Authors: Diba Ahadzadeh Ghanad, Ahmed Soliman, Stephane Godbout, Joahnn Palacios
Download file: https://library.csbe-scgab.ca/docs/meetings/2021/CSBE21450.pdf
Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » 9th Concrete for sustainable agriculture International Symposium
The life-cycle of any concrete structure depends on its type, the used material, the exposure and operation conditions, as well as other factors. Consequently, various modes and mechanisms of concrete deteriorations can be detected, such as shrinkage cracking, loss of bond and spalling. Among these causes of structural degradation, bio-deterioration is a common mechanism in agriculture concrete structures such as agricultural effluents collecting, storage and treatment structures. Organic acids, ammonium, and gases are generated as a result of microorganisms' activities, lead to a very aggressive environment for the cementitious materials. On the other hand, the use of biomass and agricultural residues in the concrete could lead to both, reduce footprint of concrete structure and contribute to a circular economy model. Hence, this study investigates the performance of agro-concrete mixtures exposed to a simulated aggressive agriculture environment. Various agriculture biomass were added as a partial replacement of natural aggregate at rates 10%, 15%, and 20% by volume. Residual strength, mass loss and ultrasonic pulse velocity tests were conducted to evaluate agro-concrete degradation over the investigated period. Results showed that increasing the agriculture biomass content affected the performance. However, finding the optimum content of such residuals increases the potential of their use to achieve sustainable agro-concrete with adequate performance.