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Industrial Wastes as Alternative Mineral Addition in Portland Cement and as Aggregate in Coating Mortars

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      Abstract

      This paper presents an evaluation study of wastes from pulp and paper as well as construction and demolition industries for application in cement-based materials. The alternative raw materials were used as a source of calcium carbonate (CaCO3) and as pozzolanic material (water-reactive SiO2) in partial replacement of Portland cement. In addition to the hydraulic binder, coating mortars were composed by combining the pulp and paper fluidized bed sand residue with construction and demolition wastes, both added as small aggregates. Rheological and mechanical characterization showed that the waste additions changed the behavior of the cement materials, increasing both the viscosity of the pastes (at constant shear stress or rate). The formation of agglomerates in the cement hydration process made the mortars with additions of residues (lime and ash sludge) have an increase in the mechanical strength of the hardened bodies when compared to the mortar (M0W) prepared only with the residues (fluidized bed sand and C & D) as aggregates.

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      Measurement of the Rheological Properties of High Performance Concrete: State of the Art Report

      The rheological or flow properties of concrete in general and of high performance concrete (HPC) in particular, are important because many factors such as ease of placement, consolidation, durability, and strength depend on the flow properties. Concrete that is not properly consolidated may have defects, such as honeycombs, air voids, and aggregate segregation. Such an important performance attribute has triggered the design of numerous test methods. Generally, the flow behavior of concrete approximates that of a Bingham fluid. Therefore, at least two parameters, yield stress and viscosity, are necessary to characterize the flow. Nevertheless, most methods measure only one parameter. Predictions of the flow properties of concrete from its composition or from the properties of its components are not easy. No general model exists, although some attempts have been made. This paper gives an overview of the flow properties of a fluid or a suspension, followed by a critical review of the most commonly used concrete rheology tests. Particular attention is given to tests that could be used for HPC. Tentative definitions of terms such as workability, consistency, and rheological parameters are provided. An overview of the most promising tests and models for cement paste is given.
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        Caracterização reológica de pasta cimentícia: associação de técnicas complementares

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          Revisão: conceitos de dispersão e empacotamento de partículas para a produção de concretos especiais aplicados na construção civil

          O concreto material de construção mais amplamente utilizado está constantemente evoluindo. Nos últimos anos, muitas pesquisas têm sido desenvolvidas e a busca por materiais com desempenho mecânico e de durabilidade cada vez maiores tem sido o alvo dos pesquisadores da tecnologia dos concretos. Tais materiais permitem que os projetistas e arquitetos o usem eficientemente em edifícios altos, além de serem esteticamente mais interessantes. Para tanto, concretos obtidos a partir da engenharia de microestrutura são necessários. Por serem compósitos constituídos de partículas com granulometria fina (tamanho máximo < 4750 μm) e uma baixa relação água/cimento, esses concretos apresentam matrizes densas obtidas a partir da otimização do empacotamento dos materiais granulares, enquanto a trabalhabilidade adequada é obtida com a dispersão das partículas promovida pela incorporação de aditivos químicos à mistura. Além disso, utilizam adições minerais que são, na grande maioria, subprodutos industriais, resultando em um grande benefício ambiental: reciclagem de resíduos industriais, redução de emissões poluidoras durante a produção do cimento, preservação de matérias-primas e economia de energia. Assim, no presente artigo, uma revisão sobre os conceitos de dispersão e empacotamento de partículas foi realizada, direcionando-se para os concretos especiais aplicados na construção civil.
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            Author and article information

            Affiliations
            Florianópolis Santa Catarina orgnameUniversidade Federal de Santa Catarina orgdiv1Laboratory of Glass-Ceramic Materials orgdiv2Graduate Program in Materials Science and Engineering Brazil
            Criciúma orgnameUniversidade do Extremo Sul Catarinense orgdiv1Graduate Course in Environmental Engineering, Laboratory of Technical Ceramics Brazil
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            mr
            Materials Research
            Mat. Res.
            ABM, ABC, ABPol (São Carlos, SP, Brazil )
            1516-1439
            1980-5373
            September 2017
            : 20
            : suppl 2
            : 358-364
            S1516-14392017000800358 10.1590/1980-5373-mr-2016-1139

            This work is licensed under a Creative Commons Attribution 4.0 International License.

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            Figures: 0, Tables: 0, Equations: 0, References: 35, Pages: 7
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            Product Information: SciELO Brazil

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