Cement is subject to degradation by aggressive media found in the environment. Durability tests are therefore necessary for any cementitious material in a given aggressive environment. This study investigated chloride and sulphate diffusivity in mortar made from selected Kenyan cements. In this study, test cements were selected Kenya OPC and PPC. The test cements were labeled with respect to company source and cement category; the letters A, B and C represented companies while O and P represented OPC and PPC respectively. AO for example, represents OPC from company A and AP represents PPC...

Iron is the single element used in industries in larger quantities than all the other metallic elements combined. This is because of the very wide applications of the metal in manufacture of machinery, vehicles and in building industry. Whereas the element occurs in more than 80 minerals, only a small number is important as a source of iron. However, even these must be concentrated to make them suitable for putting in a blast furnace. Since methods used for concentration are expensive, the study was meant to investigate on a cheaper technique of obtaining iron from heated laterites/charcoal...