Use of Fly Ash as a Partial Supplement of Sand in Road Sub-grade
Md. Akhtar Hossain,
Rayhan Mahamud,
Md. Rasel Rana
Issue:
Volume 1, Issue 1, September 2016
Pages:
1-6
Received:
3 November 2016
Accepted:
18 November 2016
Published:
20 December 2016
DOI:
10.11648/j.ajset.20160101.11
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Views:
Abstract: Fly ash is a byproduct causes environmental pollution. Every year remarcable amount of ferming land is used for it’s disposal. But it has some geotechnical properties which we can use for civil engineering pueposes. The present study aims at development of specifications for use fly ash in road construction and their suitability in improved sub-grade of a road pavement. Laboratory proctor Test for MDD and CBR Test for CBR values were performed at first for fly ash and sand sample alone and then for fly ash with sand in different proportions. Then the result is compared with LGED, Bangladesh requirements to find out the suitable samples for road sub-grade. According to ROAD DESIGN STANDARDS, RURAL ROAD (2005) published by LGED and JICA- required CBR for improved sub-grade material for low and medium traffic road construction is 8%. In this study it is found that, upto 40% fly ash mixed with sand gives more than 8% CBR. So, at most 40% fly ash may be used as a supplement of sand for improved subgrade.
Abstract: Fly ash is a byproduct causes environmental pollution. Every year remarcable amount of ferming land is used for it’s disposal. But it has some geotechnical properties which we can use for civil engineering pueposes. The present study aims at development of specifications for use fly ash in road construction and their suitability in improved sub-gra...
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Design and Construction of a 2.5 Kva Photovoltaic Inverter
Ekwuribe J. Michael,
Uchegbu E. Chinenye
Issue:
Volume 1, Issue 1, September 2016
Pages:
7-12
Received:
4 October 2016
Accepted:
2 November 2016
Published:
21 December 2016
DOI:
10.11648/j.ajset.20160101.12
Downloads:
Views:
Abstract: The epileptic nature of power generation via hydro and thermal sources in Nigeria has given rise to source alternate forms of power generation. The power supply situation is so erratic that some communities are cut off for days, weeks, or months in a bid to ration the low supply from the nation’s grid. This gap, period of no supply or cut off from the grid, is what this paper will solve by way of designing and constructing an alternate source using solar power for household use. The design and construction of the unit, a solar powered 2.5KVA inverter was achieved by using a 21/400 turns wound transformer, an SG3524N PMW fixed frequency voltage regulator controller, MOSFET transistors,five80W/18Asolar panel, three200AH deep cycle battery, and a charge controller to monitor the output of the battery for safety. The battery is connected to the inverter circuit to generate 220V alternating current in its output via a step-up transformer. The inverter uses the SG 3524N IC chip fixed frequency Pulse–Width-Modulator (PMW) Voltage regulator controller. The designed oscillation period is set at 50% duty cycle or 0.02 seconds to match the frequency of loads connected to it. From table of results; the inverter was able to maintain stability for 4 hours when a refrigerator and other loads up to a 2000W were connected to it. But at peak sunshine and the solar panel tilted 0o relative to the roof inclination, the inverter output for the same load lasted longer hours.
Abstract: The epileptic nature of power generation via hydro and thermal sources in Nigeria has given rise to source alternate forms of power generation. The power supply situation is so erratic that some communities are cut off for days, weeks, or months in a bid to ration the low supply from the nation’s grid. This gap, period of no supply or cut off from ...
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