The effectiveness of Potassium Aluminum Sulphate (Alum), Di-ammonium Hydrogen Phosphate and Ammon... more The effectiveness of Potassium Aluminum Sulphate (Alum), Di-ammonium Hydrogen Phosphate and Ammonium Chloride as flame-retardant was studied by incorporating various concentrations of the flameretardants into a grass commonly used as roofing thatch. Flammability test were carried out and the results show that the flame propagation rate, flame duration time and after-glow time decreased while ignition time and percentage add-on increased. These results are interpreted on the fact that on heating, these flameretardants evolve substances that compete with the chemistry of pyrolysis / combustion of this grass.
The goal of this research work is to develop a better way of handling the problems caused by the ... more The goal of this research work is to develop a better way of handling the problems caused by the failures of cement concrete structures by forming cement-polymer composites and identifying the best composite for targeted product. Polyvinylchloride(PVC) and Polyethylene(PE) were ground into fine powder of 2.55mm mesh size and were compounded with Portland cement at various concentrations of 0.0%, 0.1%, 0.5%, 1.0%, 3.0%, 7.0% and 25.0% of pure Portland cement. Physico-chemical properties of the cement-polymer composites produced were analysed and the results obtained were compared with pure Portland cement which served as the control. The results show that abrasion resistance and hardness of the composites increased, except at some concentration while water imbibition, electrical and thermal conductivities of the composites decreased as the polymer concentrations increased. It is observed that 7.0% concentration of both polymers gave the best composites when hardness and abrasion resistance is required. 7.0% PE concentration gave the best PE composite for electrical conductivity and water imbibition while 25.0% PVC concentration gave the best PVC composite for electrical conductivity and water imbibition.
The effectiveness of Potassium Aluminum Sulphate (Alum), Di-ammonium Hydrogen Phosphate and Ammon... more The effectiveness of Potassium Aluminum Sulphate (Alum), Di-ammonium Hydrogen Phosphate and Ammonium Chloride as flame-retardant was studied by incorporating various concentrations of the flameretardants into a grass commonly used as roofing thatch. Flammability test were carried out and the results show that the flame propagation rate, flame duration time and after-glow time decreased while ignition time and percentage add-on increased. These results are interpreted on the fact that on heating, these flameretardants evolve substances that compete with the chemistry of pyrolysis / combustion of this grass.
The goal of this research work is to develop a better way of handling the problems caused by the ... more The goal of this research work is to develop a better way of handling the problems caused by the failures of cement concrete structures by forming cement-polymer composites and identifying the best composite for targeted product. Polyvinylchloride(PVC) and Polyethylene(PE) were ground into fine powder of 2.55mm mesh size and were compounded with Portland cement at various concentrations of 0.0%, 0.1%, 0.5%, 1.0%, 3.0%, 7.0% and 25.0% of pure Portland cement. Physico-chemical properties of the cement-polymer composites produced were analysed and the results obtained were compared with pure Portland cement which served as the control. The results show that abrasion resistance and hardness of the composites increased, except at some concentration while water imbibition, electrical and thermal conductivities of the composites decreased as the polymer concentrations increased. It is observed that 7.0% concentration of both polymers gave the best composites when hardness and abrasion resistance is required. 7.0% PE concentration gave the best PE composite for electrical conductivity and water imbibition while 25.0% PVC concentration gave the best PVC composite for electrical conductivity and water imbibition.
Uploads
Papers by Okoro Victor