TY - GEN A1 - Msinjili, Nsesheye S. A1 - Vogler, Nico A1 - Sturm, Patrick A1 - Neubert, Markus A1 - Schröder, Hans-Jürgen A1 - Kühne, Hans-Carsten A1 - Hünger, Klaus-Jürgen A1 - Gluth, Gregor J. G. T1 - Calcined brick clays and mixed clays as supplementary cementitious materials: Effects on the performance of blended cement mortars T2 - Construction and Building Materials N2 - While calcined clays in general have been credited with a great potential to mitigate CO2 emissions related to cement production and consumption, calcined brick clays are currently understudied in this regard. In the present work, two brick clays, a low-grade kaolinitic clay, and a mixed clay composed of 50% brick clay and 50% low-grade kaolinitic clay were studied regarding transformations on calcination, and strength and durability performance as well as pore structure of mortars made with the blended cements. All calcined clays exhibited pozzolanic reactivity, with the performance of the brick clays inferior to the low-grade kaolinitic clay. However, the mixed clay performed very similar to the low-grade kaolinitic clay, which points to a viable option for optimal use of brick clays in cementitious systems. The carbonation resistance of the blended cement mortars was generally worse than that of the plain Portland cement mortar, as expected, but the former exhibited a significantly improved chloride penetration resistance. The latter improvement was due to pore structure refinement in the blended cement mortars, compared to the Portland cement mortar. KW - Brick clay KW - Illite KW - Calcined clay KW - Blended cement KW - Carbonation KW - Chloride penetration Y1 - 2021 U6 - https://doi.org/10.1016/j.conbuildmat.2020.120990 SN - 0950-0618 VL - 266 ER -