Impact of aggregates on fresh mortars’ properties

Author(s): Ana Rita Santos, Maria do Rosário Veiga, António Santos Silva, Jorge de Brito
Paper category: Proceedings
Book title: Proceedings of the 5th Historic Mortars Conference
Editor(s): José Ignacio Álvarez, José María Fernández, Íńigo Navarro, Adrián Durán, Rafael Sirera
ISBN: 978-2-35158-221-3
e-ISBN: 978-2-35158-222-0
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 1180-1194
Total Pages: 15
Language : English

Abstract: The workability of a mortar largely depends on its water content, water retentivity and internal friction of the particles. Since these properties are closely related to properties such as porosity, size, shape and amount of aggregate, and type and amount of binder, it is expected that the use of different aggregates changes the water/binder (w/b) ratio in order to keep the target flow consistency.
In order to evaluate the influence of aggregates’ mineralogy, shape and grain size distribution on fresh mortars’ properties (such as workability, flow ability, water content and water retentivity), several mixes were prepared using three different binders, five aggregates of different mineralogy and two size distribution curves. The results indicate that, in general, a greater specific surface area (SSA) of the mix constituents will increase the amount of water required to lubricate the surface of the particles and will also enhance the water retentivity. However, a large SSA can be obtained for a significant range of fine grains, which leads to an optimization of the packing density of solid materials, thus offsetting the effect of the SSA through their own lubricating mechanism.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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