Abstract:
Investigated the utilization of spent silica-alumina for making pavement which is composed of concrete block and floortile. The first experiments were performed to determined not only the factors affecting the solidification process, but also the physical properties of the concrete block standard, such as the compressive strength, density and permeability. In addition, the extraction tests on anthraquinones were carried out. A total of three kinds of experiments were performed. The first experiment was performed by using the spent silica-alumina/cementitious binder ratios of 0, 0.25, 0.50, 0.75 and 1.00 and water/cementitious binder ratios of 0.4, 0.5, 0.6 and 0.7. The second experiment indicated the effect of varying curing time of the solidified specimens at 1, 3, 7, 14, 21 and 28 days. The third experiment considered the stabilization efficiencies of anthraquinones and the cost estimation of the proper binder for making concrete block. The results obtained from making concrete block (20x15x5 cm.) from spent silica-alumina and cement indicated that the optimum conditions were present spent silica-alumina/cementitious binder ratio of 0.25 at a water/cement ratio of 0.5. By using these ratios, the best compressive strength, density and permeability was chosen along with a curing time of 7 days. The stabilization efficiency of anthraquinone was about 72%. The estimation of treatment costs were about 3.76 Baht/3 kg. concrete block. In the economic study, the optimum conditions consisted of a spent silica-alumina/cementitious binder ratio of 0.50 at a water/cement ratio of 0.6 and curing time of 14 days. The estimation of treatment costs were about 3.30 Baht/3 kg. concrete block. In the second experiments were performed to determine not only the factors affecting the making of floortile, but also the physical properties of the floortile standard, such as the compressive strength, density, permeability, chemical tolerance and compressive strength tolerance. In addition, the extraction tests on anthraquinones were carried out. There were three experiments. The first experiment was performed by using spent silica-alumina/clay ratios of 0, 0.25, 0.50, 0.75 and 1.00. The second experiment indicated the effect of varying temperatures where making floortile at 800, 1000 and 1200 celcius degrees. The third experiment considered the stabilization efficiencies of anthraquinones and cost estimation of the proper binder for making floortile. The results for making floortile (10x10x1 cm.) from spent silica-alumina and clay indicated that the optimum conditions consisted of a spent silica-alumina/cementitious binder ratio of 0.25 at a temperature of 1200 celcius degrees. By using the above ratios and a curing time of seven days, the best values of compressive strength, density and permeability were obtained. These ratios produced the best compressive strength, density, permeability, chemical tolerance and compressive strength tolerance. The cost estimation was about 7.29 baht/floortile. In the economic study, the optimum conditions consisted of a spent silica-alumina/clay ratio of 0.25 at a temperature 800 of celcius degrees. The estimation of treatment costs were about 7.19 baht/floortile. AT both temperature, the stabilization efficiency of anthaquinone was about 99.98%