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• W4200617691 abstract "The preservation of natural resources and the limitation of CO2 emissions contribute to sustainable development. In the context of concrete design, this contribution is achieved by using local or recycled aggregates. However, such aggregates can be porous and of low quality, adversely affecting the compressive strength and the durability of concrete. To gain a preliminary understanding, an experimental programme was designed for an elementary model (EM) composed of paste and gravel. This paper analyses the impact of the nature (highly or only slightly porous), the moisture state (saturated surface dry (SSD) or oven dry (OD)) and the volume content of aggregates, together with the binder nature, on i) the water porosity of the EM (WP EM), and ii) the structure of the paste-aggregate interface. The results indicate that volume and water porosity of the aggregate are the two most important factors affecting WP EM. In order to better highlight the coupling between the nature of the aggregate and the nature of the binder, the porosity of the paste in the EM (WP PEM) is calculated. This calculation shows that it is the nature of the binder (water retention capacity and reactivity) rather than the aggregate porosity that mainly controls the variations of WP PEM, in comparison with the porosity of the paste hydrated (WP BP) without any aggregates. The representation of the difference between WP PEM and WP BP by a three-phase model makes it possible to assess the extent of the aggregate disturbance in the arrangement of hydration products (physical thickness of the interfacial transition zone (ITZ)). In most cases this is greater than the chemical disturbance measured with a scanning electron microscope (SEM) in combination with energy-dispersive spectroscopy (EDS). The increase in the aggregate volume content accentuates WP PEM and the ITZ physical thickness when porous aggregates (natural or recycled) in the SSD moisture state are inserted." @default.
• W4200617691 created "2021-12-31" @default.
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• W4200617691 date "2022-02-01" @default.
• W4200617691 modified "2023-10-14" @default.
• W4200617691 title "Impact of the porosity and moisture state of coarse aggregates, and binder nature on the structure of the paste-aggregate interface: Elementary model study" @default.
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• W4200617691 doi "https://doi.org/10.1016/j.conbuildmat.2021.126112" @default.
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