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Investigations on Self-Curing Concrete using Polyethylene Glycol
No full textCuring is the name given to the procedure used for promoting the hydration of the cement and consist a control of temperature and moisture movement from the concrete. Curing allows continuous hydration of cement and consequently continuous gain in the strength, once curing stops strength gain of the concrete also stops. Proper moisture conditions are critical because the hydration of the cement virtually ceases when the relative humidity within the capillaries drops below 80%. Proper curing of concrete structures is important to meet performance and durability requirements. In conventional curing this is achieved by external curing applied after mixing, placing and finishing. Self-curing or internal curing is a technique that can be used to provide additional moisture in concrete for more effective hydration of cement and reduced self-desiccation. When concrete is exposed to the environment evaporation of water takes place and loss of moisture will reduce the initial water cement ratio which will result in the incomplete hydration of the cement and hence lowering the quality of the concrete. An experimental study carried out an investigate the use of water-soluble polyethylene glycol as self-curing agent. In this study compressive, tensile and flexural strength of self-curing concrete for 7 and 28 days is found out and compared with conventional concrete of similar mix design
Precast Concrete Construction - A Step Towards Sustainable Developments
No full textIn order to fulfil the demand of urban population with sustainable development objective, precast concrete construction system in housing project is the ideal solution. This paper highlights the feature of precast system: the 3-P precast building system. The sustainability aspects of building construction need to be factored in for industrial housing construction. This building system was evolved and perfected to reduce the waste, save energy, save water, and create a pollution free environment with smart construction methodology
Determination of Surface Structural Parameters by Iterative LEED Algorithm
No full textConventional method of determination of structure from Low Energy Electron Diffraction (LEED) intensity pattern is to compute the diffraction patterns including multiple scattering for plausible guess structure and finding the actual structure from the best match. Large scattering cross section of low energy electrons and complexity of multiple scattering restrict (LEED) data interpretation for direct inversion of diffraction patterns. We here investigate the possibilities of direct computation of surface structure by reversing the process of layer doubling method of conventional LEED theory. Iterative computation based on linear approximation consistent with realistic constraints can be utilized to retrieve the surface parameters. Full knowledge of underlying bulk structure and chemical composition of surfaces are supplemented to retrieve the surface from experimental LEED patterns.
Boundary-Layer Flow of a Nano-Fluid over a Moving Surface with Fluid Injection or Suction
No full textThe boundary-layer flow of a nano-fluid over a moving surface is simulated, by solving the governing equations, using an efficient implicit finite difference scheme called the Keller’s box scheme. This scheme is second order accurate even on a non-uniformly spaced grid. Surface injection or suction is considered through appropriate boundary conditions. The effect of nano-particles is taken into account by incorporating the thermo-physical property models. The effect of wall injection or suction, as well as the moving surface velocity, affects the wall shear stress and heat transfer rates in a complex manner inducing flow separation in certain cases. These results are very useful in assessing the effectiveness of the use of different nano-fluids for practical engineering applications
Finite Element Design and Analysis of Fuselage Frame for Two Tonne Helicopter
No full textThe structural design of a helicopter is entirely differ from the other flight vehicle. The structural components of a helicopter takes both lift load and thrust loads at all points in it. So, the structural efficiency should be the main aspect of the helicopter structures for withstanding these loads during different conditions of flight. In the present scenario researches have been carried out in a large scale to improve the structural efficiency of the aerospace structures especially major focus is in the case of helicopters. The main aim of this paper is to design a fuselage frame made of conventional material for a two tonne helicopter and analyzed for structural efficiency. The forward fuselage frame under the main rotor hub assembly of a two tonne helicopter has been considered for analysis as it was the main load carrying member of the helicopter and most of the aerodynamic loads will act on the frame under the main rotor hub assembly. Designing of fuselage frame is carried out using modeling software. Structural analysis of the frame has been done using FEM packages. In order to obtain a quality meshing and for better refinement Hypermesh is used. Stress distribution and deformations are analyzed for different configuration and the results are compared. Based on the result analysis the efficient structural design is obtained to meet the design requirements of the helicopter frame
Overview of Microcontrollers
No full textA microcontroller is a little laptop on one microcircuit containing a processor core, memory, and programmable input/output peripherals. Program memory within the kind of Ferroelectric RAM, NOR flash or OTP ROMis additionally usually enclosed on chip, similarly as a generally touch of RAM. Microcontrollers square measure designed for embedded applications, in distinction to the microprocessors employed in personal computers or alternative general purpose applications
Application of a Nobel Approach for Edge Detection of Images
Full text linkIn this paper, a unique edge detection technique which computes edges of different images using the concept of Center of Mass with Canny Edge Detector is presented. The proposed method can be used as framework for running multi-scale edge detectors for different images in image processing. Here the edge detection by COM with Canny edge detector is compared with COM technique