New experimental approach of the reuse of dredged sediments in a cement matrix by physical and heat treatment

Benzerzour, M.; Amar, Mouhamadou; Abriak, N.‐E.

doi:10.1016/j.conbuildmat.2017.02.142

Cited by 75 publications

(54 citation statements)

References 49 publications

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“…These studies have demonstrated that the high organic matter content causes a major problem in cementitious materials by delaying the initial setting, resulting in the decrease of the mechanical strength of mortars or concrete. This favors the valorization of Sidi Mansour and Sidi Youssef sediments in the construction sector (Benzerzour et al, 2017; Rozière et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

An eco-friendly epoxy polymer binder for the treatment of Tunisian harbor sediments: Laboratory investigations for beneficial reuse

et al. 2020

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The management of dredged sediments poses serious environmental and economic problems because of their geochemical properties and in particular their pollutant content. In this research, marine sediments from Tunisian harbors were collected to study their beneficial reuse as construction materials using an eco-friendly polymer binder. Experimental investigations include the determination of physicochemical, mineralogical, and environmental parameters of sediments from the Sidi Mansour and Sidi Youssef areas in Tunisia. Prismatic mortar samples (4 × 4 × 16 cm) were prepared at laboratory scale using normalized sand and epoxy resin. Then their composition was modified by including a sediment fraction in the substitution of sand at rates ranging from 10 to 50% in dry mass. After a 7-day curing period, mortar samples were submitted to mechanical, physicochemical, and environmental analyses. Mortar samples including sediment fractions displayed lower strength than sand mortar used as control. This result is explained by the increase of porosity values in the mortar samples when sediment samples were incorporated. A positive relationship between porosity and compressive strength values was evidenced, suggesting that the compactness of granular skeleton could play an important role in the preparation of materials. From an environmental point of view, the mortar samples containing sediment fractions showed relatively low leaching levels, which confirms their suitability for the manufacturing of construction materials.

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Section: Resultsmentioning

confidence: 99%

An eco-friendly epoxy polymer binder for the treatment of Tunisian harbor sediments: Laboratory investigations for beneficial reuse

et al. 2020

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“…Deposition of sediment on the bottoms of water bodies is either a natural process (so-called endogenous origin) or frequently is due to human activity (so-called exogenous origin). As a result of these processes, large amounts of sediments with different grain size and chemical composition are extracted [2][3][4]. In France, for example, the amount of extracted sediments reaches 50 million m 3 per year.…”

Section: Introductionmentioning

confidence: 99%

“…As a result of these processes, large amounts of sediments with different grain size and chemical composition are extracted [2][3][4]. In France, for example, the amount of extracted sediments reaches 50 million m 3 per year. For the same time period, 300 million m 3 of sediment is extracted in Europe and the USA [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…In France, for example, the amount of extracted sediments reaches 50 million m 3 per year. For the same time period, 300 million m 3 of sediment is extracted in Europe and the USA [2,3]. Currently, there is not much guidance on how to manage the waste from dredging.…”

Section: Introductionmentioning

confidence: 99%

“…The literature extensively describes the manner of utilization of bottom sediments in building materials. They are used as additives to cements [12][13][14] mortars [3,4,15] as well as concrete [16][17][18][19]. These deposits are also used in ceramic materials, such as bricks [20,21] and lightweight aggregate [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the amount of river sediment on the basic properties of cement mortars

2020

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According to current legal regulations, bottom sediment in watercourses containing heavy metals are considered dangerous to the environment and should be properly managed after extraction. Due to the well-known excellent ability of the products of cement hydration to immobilize heavy metals, the possibility of utilizing this type of waste products in cement composites was preliminary tested. For this purpose, basic research was carried out on the technological and mechanical characteristics of binders containing sediment from one of the rivers located in Lesser Poland. Standard mortars made of Portland cement CEM I and river sediment dried at 105°C were used for the tests. This supplement replaced cement in the amount of 10%, 20%, 30% and 40% by weight. The technological properties such as: water demand, setting time, consistency and mechanical properties were verified. Compressive and tensile strength at bending of hardened mortars were tested at different curing periods, i.e. after 14, 28 and 90 days. The obtained test results confirm that the fraction of river sediment in the binder in the amount of 10% generally does not adversely affect the properties of mortars, however, its greater amount is reflected in changes in the technological features and in a clear reduction of mechanical properties of the tested mortars.

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Plane‐strain model for large strain consolidation induced by vacuum‐assisted prefabricated horizontal drains

Song

Yin

et al. 2023

Num Anal Meth Geomechanics

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Vacuum-assisted prefabricated horizontal drain (PHD) can be used to accelerate the consolidation process of dredged mud slurry with high water content, and this method exhibits advantages over traditional treatment methods that use prefabricated vertical drain (PVD). However, large-strain model that can simulate soil consolidation induced by vacuum-assisted PHDs is missing in the literature, although the large-strain models for PVD-induced radial consolidation are abundant. This study presents a piecewise-linear plane-strain model for large-strain consolidation induced by vacuum-assisted prefabricated horizontal drains. The model is called PCS, abbreviation for Plane-strain Consolidation Settlement. PCS model can account for complex conditions including large strain, multiple layers of PHD boards, staged filling of soil layers, varying spacing of PHD boards, time-dependent surcharge and/or vacuum loading, soil self-weight, nonlinear compressibility, and hydraulic conductivity during the consolidation process, vertical and horizontal flows, and non-Darcian flow. The PCS is validated using the two-dimensional Terzaghi's consolidation theory (small strain) and a largescale laboratory model test (large strain), which involves multiple soil layers filled in stages, multiple PHD layers, and different horizontal spacings of PHD boards. Lastly, the proposed model is applied to a case study conducted at Shimokita Peninsula (Aomori Prefecture, Japan), where vacuum-assisted PHDs have been used to treat the dredged mud slurry for a duration of 330 days.

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New experimental approach of the reuse of dredged sediments in a cement matrix by physical and heat treatment

Cited by 75 publications

References 49 publications

An eco-friendly epoxy polymer binder for the treatment of Tunisian harbor sediments: Laboratory investigations for beneficial reuse

An eco-friendly epoxy polymer binder for the treatment of Tunisian harbor sediments: Laboratory investigations for beneficial reuse

Effect of the amount of river sediment on the basic properties of cement mortars

Plane‐strain model for large strain consolidation induced by vacuum‐assisted prefabricated horizontal drains

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