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International Journal of Material and Mechanical Engineering
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  This is an Open Access Journal Open Access journal
     ISSN (Print) 2162-0695 - ISSN (Online) 2164-280X
     Published by Science and Engineering Publishing Company Homepage  [48 journals]
  • Development of Pulverized Palm Kernel Shells Based Particleboard

    • Abstract: Development of Pulverized Palm Kernel Shells Based Particleboard
      Pages 54-61
      Author R.S. Fono-TamoO.O. IdowuF.O. Koy
      The study evaluated the performance characteristic of pulverised Palm Kernel Shell (PKS)-based particleboard. The pulverised palm kernel shell was compounded with other ingredients (such as adhesive, saw dust) in the composite development phase. Standard wood-based particleboard and pulverized PKS-wood based particleboard were produced following standard procedure. The particleboards were evaluated and compared with regards to their physical, mechanical and thermal properties. Furthermore, the properties and performance characteristics of the particleboards were compared with the recommended standard. The properties of the PKS-wood based and wood-based particleboards were: 2.557 and 5.654 MPa. And modulus of rupture was 4.093 and 2.454 MPa, modulus of elasticity; 0.50459 and 0.7524 MPa, stress at proportional limit; 5.74691 and 7.14242 J, work at maximum load; 0.72 and 0.54 g/cm3, air-dried density; 10.50 and 11.89 %, moisture content; 1.705 and 3.770 MPa, internal bond strength; 0.50 and 0.13 W/mK, thermal conductivity; and 10.25 and 11.75 %, thickness swelling. This work thus established that PKS may be combined with saw dust as base material in the manufacture of standard particleboards.
      PubDate: 2014-08
       
  • Experimental and Analytical Investigations on Flexural Behaviour of
           

    • Abstract: Experimental and Analytical Investigations on Flexural Behaviour of Retrofitted Reinforced Concrete Beams with Geopolymer Concrete Composites
      Pages 62-68
      Author C.K. MadheswaranPinky merlin Phili
      Existing multi-storey buildings in earthquake prone regions of India are vulnerable to severe damage under earthquakes. So there is an urgent need for retrofitting of deficient and damaged buildings. Portland cement (PC) production is under critical review due to high amount of carbon dioxide gas released to the atmosphere and Portland cement is also one among the most energy-intensive construction material. The current contribution of greenhouse gas emission from Portland cement production is about 1.5 billion tons annually or about 7% of the total greenhouse gas emissions to the earth’s atmosphere. So retrofitting of existing deficient building using eco-friendly material which could promise higher structural performance than the original building is essential.Geopolymer concrete (GPC) is a non-Portland cement binder based on alkaline activation of industrial wastes such as fly ash and GGBS. The application Geopolymer concrete in retrofitting can reduce the production of cement and can create an ecofriendly construction atmosphere to an extent. So the feasibility of geopolymer concrete in retrofitting of damaged structures is required to be studied. This paper presents the details of the mix designs of GPC mixes, preparation of retrofitted test specimen, testing and evaluation with respect to cracking, ultimate load, deflection and failure modes. Non-linear finite element analysis of beams by 3D modeling of concrete (solid 65 element) and discrete modeling of reinforcement (Link 8 element) was carried out using ANSYS software. The load deflection characteristics, failure modes and crack patterns are obtained from the experimental and analytical studies. The results of the study indicate that the performance of retrofitted beam with GPC and control beam shows good agreement in ultimate load, failure modes and crack patterns.
      PubDate: 2014-08
       
 
 
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