Optimization of Expanded Polystyrene Lightweight Aggregate in Pre-Cast Concrete Blocks by a Completely Random Experimental Design (CRED) with Mixture and Process Variables
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.
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