Rheological behaviour of hydraulic lime-based mortars


The rheological behaviour of fresh mortars is a key characteristic since it determines the material workability, having as well a great influence on the hardened product final characteristics. In this work, the rheological properties of fresh hydraulic lime-based mortars were investigated. The mortar rheological parameters, relative yield stress (g) and relative plastic viscosity (h), were obtained using a specific rheometer for mortars. In addition, the correlation of rheological data with slump measurements performed in the same samples was also attempted. The workability of fresh mortars is affected by several parameters, namely, binder/aggregate ratio, kneading water content, type and amount of admixtures. Chemical admixtures studied included a superplasticizer, an air-entraining agent and a water-retaining agent. The influence of these parameters on the rheological behaviour of hydraulic lime-based mortars is detailed. (c) 2006 Elsevier Ltd. All rights reserved.




Materials Science


Seabra, MP; Labrincha, JA; Ferreira, VM

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