Study of the pozzolanic activity of a dredged sediment from Dunkirk harbour

Amar, Mouhamadou; Benzerzour, M.; Abriak, N.‐E.; Mamindy-Pajany, Yannick

doi:10.1016/j.powtec.2017.07.055

Cited by 39 publications

(35 citation statements)

References 39 publications

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“…The increase of strength is linked to the physical and chemical activity of flash calcined sediments. This activity has already been the subject of several works in the literature [13,15,20,24,50].…”

Section: Experimental Design and Mixture Modelmentioning

confidence: 94%

“…The treatment of sediments is a necessary step to optimize their use as SCMs in a cementitious matrix. The grinding allows obtaining fine sediment particles, to enhance their specific surface area and thus their reactivity [13,23]. The pozzolanic potential of sediments also depends on the calcination conditions (temperature and duration) as the mineral phases in sediments and especially clayey phases are activated during this step [29][30][31].…”

Section: Sediment Treatment: Grinding and Flash Calcinationmentioning

confidence: 99%

“…However, FCS shows a finer granulometry with D50 = 5.75 µm, which is about two times less than OPC. This modification of fineness can be explained by the densification of the grains of the sediment during the heat treatment process [13]. In addition, a change into a more rounded shape of the sediments' particles is likely to occur due to the cyclonic air movement in the flash calcination unit [30] [38].…”

Section: Materials Propertiesmentioning

confidence: 99%

“…(1) kaolinite metakaolinite Pozzolanic activity of calcined sediments was demonstrated in many works in the literature [9,[12][13][14][15]. The study of Dang et al [16] on composite cements based on Portland cement and marine sediment from Brittany, France, showed that the blended cement based on sediment calcined at 650 °C involved higher compressive strengths than the one based on classical calcareous filler.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Ternary Binders Based on Flash-Calcined Sediments and Ground Granulated Blast Furnace slag Using a Mixture Design

Zeraoui¹,

Maherzi²,

Benzerzour³

et al. 2021

Preprint

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CO2 emissions resulting from the production of cement is a major issue, but can be limited by the partial substitution of cement by low-carbon-impact additions. The aim of this study was the formulation of a ternary binder based on ordinary Portland cement (OPC), ground granulated blast-furnace slag (GGBS) and flash-calcined sediment (FCS), a dredged waste which was valorized after applying a new heat treatment: flash calcination. The used materials were physically, chemically and mineralogically characterized. The composition of the formulations was optimized using mixture designs. Five formulations, one reference formulation RM (100% OPC), one binary formulation (50% OPC/50% GGBS), and three ternary formulations with a variable FCS rate (10%, 15%, 20%), were selected and characterized fresh and hardened. Results showed that the incorporation of FCS reduced the workability and increased the density. In addition, a decrease in the initial setting time and the heat of hydration peak were observed. In the hardened state, the formulation containing 10% FCS showed 90-day mechanical strengths superior to that of RM. The use of FCS in ternary binders could reduce the environmental impact by reducing greenhouse gas emissions.

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Section: Experimental Design and Mixture Modelmentioning

confidence: 94%

Section: Sediment Treatment: Grinding and Flash Calcinationmentioning

confidence: 99%

Section: Materials Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of Ternary Binders Based on Flash-Calcined Sediments and Ground Granulated Blast Furnace slag Using a Mixture Design

Zeraoui¹,

Maherzi²,

Benzerzour³

et al. 2021

Preprint

Self Cite

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“…In view of all the results obtained (comparison between performances and energetic cost), the B2 fines would present the best compromise in accordance with the results. Of course, other parameters should be taken into account (transport, resources,...) for an accurate evaluation of environmental impact and life cycle analysis [40,41].…”

Section: Environmental Considerationsmentioning

confidence: 99%

Alternative hydraulic binder development based on brick fines: Influence of particle size and substitution rate

Grellier

Bulteel

Bouarroudj

et al. 2021

Journal of Building Engineering

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Brick waste is produced in large quantities by the civil engineering sector without any real valorization. One way of valorizing this material consists in incorporating brick fines in cement. The substitution of clinker with this material produces an alternative hydraulic binder. In addition to the reduction in cost and energy saving, blended cement based on brick fines would present the advantage to improve the environmental impact of cement production by reducing its CO2 emission. Therefore, the aim of this paper is to study the use of bricks fines in cement, focusing more specifically on the impact of the size of their particles on fresh and hardened cement paste properties. Potential pozzolanic activity of the three brick fines was investigated as well as its influence on the microstructure and strength of cement paste samples.The results showed that it was possible to produce blended cement based on brick fines.Substitution rates up to 20% with brick fines whose dimensions are close to those of clinker gave good performances compared to the reference cement. The brick fines clearly impact the hydration process through nucleation action and pozzolanic activity.

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