Ability of Two Dam Fine-Grained Sediments to be Used in Cement Industry as Raw Material for Clinker Production and as Pozzolanic Additional Constituent of Portland-Composite Cement

Abstract

other one is calcined in the range 550-1000 °C aiming to obtain a pozzolanic reactive material that could be used as supplementary cementitious material in blended Portland cement. After thermal treatments, the products are characterized and compared to ordinary Portland cement (OPC) and to pozzolanic active materials (fly ash from pulverized-coal power plant). Results showed that each sediment is suitable for the only tested reuse option. For the clinker prepared with SEP sediment, the morphology and the mineralogical composition correspond to those of a typical Portland clinker. Concerning calcined STA pozzolanic activity, the optimum thermal treatment was found to be 900 °C using the chemical Frattini test. Similar compressive strength results were obtained with calcined STA and silico-aluminous fly ash.Abstract Fine-grained sediment deposition is a phenomenon that occurs at different extents in all the reservoirs. This particle accumulation has to be properly managed, in accordance with the operational needs and the environment. As an extracted and on-land managed sediment has to be considered as a waste material according to both European and French regulations, sustainable reuse options need to be investigated. One of them could be a beneficial reuse as a raw material in cement industry either as partial substitution in Portland clinker raw mix or as a supplementary cementitious material (SCM) after thermal treatment in order to activate its possible pozzolanic activity. Two dredged materials, labelled SEP and STA, both from French hydroelectric reservoirs, are characterized on physical, chemical and mineralogical aspects. SEP is used as raw material partial replacement for clinker synthesis and the The original version of this article was revised due to a retrospective Open Access order.

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

“…The same finding was made in Diouri et al's study [17] which showed that using 8% of calcined sediment improves the hydration of the cement-sediment blend and results in mechanical strengths equivalent to those obtained with a CEM I Portland cement. Faure et al's study [18] confirmed this by observing portlandite consumption when calcined sediments were used. Calcined sediments also allow the improvement of the durability of concrete as shown in Safer et al's study [19] where part of the cement (10%, 20% and 30%) was substituted by sediment calcined at 750 °C for 5 hours.…”

Stabilization/solidification of sediments: challenges and novelties

“…Sand content is approximately close. From a given site's perspective, local hydrodynamics also may influence PSD of accumulated sediments, as in a reservoir where the inlet is enriched in coarse particles and the area near the dam is enriched with fine particles [17,18]. From Insert Table 1Table 1, we observe that continental sediments tend to a higher total organic carbon (TOC) content, with a mean content of 4.21 wt.% versus 2.60 wt.% for marine sediments, and a median of 3.40 vs 2.50 wt.%.…”

The Pozzolanic Activity of the Sediment Treated by the Flash Calcination Method

“…This is due to the elimination of organic matter (density 1 g/cm 3 ) and the decomposition of limestone (density 2.6-2.8 g/m 3 ) to form calcium oxide (density approximately 3.3 g/cm 3 ). However, a decrease in the density of SF 800 upon increasing the calcination temperature could be due to the recrystallization of the mineral phases [44]. The flash calcination also induces a slight increase in particle size without a reduction in specific surfaces.…”