S. L. Correia

Centro Universitário - Católica de Santa Catarina, Joinville, Santa Catarina, Brazil

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Publications (26)21.84 Total impact

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    ABSTRACT: The use of metakaolin is known to help improve properties of Portland cement-based mortars. The presumed similarities between the characteristics of metakaolin and those of a powdered (<45 μm) fired clay brick clean waste (CBW) led to the investigation of the effect on the durability of mortars of partial replacement (10, 25 and 40 wt.%) of Portland cement by CBW. Properties such as 28 and 90 days-compressive strength, water absorption, apparent porosity, absorption by capillarity, chloride retention, carbonation depth and sulphate resistance were evaluated. The CBW-containing cured mortars showed improved strength and density, as the result of combined physical and pozzolanic pore filling effect of added CBW. However, CBW-free mortar exhibited larger spreading and, being more porous, higher sulphate resistance and ability to absorb chlorides. Optimum performance was found for the 40 wt.% CBW mortar whose compressive strength can be up to 130% higher than that of the CBW-free mortar.
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    ABSTRACT: A fresh green sand, spent green sand, and a weathered spent green sand (wSGS) from a foundry landfill were analyzed using diffractometry, electron microscopy, fluorometry, granulometry, spectrometry, and thermogravimetry (TG). Our objective was to understand how the physicochemical properties of the foundry green sands change from their original form after being subjected to the casting process, then after weathering at the landfill. A quantitative phase composition model was also postulated for each material based on the TG results and it was found to be the most reliable and informative quantitative data for this type of residue. The weathered sample, that remained in a landfill for two years, was found to be composed of almost pure sand. Because of the weathering process, it may be possible to use the wSGS as a virgin sand replacement in the regeneration system or in geotechnical applications where bentonite would affect the properties of the final product.
    Thermochimica Acta 09/2012; 543:150–155. DOI:10.1016/j.tca.2012.05.018 · 2.11 Impact Factor
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    ABSTRACT: In industrial practice involving mixtures of raw materials, it is desirable to be able to predict how a change in their proportions will affect the product's properties. In this work the effect of three major vulcanized rubber raw materials was investigated. All other raw materials, as well as processing conditions, were kept constant. Ten formulations were vulcanized by compression moulding (175 °C, ∼17 MPa, during 5 minutes) and characterized. The statistically valid property equations calculated from the characterization results show that a range of compositions exists within which the final product has the desired properties and can still be comfortably manufactured.
    Macromolecular Symposia 09/2012; 319(1). DOI:10.1002/masy.201100166
  • S. L. Correia, D. Hotza, A. M. Segadães
    02/2011; 44(1):53-58. DOI:10.3989/cyv.2005.v44.i1.403
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    ABSTRACT: This paper presents results from an investigation on the potential use of waste vulcanized rubber scrap (WRS) particles as aggregate in construction mortars. The investigation was carried out using a 32 factorial design of experiments and the response surface methodology. Mortar mixtures were prepared using WRS as fine aggregate (10, 20 and 30 vol.%) with water/cement ratios of 0.52, 0.55 and 0.60. Fresh mortar consistency index and hardened mortar 28-day compressive strength were evaluated. The influence of the WRS content on the physical and mechanical properties was established, and the suitability of WRS use in a mortar application was demonstrated.
    Composite Structures 08/2010; DOI:10.1016/j.compstruct.2009.11.007 · 3.12 Impact Factor
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    ABSTRACT: Recycling of industrial wastes and by-products can help reduce the cost of waste treatment prior to disposal and eventually preserve natural resources and energy. To assess the recycling potential of a given waste, it is important to select a tool capable of giving clear indications either way, with the least time and work consumption, as is the case of modelling the system properties using the results obtained from statistical design of experiments. In this work, the aggregate reclaimed from the mud that results from washout and cleaning operations of fresh concrete mixer trucks (fresh concrete waste, FCW) was recycled into new concrete with various water/cement ratios, as replacement of natural fine aggregates. A 3(2) factorial design of experiments was used to model fresh concrete consistency index and hardened concrete water absorption and 7- and 28-day compressive strength, as functions of FCW content and water/cement ratio, and the resulting regression equations and contour plots were validated with confirmation experiments. The results showed that the fresh concrete workability worsened with the increase in FCW content but the water absorption (5-10 wt.%), 7-day compressive strength (26-36 MPa) and 28-day compressive strength (32-44 MPa) remained within the specified ranges, thus demonstrating that the aggregate reclaimed from FCW can be recycled into new concrete mixtures with lower natural aggregate content.
