Paper Title :Calcined Clays and Marl Limestone as Partial Cement Substitutes

Author :Pagona Maravelaki

Article Citation :Pagona Maravelaki , (2023 ) " Calcined Clays and Marl Limestone as Partial Cement Substitutes " , International Journal of Advances in Mechanical and Civil Engineering (IJAMCE) , pp. 81-85, Volume-10,Issue-3

Abstract : Three clay samples from the west area of Chania, Crete, Greece were calcined at 600 oC and reacted with saturated lime, to assess their pozzolanic activity for potential use as cement substitutes. Marl limestone was calcined at 800 oC and then hydrated to assess its binding capacity. The silica and alumina minerals of the calcined clays and marl limestone after reaction with lime and hydration, respectively,yielded calcium silicate hydrate (CSH) and calcium aluminate hydrate (CAH), which contribute to the hardening of plasters and mortars. Infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermal analysis (DTA-TG) indicated the evolution of CSH and CAH over time through the progressive reduction of portlandite and the identification of CSH and CAH. In the clay with the lower calcite and higher kaolinite content the lime consumption over time is more rapid than that of the other clays. Therefore, this clay can be effectively used as an addition to cement mortars to provide a hydraulic binder.Calcined marl limestone can effectively substitute part of cement due to the hydraulic compound formation uponhydration. Keywords - Calcined Clays, Calcined Marl Limestone, Pozzolanic Activity, Hydration, Cement Substitution

Type : Research paper

Published : Volume-10,Issue-3

	|		PDF	|	Viewed - 11	|	Published on 2023-10-14