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

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Open Journal of Statistics 2016年第4期6卷 594-604页

作者： raimundo kennedy vieira raimundo Pereira de Vasconcelos Douglas Marangoni Adalena kennedy vieira Nutec Federal University of Amazonas (UFAM) Manaus (AM) Brazil Center Foundation of Analyses Research and Technological—FUCAPI Manaus (AM) Brazil

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.

关键词： Experimental Design CRED Polymerized Concrete

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A Methodology for Collection of Residential Construction Residue in Manaus

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Journal of Environmental Science and Engineering(A) 2012年第9期1卷 1149-1162页

作者： Luciane Farias Ribas Guiherme Chagas Cordeiro Adalena kennedy vieira raimundo kennedy vieira Graduate School of Research and Engineering Federal University of Rio de Janeiro Rio de Janeiro 21945-970 Brazil Science and Technology Center State University of Norte Fluminense Darcy Ribeiro Campos dos Goytacazes 28013-600 Brazil Superior School of Technology Amazonas State University Manaus 690055-010 Brazil Techonology Faculty Federal University of Amazonas Manaus 69077-000 Brazil

Civil construction is one of the largest consumers of raw materials and producers of waste, which has been causing environmental problems both through the extraction of raw materials and through building activity by generation of waste. Notwithstanding the need to find an optimum use for solid construction residue to try to solve or minimize this problem, there are no standards for the process of obtaining the CDR (construction and demolition residue). Thus, the aim of this study was to develop a method of collecting solid waste at the construction site that is easy and low-cost and thus can be applied throughout the construction industry. This collection method was designed to produce residue with the desired proprieties and obtain the best possible homogeneity. This method permitted to evaluate the factors generating construction residue more precisely.

关键词：残留住宅建设收集民用建筑固体废物生产废水环境问题施工现场

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