ABSTRACT This work presents the effects of metakaolin as a supplementary cementitious material in mortars for construction applications. Kaolin from Teleku Bokazo was calcined at 650oC and partially used to replace Portland limestone cement to produce mortars and paste. The metakaolin was successfully used in a cement paste and its effect observed in the different cement replacements proportions. The replacements ranged from 10% - 35% by mass and characterised after 3, 7, 14 and 28 days of cu...
ABSTRACT This work presents the effects of metakaolin as a supplementary cementitious material in mortars for construction applications. Kaolin from Teleku Bokazo was calcined at 650oC and partially used to replace Portland limestone cement to produce mortars and paste. The metakaolin was successfully used in a cement paste and its effect observed in the different cement replacements proportions. The replacements ranged from 10% - 35% by mass and characterised after 3, 7, 14 and 28 days of c...
ABSTRACT Dye pollutants contaminate water bodies when they are improperly disposed into the ecosystem. Effects caused by the disposal of these dye pollutants include aesthetic pollution, eutrophication and perturbations in aquatic life. This work aims to mitigate these water contamination problems by studying possible degradation of these pollutant compounds. Semiconductor photocatalytic process using nanocrystalline TiO2 as the semiconductor catalyst was adopted in this work to photodegrade ...
ABSTRACT Nano titanium dioxide (TiO2) has been found to possess enhanced antibacterial properties and has thus been employed in various photocatalytic applications. Studies have confirmed higher photocatalytic activity when the TiO2 photocatalyst is doped with silver (Ag). The reported enhancement is due to valence band electrons being excited at longer wavelengths, hence extending absorbance further into the visible light region. For nano catalysts that interact in such a region, they are te...
ABSTRACT The low total conversion efficiency of dye sensitized solar cells have caused researchers to improve the individual components of the cell. This work aims to produce zinc oxide nanoparticles to help improve absorption and also reduce recombination in the photo anode of the dye-sensitized solar cell (DSSC). In this work, zinc oxide nanoparticles were produced using the hydrothermal synthesis technique and the annealing effect was conducted on the prepared samples. The samples prepared...
ABSTRACT This work presents the effects of metakaolin as a supplementary cementitious material in mortars for construction applications. Kaolin from Teleku Bokazo was calcined at 650oC and partially used to replace Portland limestone cement to produce mortars and paste. The metakaolin was successfully used in a cement paste and its effect observed in the different cement replacements proportions. The replacements ranged from 10% - 35% by mass and characterised after 3, 7, 14 and 28 days of cu...
ABSTRACT The current commercial production of biodiesel is via transesterification reaction, catalysed by homogeneous or heterogeneous catalysts. The most commonly used catalyst in biodiesel production is the homogeneous alkaline catalysts such as NaOH, KOH, CH3ONa and CH3OK. The choice of these catalysts is based on their higher kinetic reaction rates. However because of high cost of refined feedstocks and difficulties associated with the use of homogeneous alkaline catalysts to transesterif...
Abstract This work has investigated the corrosion behavior of low carbon steel subjected to four different modes of iso-thermal heat treatment and then immersed in a neutral buffer corrosive medium containing carbonate and chloride ions.The low carbon steel material was cut into twenty small pieces of length 18±2mm, put in groups of five and subjected to: Annealing, Hardening, Normalizing and tempering, each corresponding to an iso-thermal mode of treatment. The samples were ground and poli...
Abstract This study investigated the effect of magnesium and calcium as spheroidizers on the graphite microstructure in cast iron. The cast iron samples were melted in an induction furnace with charge of known composition and, magnesium and calcium of known percentages were added as spheriodizers to the molten metal in the mould during the casting process. From the microstructure of the as- cast specimens it was observed that the use of 100% Mg and a combined addition of 60% and 40%Ca as sph...
ABSTRACT The properties of cast iron grade GL 250 are dependent on the microstructures developed during casting. These microstructures are in turn dependent on the composition of the alloy, type of mould and other numerous casting practice variables such as shake-out time, pouring temperature, mould ambient conditions and inoculating technique. In this work, the effect of silicon content and shake-out time on the grain size (GS) and hardness properties of GL 250 cast iron was studied using a...
ABSTRACT Incinerator ash was investigated for its potential use as a replacement for sand and cement in concrete interlocking bricks. The physical characteristics of the raw materials were examined. Two sets of mixes were prepared. For the first set, sand and water quantities were fixed while incinerator ash was used at 0% to 100% replacement by weight for cement in steps of 10%. In the second set, incinerator ash was used at 0% to 100% replacement by weight for sand while cement and water q...
ABSTRACT This term paper contributions nanotechnology and dives into the world of nanotechnology and its and possibilities it can offer to the society The and nanomaterials immense impact of extends from its medical, ethical, mental, legal environmental applications, to fields such as engineering, biology, chemistry, computing, materials science, and communications. Alas, nothing is ever as it seems and perf...
Investigation of the low carbon steel bends into different angles with dimension 50 mm X 20 mm and then plated in Nickel bath at 3V for 25 minutes subjected to NaCl and H2SO4 corrosive environment. This research investigated the corrosion resistance of nickel- plated and un-plated low carbon steel and in a corrosive environment of H2SO4 and NaCl solutions. Weight loss method was used for estimation the corrosion rate in the current study. Low carbon steel sample was nickel electroplated at�...
The quality of castings in a green sand mould is influenced significantly by its properties, such as green compression strength, permeability, mould hardness, and others, which depend on input parameters. The relationships of these properties with the input parameters, like sand grain size and shape, binder, water, clay, etc. are complex in nature. The goal of this paper is to determine the green sand mould compressive strength in case of input parameters. A good moulding sand however, must p...
Abstract This research technically aims at utilizing stone dust as reinforcement to check the mechanical properties of Al(6063) with different weight ratio of the reinforcement. The alloy consisting of 0, 2, 6 and 10 wt% of the reinforcements were produced using double stir casting method. Evaluation of the microstructure, percentage porosity check, measurement of density and mechanical properties of the composites produced were used to check the performance levels of the composite produced. ...