Stabilization of NaCl-containing cuttings wastes in cement concrete by in situ formed mineral phases

Filippov, L.O.; Thomas, Fabien; Filippova, I.V.; Yvon, Jacques; Morillon-Jeanmaire, Anne

doi:10.1016/j.jhazmat.2009.06.065

Cited by 22 publications

(9 citation statements)

References 33 publications

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“…The leaching behaviour of the S/S monoliths was analysed according to NF X31-211, after 28 days of curing, since this was the method used at the industrial plant to determine the efficiency of the treatment. Results using this test have been little reported [56][57][58][59]. Fig.…”

Section: Assessment Of Leaching According To Nf X31-211mentioning

confidence: 91%

Stabilisation/solidification of APC residues from MSW incineration with hydraulic binders and chemical additives

Quina

Bordado²,

Quinta‐Ferreira

2014

Journal of Hazardous Materials

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This study focuses on the stabilisation/solidification (S/S) treatment of air pollution control (APC) residues from municipal solid waste (MSW) incineration. Six formulations (T1-T6) were tested based on different cements as binders, for the immobilisation of pollutants and to prevent their entering into the environment at unacceptable rates. Soluble phosphates and silicates were considered in some cases to fix heavy metals. The performance of T1-T6 products was measured in terms of initial and final setting times, mechanical strength, total availability and leaching from S/S products. Two monolithic leaching tests were used to estimate emissions of pollutants over 48h and 64 days. The results showed that the setting time was reduced when soluble phosphates were used. Moreover, although all the treatments have met the threshold of 1MPa for unconfined compressive strength, this parameter was significantly reduced due to matrix dissolution during immersion. After three cycles of leaching, the limit of 10% for solubilisation was exceeded for all treatments with the exception of T5 (with phosphates). This study demonstrated that the S/S treatment used at the industrial level can be improved with respect to toxic heavy metals, by using soluble silicates or phosphates, but not regarding soluble salts.

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Section: Assessment Of Leaching According To Nf X31-211mentioning

confidence: 91%

Stabilisation/solidification of APC residues from MSW incineration with hydraulic binders and chemical additives

Quina

Bordado²,

Quinta‐Ferreira

2014

Journal of Hazardous Materials

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“…Triplicate powdered CAC pastes ( m paste = 30 g) were immersed in CaCl 2 solutions ( V sol = 0.1 L) prepared across a range of concentrations [25]. CaCl 2 was selected to minimize the potential for cation-dependent alterations to the hydrated phase assemblages, and to provide sufficient Ca 2+ ions required for the formation of Friedel’s salt from hydrogarnet (C 3 AH 6 ) [29,64]. Following immersion of CAC pastes in CaCl 2 solutions, the free Cl − concentration ( C Cl,f ) in solution was measured at 7 d time-intervals over a 21 d period.…”

Section: Methodsmentioning

confidence: 99%

Anion capture and exchange by functional coatings: New routes to mitigate steel corrosion in concrete infrastructure

Falzone

Balonis

Bentz

et al. 2017

Cement and Concrete Research

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Chloride-induced corrosion is a major cause of degradation of reinforced concrete infrastructure. While the binding of chloride ions (Cl−) by cementitious phases is known to delay corrosion, this approach has not been systematically exploited as a mechanism to increase structural service life. Recently, Falzone et al. [Cement and Concrete Research 72, 54–68 (2015)] proposed calcium aluminate cement (CAC) formulations containing NO3-AFm to serve as anion exchange coatings that are capable of binding large quantities of Cl− ions, while simultaneously releasing corrosion-inhibiting NO3− species. To examine the viability of this concept, Cl− binding isotherms and ion-diffusion coefficients of a series of hydrated CAC formulations containing admixed Ca(NO3)2 (CN) are quantified. This data is input into a multi-species Nernst-Planck (NP) formulation, which is solved for a typical bridge-deck geometry using the finite element method (FEM). For exposure conditions corresponding to seawater, the results indicate that Cl− scavenging CAC coatings (i.e., top-layers) can significantly delay the time to corrosion (e.g., 5 ≤ df ≤ 10, where df is the steel corrosion initiation delay factor [unitless]) as compared to traditional OPC-based systems for the same cover thickness; as identified by thresholds of Cl−/OH− or Cl−/NO3− (molar) ratios in solution. The roles of hindered ionic diffusion, and the passivation of the reinforcing steel rendered by NO3− are also discussed.

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“…In contrast, aluminium phosphate is more efficient for the stabilization of water-based cuttings (Filippov et al, 2009). In contrast, aluminium phosphate is more efficient for the stabilization of water-based cuttings (Filippov et al, 2009).…”

Section: Discharge In Cementmentioning

confidence: 96%

“…These phases encapsulate the salt grains within a network, lowering its interaction with water or trapping the chloride (Filippov et al, 2009). Actually, apatite and hydrocalumite are formed.…”

Section: Discharge In Cementmentioning

confidence: 99%

Waste Disposal

Fink¹

2012

Petroleum Engineer's Guide to Oil Field Chemicals and Fluids

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Stabilization of NaCl-containing cuttings wastes in cement concrete by in situ formed mineral phases

Cited by 22 publications

References 33 publications

Stabilisation/solidification of APC residues from MSW incineration with hydraulic binders and chemical additives

Stabilisation/solidification of APC residues from MSW incineration with hydraulic binders and chemical additives

Anion capture and exchange by functional coatings: New routes to mitigate steel corrosion in concrete infrastructure

Waste Disposal

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