Abstract
The aim of this study was to determine the optimum design mix to produce pre-cast concrete blocks by a completely random experimental design (CRED) with mixture and process variables. The polymerized concrete was studied its composition: Cement, and water defined as the mixture compounds. To choose the best model, all the possible models were assessed through the ANOVA, which tested each possible model. The linear-linear model was preferred, since that do not present evidence of lack of fit, and it is capable of relating how to react the process variables, when are changed the variable mixture condition levels. The optimum experimental condition, obtained for the polymerized concrete, was: The size of the polystyrene beads was 4.8 mm sized polystyrene beads, 5.0% polystyrene that replaced the aggregate, 18.3% cement, 73.4% aggregate and 8.3% water. In this condition, the blocks made with polymerized concrete show a compressive strength above 15 Mpa, allowing its utilization in paving.
Highlights
The use of raw materials in the civil construction industry has been very intense in recent years
The use of these residues, in partial or total substitution, of raw material in the civil construction industry, is a constant source of research [1]-[8]. It increases concerns, relating to the amount of solid residue from industry, which is overcrowding the landfill; more consistently to stimulate this kind of research. This investigation has stimulated the interest of researchers seeking new ways of using industrial waste as a solution for both shortage of natural resources for civil construction industry and the necessity of alternatives for the final destination of industrial waste
Due to the degree freedom number, between the others combined models possible only two models were examined. These models were: the linear [Equation (2)] and bilinear [Equation (3)] process variable models combined with the linear mixture model [Equation (4)].The others combined models embodying the others mixture models [(Equations (5) and (6)], require bigger numbers of degree freedom, which the experimental design carried out, in this study, cannot provide
Summary
The use of raw materials in the civil construction industry has been very intense in recent years. The same economic growth expands the consumption of durable goods throughout their supply chain, it is responsible for generating an amount of industrial waste The use of these residues, in partial or total substitution, of raw material in the civil construction industry, is a constant source of research [1]-[8]. It increases concerns, relating to the amount of solid residue from industry, which is overcrowding the landfill; more consistently to stimulate this kind of research This investigation has stimulated the interest of researchers seeking new ways of using industrial waste as a solution for both shortage of natural resources for civil construction industry and the necessity of alternatives for the final destination of industrial waste. This type of application could allow the optimization of the natural resources without loss of quality of the final product
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