Eco-trench: a novel trench solution based on reusing excavated material and a finishing layer of expansive concrete
Ana Blanco-Alvarez
Pablo Pujadas
C. Fernandez
Sergio Pialarissi-Cavalaro
Antonio Aguado
2134/32307
https://repository.lboro.ac.uk/articles/journal_contribution/Eco-trench_a_novel_trench_solution_based_on_reusing_excavated_material_and_a_finishing_layer_of_expansive_concrete/9440300
Installing utility pipelines generates a significant amount of trench arisings, which are usually transported to landfills instead of being reused as backfill material. This practice generates CO 2 emissions and wastes raw materials. This paper presents a more sustainable solution, an eco-trench, which is based on re-using trench arisings as backfill and adding a top layer of expansive concrete to improve the eco-trench's structural performance. The technical feasibility of the eco-trench was evaluated through a finite element model, which identified the degree of expansion in concrete required to avoid failure or subside the stresses caused by traffic. The potential expansion of concrete was measured under confined conditions in the laboratory by means of a novel test developed for this purpose. The results showed that adding calcium oxide generates the required internal stress. The results were then confirmed in a pilot experience.
2018-03-20 16:59:36
Concrete
Mixture proportion
Expansion
Finite element method
Shrinkage
Built Environment and Design not elsewhere classified