An evaluation of the effects of additives and firing temperatures on clay bricks characteristics was studied.The two(2)additives used were sawdust ash(SDA)and iron ore tailing wastes(IOTW),and the five(5)firing temper...An evaluation of the effects of additives and firing temperatures on clay bricks characteristics was studied.The two(2)additives used were sawdust ash(SDA)and iron ore tailing wastes(IOTW),and the five(5)firing temperatures of 400o C to 1200o C at intervals of 200o C were applied.The fired bricks were tested for linear shrinkage,water absorption,density,and compressive strength.The results of the investigations showed that firing temperature improved the clay brick characteristics across all replacement levels.However,the SDA additions increased the linear shrinkage and the water absorption but decreased the density and compressive strength.On the other hand,the addition of IOTW to the clay-SDA mixture,reduced both the linear shrinkage and water absorption of the clay bricks,and increased the density and compressive strength.The statistical values and the regression models derived on the experimental data using Minitab 18 Software were significant.展开更多
An experimental investigation on rice husk ash(RHA)and Conplast SP 430(CP-admixture)was carried out to evaluate their effects on the paste characteristics(soundness,consistency,initial and final setting times).The cem...An experimental investigation on rice husk ash(RHA)and Conplast SP 430(CP-admixture)was carried out to evaluate their effects on the paste characteristics(soundness,consistency,initial and final setting times).The cement content used was 300g and the brand was‘Ashaka’Portland cement conforming to BS EN 121973.Various combinations of the mixtures OPC-RHA-CP-admixture were used to establish performance characteristics of the pastes.Statistical characteristics,and linear regression models(no-transformation,λ=0.5,and Box-Cox transformation)were developed on the experimental data for decisions on their performances。展开更多
文摘An evaluation of the effects of additives and firing temperatures on clay bricks characteristics was studied.The two(2)additives used were sawdust ash(SDA)and iron ore tailing wastes(IOTW),and the five(5)firing temperatures of 400o C to 1200o C at intervals of 200o C were applied.The fired bricks were tested for linear shrinkage,water absorption,density,and compressive strength.The results of the investigations showed that firing temperature improved the clay brick characteristics across all replacement levels.However,the SDA additions increased the linear shrinkage and the water absorption but decreased the density and compressive strength.On the other hand,the addition of IOTW to the clay-SDA mixture,reduced both the linear shrinkage and water absorption of the clay bricks,and increased the density and compressive strength.The statistical values and the regression models derived on the experimental data using Minitab 18 Software were significant.
文摘An experimental investigation on rice husk ash(RHA)and Conplast SP 430(CP-admixture)was carried out to evaluate their effects on the paste characteristics(soundness,consistency,initial and final setting times).The cement content used was 300g and the brand was‘Ashaka’Portland cement conforming to BS EN 121973.Various combinations of the mixtures OPC-RHA-CP-admixture were used to establish performance characteristics of the pastes.Statistical characteristics,and linear regression models(no-transformation,λ=0.5,and Box-Cox transformation)were developed on the experimental data for decisions on their performances。