Development of a new rapid,relevant and reliable (R3) test method to evaluate the pozzolanic reactivity of calcined kaolinitic clays |
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| Affiliation: | 1. Laboratory of Construction Materials, EPFL STI IMX LMC Station 12, CH-1015 Lausanne, Switzerland;2. Sustainable Materials Management, VITO, 2400 Mol, Belgium;3. Centro de Estudios de Quimica Aplicada, Universidad Central de Las Villas, 54830 Santa Clara, Cuba;4. Heidelberg Technology Center GmbH, Rohrbacher Str. 95, 69181 Leimen, Germany;1. Division Geology, Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, 3001 Leuven, Belgium;2. Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark;3. Building Materials and Building Technology, Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 44, 3001 Leuven, Belgium |
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| Abstract: | The present paper introduces a new rapid, relevant and reliable (R3) test to predict the pozzolanic activity of calcined clays with kaolinite contents ranging from 0 to 95%. The test is based on the correlation between the chemical reactivity of calcined clays in a simplified system and the compressive strength of blends in standard mortar. The simplified system consists of calcined clay portlandite and limestone pastes with sulfate and alkali levels adjusted to reproduce the reaction environment of hydrating blended cements. The pastes were hydrated for 6 days at 20 °C or for 1 day at 40 °C. The chemical reactivity of the calcined clay can be obtained first by measurement of the heat release during reaction using isothermal calorimetry and second by bound water determination in a heating step between 110 °C and 400 °C.Very good correlations were found between the mortar compressive strength and both measures of chemical reactivity. |
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