The Effect of Waste Tyre Steel Fibers distribution Characteristics on the Flexural Strength of Concrete with Improving Environmental Impact in Pakistan
Rizwan Hussain Wagan,
Farhan Hussain Wagan,
Imran Hussain Wagan,
Ghulam Hussain Wagan
Issue:
Volume 3, Issue 5, September 2017
Pages:
49-55
Received:
20 March 2017
Accepted:
14 April 2017
Published:
28 November 2017
Abstract: The use of vehicles in Pakistan is increasing day-by-day because of which disposal of solid waste to the landfills of used tyres is a serious issue to be solved for Pakistan EPA. Currently this industry is facing many challenges due to lack of support from government for the recycling and reuse of waste tyre by products but manually a large quantity of high strength steel fibers are being extracted from waste tyres, the dominant use of this tyre-derived fiber is a scrap steel to manufacture new iron or steel. This research study is focusing on the use of steel fibers extracted from waste tyres in concrete with different proportions to produce a concrete more strong than ordinary concrete (specially as a member like Beam) economical and cost effective. Different concrete specimens were fabricated and tested in uniaxial compression testing machine to find compression and splitting Beams for the Flexural Strength. The steel fibers were substituted into the concrete by dry weight of mix with 0%, 0.5%, 1%, 1.5%, 2% and 2.5%. Result shows that the flexural strength of concrete with 2.5% fibers improved up to 74%.
Abstract: The use of vehicles in Pakistan is increasing day-by-day because of which disposal of solid waste to the landfills of used tyres is a serious issue to be solved for Pakistan EPA. Currently this industry is facing many challenges due to lack of support from government for the recycling and reuse of waste tyre by products but manually a large quantit...
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Developing a Facility Location Model for Reducing Costs Before and After Enemy Attack
Hasan Hosseini-Nasab,
Saeed Abedi
Issue:
Volume 3, Issue 5, September 2017
Pages:
56-62
Received:
19 April 2017
Accepted:
25 May 2017
Published:
28 November 2017
Abstract: Site selection is one of the main principles of the passive defense. A multiple objective and nonlinear programming formulation which considers the principles of passive defense site selection according to both qualitative and quantitative aspects is proposed in this paper. The aim is to reduce the site selection costs while the security of network formed by the facilities is maximized, and to reduce the costs of the network after being attacked. To solve the proposed model, a GA-TOPSIS method is proposed.
Abstract: Site selection is one of the main principles of the passive defense. A multiple objective and nonlinear programming formulation which considers the principles of passive defense site selection according to both qualitative and quantitative aspects is proposed in this paper. The aim is to reduce the site selection costs while the security of network...
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Saw Dust Ash Substitution for Cement Pastes-Part I
H. H. M. Darweesh,
M. R. Abo El-Suoud
Issue:
Volume 3, Issue 5, September 2017
Pages:
63-71
Received:
18 October 2016
Accepted:
21 December 2016
Published:
28 November 2017
Abstract: The saw dust (SD) is often used as a fuel which in turn leads to the environmental pollution. So, it must utilize this waste into useful applications to avoid what is known as “air pollution”. In this study, the SD was converted to saw dust ash (SDA) by its firing at 500°C. It is then used as a partial substitution for cement. The results showed that the water of consistency (WC), initial setting time (IST) and final setting time (FST) of the Portland cement pastes are decreased with the substitution of SDA due to the presence of Na-lignosulfonate. The bound water content (BW), bulk density (BD) and compressive strength (CS) increased with time of hydration up to 90 days, while the apparent porosity (AP) decreased. The BW, BD and CS of the cement pastes containing 5-15 wt. % SDA are slightly higher than those of the blank (S0) at all hydration ages. The free lime content (FL) of the Portland cement pastes (S0) increased as the hydration progressed onward, whereas the cement pastes with SDA (S1-S5) only increased up to 3 days and then decreased. The FTIR spectra of the OPC without SDA showed that the free lime content increased as the hydration proceeded till 90 days, while that of the optimum cement mix containing 15 wt. % SDA, the FL content increased only up to 3 days and then progressively decreased until nearly disappeared after 90 days.
Abstract: The saw dust (SD) is often used as a fuel which in turn leads to the environmental pollution. So, it must utilize this waste into useful applications to avoid what is known as “air pollution”. In this study, the SD was converted to saw dust ash (SDA) by its firing at 500°C. It is then used as a partial substitution for cement. The results showed th...
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