Clay Activation and Color Modification in Reducing Calcination Process: Development in Lab and Industrial Scale

  • Fabiano F. Chotoli
  • Valdecir A. Quarcioni
  • Sérgio S. Lima
  • Joaquim C. Ferreira
  • Guilherme M. Ferreira
Conference paper
First Online:
Part of the RILEM Bookseries book series (RILEM, volume 10)

Abstract

Calcined clays have been used in pozzolanic portland cement manufacturing in Brazil for many years. However, their color imposes commercial limitation when cements show reddish or pinkish hues. This work presents two case studies consisting of reducing process calcination of two clays by reducing process in: electric static furnace to obtain maximum temperature (700–1000 °C) and burning time (5–20 min) conditions, as a function of color and pozzolanic reactivity, and; rotary kiln for both laboratorial and industrial scales. Chemical (XRF, TGA/DTA), mineralogical (XRD), physical-mechanical (compressive strength), pozzolanic reactivity (Chapelle´s method and Strength Activity Index) and color test (colorimeter spectrometer using CIE color system standard) were applied in clays and pozzolanic cements characterization. Results show satisfactory performance of grayish pozzolanic cements, and indicate an alternative process to obtain calcined clays according to cements specifications.

Keywords

Compressive Strength Pozzolanic Reactivity Rotary Kiln Petroleum Coke Compressive Strength Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© RILEM 2015

Authors and Affiliations

  • Fabiano F. Chotoli
    • 1
  • Valdecir A. Quarcioni
    • 1
  • Sérgio S. Lima
    • 1
  • Joaquim C. Ferreira
    • 2
  • Guilherme M. Ferreira
    • 2
  1. 1.Instituto de Pesquisas Tecnológicas Do Estado de São Paulo (IPT) - Laboratório de Materiais de Construção CivilSão PauloBrazil
  2. 2.Dynamis Mecânica AplicadaSão PauloBrazil

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