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Properties of Calcined Lias Delta Clay—Technological Effects, Physical Characteristics and Reactivity in Cement

  • N. BeuntnerEmail author
  • K. Ch. Thienel
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)

Abstract

The investigation reveals chances for calcined clay comprising a mixture of different clay minerals as supplementary cementitious material. There is ample supply in southern Germany of the source material with its quartzous clay combined with a high content of mica and other clay minerals. Its content of kaolinite is less than 25 % by mass. The calcinations were done following two different procedures. On laboratory scale the raw clay was dried initially, crushed to a maximum particle size of less than 4 mm and subsequently calcined in small quantities of 50 g in a muffle furnace. On an industrial scale the raw clay was crushed coarse to a maximum particle size of 100 mm and subsequently fed in campaigns of 180 tons each into a tripartite rotary kiln normally used for the production of expanded clay. The resulting calcined clay particles had a maximum size up to 40 mm. Characteristic chemo-mineralogical properties and physical parameters (e.g. mineral composition and amorphous content, lime-retention, ion solubility in alkaline medium and BET-surface) of the calcined clays were measured. The comparison of the clays calcined in the laboratory and those calcined on industrial scale revealed a broader optimum temperature range for the latter accompanied by a partially reduced pozzolanic reactivity when used in combination with cement.

Keywords

Clay Mineral Industrial Scale Calcium Hydroxide Inductively Couple Plasma Optical Emission Spectrometry Expanded Clay 
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

  1. 1.University of the Federal Armed ForcesMunichGermany

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