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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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      Most cited references 17

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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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        Ceramic formulations prepared with industrial wastes and natural sub-products

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          Caracterização Reológica de Pasta Cimentícia: associação de técnicas complementares

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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
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            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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