Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=20544#.VNsVHCzQrzE Author(s)   J.A. Omotoyinbo , O.O. Oluwole Affiliation(s) Metallurgical and Materials Engineering Dept.,FUT, Akure, Nigeria . Materials Science and Engineering Dept., OAU,Ile-ife, Nigeria . ABSTRACT Working properties of some clay deposits in Ekiti State, Nigeria were investigated with a view to determine their suitability for use as refractory bricks. The samples were collected from three different commercial pottery clay centers in Ekiti State; they are Ara, Awo and Isan. Two varieties were collected from both Ara and Isan, which are named Ara 1, Ara 2, and Isan 1, Isan 2 respectively while only one type was collected from Awo. The clay samples were crushed, pulverized, sieved and their chemical compositions were determined. The clay samples were treated separately as well as blended together in different proportions and moulded i...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=20498#.VNHb9SzQrzE Author(s)    L.E. aUmoru , J.A. Ali , A.A. Afonja Affiliation(s) Department of Metallurgical and Materials Engineering,Obafemi Awolowo University, Ile-Ife, Nigeria. . Nigeria Building and Road Research Institute (NIBRRI)Garki, Abuja . Department of Metallurgical and Materials Engineering,Obafemi Awolowo University, Ile-Ife, Nigeria. . ABSTRACT This work has investigated the effect of austempering variables on hardness, strength and toughness of 0.48wt. % calcium treated cast iron. The iron was subjected to varying austenitizing and isothermal transformation temperatures and times. Samples were austenitized for 15, 30, 45 and 60 minutes at each of the temperatures 850, 875, 900, 925 and 950 degrees centigrade. Also for 950℃ and 60 minutes of austenitizing conditions, samples of the 0.48wt. % calcium treated irons were isothermally ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51356#.VGVf32fHRK0 Author(s) Shodolapo Oluyemi Franklin 1 , Mmasetlhomo Tommy Gumede 2 Affiliation(s) 1 Department of Civil Engineering, Faculty of Engineering and Technology, University of Botswana, Gaborone, Botswana . 2 Norvels (Pty) Ltd T/A Engineers International, G. West Industrial, Gaborone, Botswana . ABSTRACT The present study addresses the global concern of sustainability in building and construction engineering and how to an extent the use of demolished aggregate wastes in concrete production contributes towards ameliorating or minimizing the problem. The influence of demolished aggregate waste on the mechanical strengt...