    Waste Management 08/2009; 29(11):2886-91. DOI:10.1016/j.wasman.2009.06.014 · 3.16 Impact Factor
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    ABSTRACT: The ceramics industry, given the high volume of materials processed, stands as one of the largest consumers of natural raw materials but has also the capacity and potential to make significant contributions to solving environmental problems associated with other industries rejects. This work investigates the effects of quartz sand replacement by agate rejects (scrap) in a traditional triaxial porcelain composition. The study was carried out using the design of experiments (DoE) method. Characterization results were used to calculate statistically significant and valid regression equations, relating dried and fired body properties with clay, feldspar and agate scrap contents in the unfired mixture. The regression models were then discussed against X-ray diffraction and scanning electron microscopy results and used simultaneously to delimit the combinations of those three raw materials most adequate to produce a porcelainized stoneware floor tile with specified properties. Thus, an alternative use of an otherwise waste material is proposed, which can be translated into economic benefits and an important and welcome relief on environmental and waste disposal concerns.
    Journal of Hazardous Materials 08/2008; 163(1):315-22. DOI:10.1016/j.jhazmat.2008.06.094 · 4.33 Impact Factor
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    ABSTRACT: The simultaneous effect of raw materials type and content on physical and technological properties of a triaxial ceramics system has been studied in the range of values used in industrial practice. The investigation has been carried out using the statistical design of mixture experiments, a special case in response surface methodologies. Ten formulations of the three raw materials selected were used in the experimental design. Those formulations were processed under conditions similar to those found in the ceramics industry: powder preparation (wet grinding, drying, granulation and humidification), green body preparation (pressing and drying) and firing. A non-linear programming approach was applied to minimize the cost of the three-component ceramics, considering optimum ranges of bulk density, bending strength, water absorption and porosity of sintered bodies. A validation experiment was performed to confirm the optimized composition predicted.
    Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2, 03/2008: pages 219 - 224; , ISBN: 9780470291221
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    Materials Science Forum 01/2008; DOI:10.4028/www.scientific.net/MSF.591-593.854
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    Materials Science Forum 01/2008; 591-593:679-684. DOI:10.4028/www.scientific.net/MSF.591-593.679
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    Sivaldo L. Correia, Dachamir Hotza, Ana M. Segadães
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    ABSTRACT: This work describes the relationships observed between the porosity of fired ceramic test pieces and the raw materials contents in the unfired mixture. The investigation was carried out using the mixture experiments design approach coupled with response surface methodology, which enables the calculation of statistically significant models for the properties from a limited number of experimental results. Ten formulations of a clay mixture, potash feldspar and quartz sand were processed in the laboratory under fixed conditions, similar to those used on wall and floor tile industrial practice, and characterized. Closed porosity (CP) was estimated from the analysis of back-scattered SEM photomicrographs, open porosity (OP) was calculated as the product of bulk density and water absorption, and total porosity (TP) was calculated from OP and CP values. Characterization results were used to calculate statistically significant and valid regression equations, relating those properties with the raw material contents in the unfired mixture. For the particular raw materials and processing conditions used, the models clearly show how quartz contributes to increasing OP and the crucial role played by feldspar when CP and TP are to be minimized (circa 3 vol.%), and how the clay content can counteract that effect and lead to maximum closed porosity (∼14 vol.%).
    Journal of Materials Science 12/2007; 43(2):696-701. DOI:10.1007/s10853-007-2188-3 · 2.31 Impact Factor
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    ABSTRACT: The effect of raw materials type and content on the properties of clay–feldspar–quartz compositions was studied using the statistical design of mixture experiments. Based on wall and floor tile industrial practice, 10 mixtures of three raw materials were selected and processed. Characterization results were used to calculate statistically significant and valid regression equations, relating fired body properties with clay, feldspar, and quartz contents in the unfired mixture. Such statistical modeling is discussed against quantitative X-ray diffraction and scanning electron microscopy results. The glassy phase present was found to control the microstructure and the mechanical strength of the fired ceramic body.
