. By using the method of graphical combination of the results of tensile and deep drawn tests, it is shown that a cost effective temper-annealing schedule that would impart improved mechanical properties.
Abstract This paper examined the heat-transfer coefficients and the Nusselt number for turbulent flow for a methane-air flame occurring in cross-flow streams in an open duct. The governing equation of momentum, energy, mass fraction and radical nuclei concentration were solved in a fully coupled fashion at each control volume. The model encompasses conservation equations of gas components participating in the process and energy equation. A FORTRAN code was written with a Tridiagonal matrix s...
Correlation and regression in this paper were employed as analytical tools to study the degree of relationship as well as the nature and strength of the relationship between green concrete properties and percentage replacement of cement with civil engineering materials. Pearson product-moment method and Spearman’s correlation coefficient were extensively used to show how correlation analysis can be practically applied in green concrete research. Least square regression line method for b...
There is an inherent correlation between law and pace of infrastructural development. A solid, clear and foreseeable legal construction policy regime forms the basis for infrastructural development. In any form of legal regime, the role of the government and its bureaucracy remains crucial at every stage including licensing, construction and operation of infrastructural development projects. The Corona Virus (Covid-19) pandemic has introduced new construction requirements. This research work ...
The development of the country is directly related with the better road communication from mega cities to rural villages. Pakistan is a developing country and has started a grand network of highways, superhighways and motorways in all four provinces along with Kashmir and Northern and northwestern regions bordering china and Afghanistan. Highway Flexible pavements are the most commonly used form of pavements and have four component layers namely Sub-grade, Sub-base and base and surface course...
Abstract The purpose of this paper is to study the important engineering properties of the volcanic rocks present with the Nagar Parkar Granites located from Sindh University Campus Jamshoro 5 h 44 min (355.3 km) via Hyderabad-Badin Road and 5 h 57 min (323.5 km) via Naukot-Mithi Road and Islamkot, the rocks look suitable for pavement and concrete aggregates. Numbers of standard tests were conducted. Which included; Specific Gravity, Gradation, Soundness, Particle shape and Surface Texture Ab...
Study of Coarse Aggregate Characteristics on Strength Properties of High Performance Concrete Using Chemical Admixtures Mushtaque Ahmed Pathan1, Rafique Ahmed2, Maryam Maira3 1Assistant Professor, 2Associate Professor, Center for Pure & Applied Geology, UoS Jamshoro, Sindh, Pakistan 3Freelancer Researcher Mehran university of Engg. & Technology Jamshoro, Sindh, Pakistan *Corresponding author: Mushtaque Ahmed Pathan | Received: 14.03.2019 | Accepted: 21.03.2019 | Published: 31.03.2019 DOI:10.2...
ABSTRACT Samples of laterites classified by American Association of State Highway and Transportation Officials (AASHTO) as A-7-6 and A-7-5, collected from two different borrow pits in Ado-Ekiti were tested for the assessment of their geotechnical properties in natural and stabilized states. The research is aimed at assessing effects of sawdust ash (SDA), lime and the combination of sawdust ash and lime (SDAL) on the properties of the soil samples. The samples were subj...
Abstract- Two different samples of soil tested as A-7-5 and A-7-6 were stabilized respectively with lime and cement. The samples were stabilized with the additives in steps of 2% and subjected to laboratory tests such as consistency limits, compaction, California bearing ratio (CBR) and unconfined compressive strength (UCS) until it reached 10% additives by weight of dry soil sample. The Proctor energy type of compaction and soaked method of CBR was adopted for the research while the compress...
One of the most crucial factors affecting the service life of reinforced concrete (RC) structures attacked by aggressive ions is reinforcement corrosion. As the steel corrosion progresses, crack propagation in concrete medium endangers the serviceability and the strength of RC structural members. In this study, a nonlinear mathematical model for determining the displacement and stress fields in RC structures subjected to reinforcement corrosion is introduced. For corrosion products, a nonline...
A source of large surface areas for solar photovoltaic (PV) farms that has been largely overlooked in the 13,000 United States of America (U.S.) airports. This paper hopes to enable PV deployments in most airports by providing an approach to overcome the three primary challenges identified by the Federal Aviation Administration (FAA): (1) reflectivity and glare; (2) radar interference; and (3) physical penetration of airspace. First, these challenges and precautions that must be adhered to fo...