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Activated sugarcane bagasse ash as efficient admixture in cement-based mortars: Mechanical and durability improvements

Torres de Sande, V, Sadique, M, Brás, A and Pineda, P (2022) Activated sugarcane bagasse ash as efficient admixture in cement-based mortars: Mechanical and durability improvements. Journal of Building Engineering, 59. ISSN 2352-7102

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Open Access URL: https://doi.org/10.1016/j.jobe.2022.105082 (Published version)


Biomass ashes can be used in cementitious materials as cement or sand substitution. Nevertheless, ashes resulted from the combustion of biomass in generation plants present drawbacks that can reduce their potential use if they are not previously treated. In this research, industrial sugarcane bagasse ash (SCBA) was mechanically activated by grinding and its effects evaluated when used as mineral admixture in cementitious materials. Four different substitution rates (0%, 10%, 20% and 30%) where used to investigate the influence of the amount of ashes replaced on the durability and mechanical performance of mortars and identify the optimal substitution rate. To get a thorough comprehension, results were also compared to mortars containing untreated ashes. The combination of a performance-based testing campaign (compressive and flexural strength, open porosity, apparent density, water capillary absorption, surface electrical resistivity, rapid chloride migration coefficient) and a set of analytical techniques (XRD, FT-IR, SEM and TGA-DTA) enabled to characterise the mechanical and durability properties of mortars and identify the mechanisms behind the results. The research concluded that, at 28 days, the incorporation of ground SCBA enhances the compressive strength of mortars up to 62%, decreases the porosity of samples by 35%, highly improves the resistance to the diffusion of chlorides by 10 times and improve the interfacial transition zone by narrowing and closing the gap between aggregates and pastes.

Item Type: Article
Uncontrolled Keywords: 0905 Civil Engineering; 1201 Architecture; 1202 Building
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Divisions: Civil Engineering & Built Environment
Publisher: Elsevier BV
SWORD Depositor: A Symplectic
Date Deposited: 07 Nov 2022 11:19
Last Modified: 07 Nov 2022 11:30
DOI or ID number: 10.1016/j.jobe.2022.105082
URI: https://researchonline.ljmu.ac.uk/id/eprint/18036
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