Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Shi, Caijun; Fernández-Jiménez, Ana

doi:10.1016/j.jhazmat.2006.05.008

Cited by 329 publications

(119 citation statements)

References 48 publications

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“…That is, the weight loss within the proposed temperature range in PC(P)_C10 sample indicated the decomposition of Ca(OH) 2 . In contrast, Ca(OH) 2 is not exist in AAS paste (Shi and Fernandez-Jimenez 2006). The CO 2 uptake in SS(P)_C10 and NS(P)_C10 samples in the proposed temperature range was approximately twice as high as that in PC(P)_C10 sample (see Table 8).…”

Section: Specimen Pc(p)_c0 Pc(p)_c10 Ns(p)_c0 Ns(p)_c10 Ss(p)_c0 Ss(pmentioning

confidence: 86%

“…It seems that a large amount of Cr in the test was immobilized in NS2 and SS2 specimens, since the C-S-H phases in AAS is a major reaction products. Shi and Fernandez-Jimenez reported that Pb in alkali activated cementitious material can be precipitated as Pb 3 SiO 5 , which is a highly insoluble silicate (Shi and Fernandez-Jimenez 2006). In the test, it seemed that Pb component in NS2 and SS2 be immobilized by the formation of Pb 3 SiO 5 .…”

Section: Heavy Metal Leaching Characteristics Of Carbonated Porous Comentioning

confidence: 92%

“…Vandecasteele et al reported that As can be reacted with Ca(OH) 2 in OPC paste to form the insoluble Ca 3 (AsO 4 ) (Vandecasteele et al 2002). In contrast, Ca(OH) 2 is not present in the AAS matrix (Shi and Fernandez-Jimenez 2006). Therefore, it can be inferred that As in PC2 specimen was immobilized ( % ) -3 1 3 0 2 0 3 9 3 2 2 4 3 2 5 3 3 3 5 2 3 4 2 3 7 2 9 3 3 10 29 28 18 36 32 by the formation of Ca 3 (AsO 4 ), whereas As in NS2 and SS2 specimens was washing off from the surface of them.…”

Section: Heavy Metal Leaching Characteristics Of Carbonated Porous Comentioning

confidence: 99%

“…The immobilization effectiveness of AAS paste has been reported in several studies, and details can be found in Shi and Fernandez-Jimenez (2006), Qian et al (2003aQian et al ( , 2003b. However, the microstructure and pH in AAS paste could be significantly affected by the carbonation process (Kar et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Kim

Jang

Naeem

et al. 2015

International Journal of Concrete Structures and Materials

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In the present study, a porous concrete with alkali activated slag (AAS) and coal bottom ash was developed and the effect of carbonation on the physical property, microstructural characteristic, and heavy metal leaching behavior of the porous concrete were investigated. Independent variables, such as the type of the alkali activator and binder, the amount of paste, and CO 2 concentration, were considered. The experimental test results showed that the measured void ratio and compressive strength of the carbonated porous concrete exceeded minimum level stated in ACI 522 for general porous concrete. A new quantitative TG analysis for evaluating CO 2 uptake in AAS was proposed, and the result showed that the CO 2 uptake in AAS paste was approximately twice as high as that in OPC paste. The leached concentrations of heavy metals from carbonated porous concrete were below the relevant environmental criteria.

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Section: Specimen Pc(p)_c0 Pc(p)_c10 Ns(p)_c0 Ns(p)_c10 Ss(p)_c0 Ss(pmentioning

confidence: 86%

Section: Heavy Metal Leaching Characteristics Of Carbonated Porous Comentioning

confidence: 92%

Section: Heavy Metal Leaching Characteristics Of Carbonated Porous Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Kim

Jang

Naeem

et al. 2015

International Journal of Concrete Structures and Materials

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“…Alkali-activated blast furnace slag cement is a typical example for the first group and alkali-activated metakaolin or fly ash cement for the second group [8], [9]. The kind of reaction product and their proportion should mainly influence special properties e.g.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Curing Conditions on the Properties of Geopolymer Samples

Arioz¹,

Arıöz²,

Koçkar³

2013

IJCEA

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Abstract-Geopolymers or inorganic polymers are getting increasing attention due to being environmentally friendly and having great potential for applications in various industries. Geopolymers have three dimensional amorphous structure and can be synthesized from by products such as fly ash, blast furnace slag or geological materials such as kaolinite.In this experimental study F class fly ash was used as a raw material and geopolymer samples were synthesized by means of sodium silicate and 8 M sodium hydroxide solutions. These samples were cured at 80°C for three different durations (6h, 15h and 24h). Compressive strength tests were carried out at 7 and 28 days. The maximum compressive strength was found to be 40.35 MPa. The compressive strength values indicated that the curing conditions influenced the physical properties of geopolymer samples. As the curing duration increased, the compressive strengths increased.XRD and FTIR techniques were used to characterize the fly-ash based geopolymers. In FTIR spectra it has seen that geopolymerisation has been achieved successfully. The major fingerprint for the geopolymer has obtained. It was also observed that there was no significant effect of curing conditions on the microstructure of the samples. FTIR and XRD spectrums were nearly the same with increasing duration.

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Cementitious Materials for Nuclear Waste Immobilization

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Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Cited by 329 publications

References 48 publications

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

Heavy Metal Leaching, CO2 Uptake and Mechanical Characteristics of Carbonated Porous Concrete with Alkali-Activated Slag and Bottom Ash

The Effect of Curing Conditions on the Properties of Geopolymer Samples

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