Influence of supplementary cementitious materials on water transport kinetics and mechanical properties of hydrated lime and cement mortars

Abstract

ABSTRACT:The purpose of this paper is an investigation of the possible role of supplementary cementitious materials (SCMs) on water transport kinetics and mechanical properties of hydrated lime (CL90) and Portland cement (PC) mortars. The properties of hydrated lime are significantly different from those of cement and therefore modifying fresh and hardened properties of these mortars are vital for mortar/substrate optimisation in masonry construction. The parameters investigated in this paper often are the main barriers to the use of hydrated lime in construction practice. The results show that transfer sorptivity and time to dewater freshly-mixed hydrated lime mortars can be modified when binder is partially replaced with SCMs. Compressive strength of CL90 mortars is increased systematically with the increased replacement levels of SCMs and the results are supported with the microstructural images. The ability to modify the water transport kinetics and mechanical properties allows compatibility between the mortar and the substrate unit in masonry construction. RESUMEN: Influencia de los materiales cementantes suplementarios sobre la cinética de transporte de agua y las propiedades mecánicas de cal hidratada y morteros de cemento.El objetivo de este artículo es investigar el papel de los materiales cementantes suplementarios (SCMs) en la cinética de transporte del agua y en las propiedades mecánicas de los morteros de cal hidratada (CL90) y cemento Portland. Las propiedades de la cal hidratada son significativamente diferentes a las del cemento y por lo tanto el control de las propiedades de los morteros frescos y endurecidos es fundamental en la optimización mortero/substrato en albañilería. Los parámetros estudiados en este trabajo son a menudo las principales barreras para el uso de la cal hidratada en la práctica de la construcción. Los resultados indican que la absortividad y el tiempo necesario para deshidratar morteros de cal hidratada recién mezclados pueden ser controlados cuando el conglomerante es parcialmente remplazado por SCMs. La resistencia a compresión de los morteros CL90 aumenta sistemáticamente con el nivel de sustitución de SCM. Las imágenes microestructurales realizadas, confirman estos resultados. La posibilidad de manipular la cinética de transporte de agua y las propiedades mecánicas permite la compatibilidad entre el mortero y la unidad de sustrato en albañilería.

Properties, durability and cost efficiency of cement and hydrated lime mortars reusing copper mine tailings of Lefke-Xeros in Cyprus

“…The use of copper tailings as a partial replacement have shown to significantly influence the transfer sorptivity as well as the water loss and hence the water:binder ratio of the resulting cement and lime mortars. The results are in a good agreement with previously published work [41,45,46,47]. The influence of the extent of transfer sorptivity and hence the degree of dewatering along with the changes in water:binder ratio on the mechanical properties and durability characteristics of these mortars are reported in the subsequent sections.…”

“…The study has shown that utilisation of the supplementary cementing materials manipulates the parameters of water transport kinetics of lime and cement mortars and further support the wet mortar/substrate optimisation to be developed in masonry construction. The ability to manipulate the water transport kinetics of mortars incorporating supplementary cementing materials and hence degree of dewatering has shown to have important consequences in the hardened state properties of these materials in Ince et al [45].…”

Effect of mix design on the size-independent fracture energy of normal- and high-strength self-compacting concrete

“…In every mixture, type II Portland cement produced by Portland Valderrivas cement factory (Seville, Spain) was used to prepare the concrete. A part of the cement was replaced by ground granulated blast furnace slag (ggbs) in normal-strength (NS) SCC or silica fume (SF) in case of high-strength (HS) SCC (16)(17)(18). Limestone powder with maximum particle size of 125 μm provided by Taljedy factory (Seville, Spain) was used as filler to increase plastic viscosity of the SCC.…”