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164 results on '"Menéndez, Esperanza"'

151. Assessment of Damage and Expansion

Author

Esperanza Menéndez, Andreas Leemann, L.F.M. Sanchez, Menéndez, Esperanza [0000-0001-6461-4798], and Menéndez, Esperanza

Subjects
Materials science, Index (economics), Composite material
Abstract

An indication about the expansion of the concrete can be derived from the crack-index [1]. The crack-index is determined by measuring the crack width along pre-drawn lines, Fig. 2.1 and is expressed as crack-width per measured length. However, it has to be kept in mind that the formation of the cracks may not be attributable solely to AAR. Still, the crack index indicates a concrete expansion at the studied location in mm/m.

Published
2020
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164. Carbonation Resistance of Ternary Portland Cements Made with Silica Fume and Limestone.

Author

Sanjuán MÁ, Menéndez E, and Recino H

Abstract

Ternary blended cements, made with silica fume and limestone, provide significant benefits such as improved compressive strength, chloride penetration resistance, sulfates attack, etc. Furthermore, they could be considered low-carbon cements, and they contribute to reducing the depletion of natural resources in reference to water usage, fossil fuel consumption, and mining. Limestone (10%, 15%, and 20%) with different fineness and coarse silica fume (3%, 5%, and 7%) was used to produce ternary cements. The average size of coarse silica fume used was 238 μm. For the first time, the carbonation resistance of ternary Portland cements made with silica fume and limestone has been assessed. The carbonation resistance was assessed by natural carbonation testing. The presence of coarse silica fume and limestone in the blended cement led to pore refinement of the cement-based materials by the filling effect and the C-S-H gel formation. Accordingly, the carbonation resistance of these new ternary cements was less poor than expected for blended cements.

Published
2024
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