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29-04-2024 | REGIONAL CASE STUDY

Case study: reuse of excavated soils from the Grand Paris Express project for the formulation of low-carbon cementitious matrixes : Part 1

Authors: Mouhamadou Amar, Joelle Kleib, Mouhamadou Tall, Ali Alloul, Ahmed Zeraoui, Nor-edine Abriak, Mahfoud Benzerzour

Published in: Journal of Material Cycles and Waste Management

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Abstract

This paper investigates the use of excavated soil from the Grand Paris Express (GPE) project in blended low-carbon binders. The GPE targets to improve the quality of life of the inhabitants of the Paris metropolitan area by providing better transportation, housing, and job opportunities. However, the quantity of excavated material since the start of the GPE project is around 28 million tons (Mt) and will reach 47 Mt by 2027 (Bilan des émissions de gaz à effet de serre de la Société du Grand Paris et du Grand Paris Express, 2022). Soil samples were taken from 4 sites of the GPE project and analyzed for their physical, chemical, and mineralogical characteristics. Results have evidenced that using flash-calcination (FC) treatment can sensitively enhance material properties. Pozzolanic activity of both raw and treated materials, assessed by Chapelle and Frattini tests showed that flash-calcined excavated soils have a chemical reactivity. Mortars formulated with blended cement produced with the FC materials were mechanically tested and disclosed interesting performances. The evaluation of the environmental impact consisting of leaching tests demonstrated that the treated material can be considered as inert as well as the mortars prepared. These findings indicate soils from the GPE project are suitable for reuse in cementitious matrixes and have the potential to provide economic and environmental benefits.

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Metadata
Title
Case study: reuse of excavated soils from the Grand Paris Express project for the formulation of low-carbon cementitious matrixes : Part 1
Authors
Mouhamadou Amar
Joelle Kleib
Mouhamadou Tall
Ali Alloul
Ahmed Zeraoui
Nor-edine Abriak
Mahfoud Benzerzour
Publication date
29-04-2024
Publisher
Springer Japan
Published in
Journal of Material Cycles and Waste Management
Print ISSN: 1438-4957
Electronic ISSN: 1611-8227
DOI
https://doi.org/10.1007/s10163-024-01957-z