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Erschienen in:
2018 | OriginalPaper | Buchkapitel
Progress of Limestone Calcined Clay Cement in China
verfasst von : Sui Tongbo, Bin Wang, Yuliang Cai, Shengliang Tang
Erschienen in: Calcined Clays for Sustainable Concrete
Verlag: Springer Netherlands
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Abstract
Waste materials from kaolinite processing was identified with a content of 46% of kaolinite and calcined and used for preparing Limestone Calcined Clay Cement (LC3). It has been found that thermal history of activation in the range of temperature from 750–800 °C does not change much the reactivity of the calcined kaolinitic clay based on strength test. R3 (rapid, relevant and reliable) calorimetry test method was also used for assessing the reactivity of calcined kaolinitic clay, which gives a result in good agreement with mortar strength test. The comparison test reveals that the reduction of flowability due to the addition of calcined clay can be compensated with the combination of limestone, and that the compressive strength of LC3-50 can have equivalent strength to the pure Portland cement, indicating the high reactivity of calcined clay and the synergy when combined with limestone. The design of a flash calciner with a capacity of 600t/d and thermal consumption of 620 kcal/kg in average is also introduced.