Sustainable reuse of sediments in bio-based materials -Application to fluvial sediments with incorporation of natural fibers
Réutilisation durable des sédiments dans des matériaux biosourcés - Application aux sédiments fluviaux avec incorporation de fibres naturelles
Résumé
This research is focused on sediment reuse in fired bricks, earth bricks and agronomy in the context of the circular economy. Usumacinta River sediments are dredged from Tabasco state of Mexico. Characteristics of these sediments were investigated for their reuse. Sediment suitability for bricks was observed with industrial approaches and standards. Fired bricks were manufactured with sediments mixing, moulding, drying and firing. Cubic (20*20*20 mm3) and prismatic (15*15*60 mm3) brick specimens were made for compressive and tensile strength test of fired bricks. Bricks were fired at a temperature range of 700 °C to 1100°C to optimize
the use of energy. Strength of bricks was also optimized with different moulding moisture contents. Scale effect on strength of bricks was observed by varying the dimensions of fired bricks.
Similarly, earth bricks were manufactured by using Usumacinta River sediments (J3) and palm fibers which are local agro-industry waste. Characteristics of palm oil fibers such as morphology, tensile strength, biochemical composition etc. were investigated for their reuse in earth bricks. Palm oil flower fibers were used to make earth bricks due to their suitable morphology and strength. These fibers were extracted with a knife mill by using grids of 2cm (G-2cm) and 3cm (G-3cm). Earth bricks were manufactured with 0%, 1%, 2%, 3%, 4% and 5% fiber addition by mass and compacted dynamically. Earth bricks were dried in oven at 40°C. Tensile and compressive strength tests were performed on bricks to observe the influence of fiber addition. Brick's durability was also assessed with inundation, water absorption and abrasion test.
For Usumacinta River sediments use in agronomy, their agronomic characteristics such as presence of nutrients, pH, electrical conductivity and sodium absorption ratio were investigated. Experimental study was conducted in greenhouse to observe the growth of ryegrass with Usumacinta sediments and potting soil. Three soil compositions with 0% sediments, 50% sediments+50% potting soil and 100% sediments were used. Growth and germination of ryegrass were observed in different soil compositions to assess the agronomic potential of sediments.
Furthermore, the findings of Usumacinta sediments were replicated for local French sediments from Dunkirk port and Garonne River to make earth bricks with hemp shiv as reinforcement.
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Domaines
Physique [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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