    Journal of the American Ceramic Society 08/2006; 89(11):3356 - 3365. DOI:10.1111/j.1551-2916.2006.01245.x · 2.43 Impact Factor
  • Materials Science Forum 01/2006; DOI:10.4028/www.scientific.net/MSF.530-531.486
  • Materials Science Forum 01/2006; 514-516:1424-1428. DOI:10.4028/www.scientific.net/MSF.514-516.1424
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    S. L. Correia, D. Hotza, A. M. Segadães
    Cerâmica 09/2005; 51(319):230-238.
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    Materials Science Forum 01/2005; DOI:10.4028/www.scientific.net/MSF.498-499.447
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    Sivaldo Leite Correia, K A S Curto, Dachamir Hotza, Ana M. Segadães
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    ABSTRACT: In the development and manufacture stages of floor and wall ceramic tiles, firing shrinkage is basically determined by the combination of raw materials and frequently used as quality control parameters. This configures the ideal scenario to apply the techniques of experiments design, often used in various other areas, to model those properties of such ceramics bodies. In this work, ten formulations of three different raw materials, namely a clay mixture, potash feldspar and quartz (triaxial compositions) were selected and processed under conditions similar to those used in the ceramics industry. With the experimental results, a regression model was calculated, relating linear shrinkage with composition. After statistical analysis and verification experiments, the significance and validity of the model was confirmed. The regression model can then be used to select the best combination of those three raw materials to produce a ceramic body with specified properties.
    Materials Science Forum 01/2005; 498-499. DOI:10.4028/www.scientific.net/MSF.498-499.430
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    ABSTRACT: Due to the simplicity of experimental determination and sensitivity to raw materials and/or processing changes, bending strength is frequently used as a quality control parameter in the development and manufacture stages of floor and wall ceramic tiles. This configures the ideal scenario to apply the techniques of experiments design, often used in a lot of other areas, to model the dry bending strength of such ceramics bodies. In the present study, three different raw materials, namely a clay mineral, sodium feldspar and quartz, were selected and eight formulations thereof (triaxial compositions) were used to obtain the limiting conditions of the experiments design. Those formulations were then processed under conditions similar to those used in the ceramics industry: powder preparation (wet grinding, drying, granulation and humidification), green body preparation (pressing and drying) and characterization. The use of this methodology enabled the calculation of a regression model relating the dry bending strength with composition. After statistical analysis and a verification experiment, the significance and validity of the special-cubic model obtained was confirmed.
    Journal of the European Ceramic Society 08/2004; 24(9-24):2813-2818. DOI:10.1016/j.jeurceramsoc.2003.09.009 · 2.31 Impact Factor
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    SL Correia, D Hotza, A M Segadães
    [Show abstract] [Hide abstract]
    ABSTRACT: In the development and manufacture stages of floor and wall ceramic tiles, firing shrinkage and water absorption are basically determined by the combination of raw materials and frequently used as quality control parameters. This configures the ideal scenario to apply the techniques of experiments design, often used in various other areas, to model those properties of such ceramics bodies. In the present study, 10 formulations of three different raw materials, namely a clay mixture, potash feldspar and quartz (triaxial compositions) were selected and used in the experiments design. Those formulations were processed under conditions similar to those used in the ceramics industry: powder preparation (wet grinding, drying, granulation and humidification), green body preparation (pressing and drying), firing (at 1170 • C) and characterization. With the experimental results, regression models were calculated, relating linear firing shrinkage and water absorption with composition. After statistical analysis and verification experiments, the significance and validity of the models were confirmed. The regression models can then be used to select the best combination of those three raw materials to produce a ceramic body with specified properties.
    Ceramics International 01/2004; 30(6):917-922. DOI:10.1016/j.ceramint.2003.10.013 · 2.09 Impact Factor
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    S. L. Correia, D. Hotza, A. M. Segadães
    Cerâmica 01/2004; 51(319). DOI:10.1590/S0366-69132005000300010

Publication Stats

123 Citations
21.84 Total Impact Points

Institutions

  • 2006–2015
    • Centro Universitário - Católica de Santa Catarina
      Joinville, Santa Catarina, Brazil
  • 2005–2012
    • Universidade do Estado de Santa Catarina
      Joinville, Santa Catarina, Brazil
  • 2004–2008
    • Federal University of Santa Catarina
      • Departamento de Engenharia Química e Engenharia de Alimentos
      Nossa Senhora do Destêrro, Santa Catarina, Brazil