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Influence of aging conditions upon the properties of calcined clay and its performance as supplementary cementitious material
Affiliation: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;1. Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Mail Stop: 90R3111, Berkeley, CA 94720, USA;2. Department of Civil, Architectural, and Environmental Engineering, 301 E. Dean Keeton St., C1748, The University of Texas at Austin, Austin, TX 78712, USA;3. Department of Civil Engineering, 2118 Fiedler Hall, Kansas State University, Manhattan, KS 66506, USA;1. Centro de Estudios de Química Aplicada, Universidad Central de Las Villas, 54830 Santa Clara, Cuba;2. Laboratory of Construction Materials, IMX, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland;3. Centro de Investigaciones de Soldadura, Universidad Central de Las Villas, 54830 Santa Clara, Cuba;4. Centro de Investigación y Desarrollo de Estructuras y Materiales, Universidad Central de Las Villas, 54830 Santa Clara, Cuba
Abstract:The investigation aimed at determining a possible impact of various aging conditions on calcined clays and their performance as supplementary cementitious material (SCM). Two calcined clays were exposed to six different aging conditions. Chemo-mineralogical and physical parameters were measured to reveal possible changes. Aging of calcined clays at high relative humidity or in 3% CO2 atmosphere resulted in a higher specific surface area and an increased water demand. This was in part due to the formation of calcite and gypsum. The latter promoted the development of heat of hydration. The aging of calcined clays itself had negligible influence on fresh mortar properties and no clear effect on strength of mortar made with these SCM. Nonetheless, most flexural and compressive strength values of mixes containing 20% aged calcined clay were higher than the reference mixes made with cement only.
Keywords:Calcined clay  Aging  Storage condition  Cement  Hydration  SCM
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