The efficacy of pH-dependent leaching tests to provide a reasonable estimate of post-carbonation leaching

Ai, Haiping; Clavier, Kyle A.; Watts, Benjamin E.; Gale, S. Adrian; Townsend, Timothy G.

doi:10.1016/j.jhazmat.2019.03.089

Cited by 33 publications

(4 citation statements)

References 36 publications

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“…Contrastively, metal leaching under a strongly acidic environment is highly correlated to their intrinsic concentration levels, which appeared to be significantly different among various IBA samples (Ai et al, 2019). Due to seawater buffering, there was a shift of pHs for the IBA leachates from a more alkaline pH range of 11.0-12.5 as identified with DI water (Yin et al, 2017) to a lesser one of 8.2-11.4, and meanwhile their metal leaching concentrations were well agreed with the corresponding concentrations determined by the pH-static leaching tests at the same pH range, as indicated by the window zone in Fig.…”

Section: Iba Leachabilitymentioning

confidence: 87%

Human exposure and risk assessment of recycling incineration bottom ash for land reclamation: A showcase coupling studies of leachability, transport modeling and bioaccumulation

Yin

Chan

Dou

et al. 2020

Journal of Hazardous Materials

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Section: Iba Leachabilitymentioning

confidence: 87%

Human exposure and risk assessment of recycling incineration bottom ash for land reclamation: A showcase coupling studies of leachability, transport modeling and bioaccumulation

Yin

Chan

Dou

et al. 2020

Journal of Hazardous Materials

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“…14 and 15 indicate the compressive strengths measured for the double experiments for higher and lower water ratio and binder content, which explains the large disparity in some cases, e.g. (5,25), (1,9). Here the combinations that did not show an increase in the compressive strength is caused by a too low pH to activate slag (Fig.…”

Section: Leaching Of Tbt With Addition Of Ckdmentioning

confidence: 90%

Evaluation of Different Binder Combinations of Cement, Slag and CKD for S/S Treatment of TBT Contaminated Sediments

Lindh

Lemenkova

2021

Acta Mechanica Et Automatica

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The seabed in the ports needs to be regularly cleaned from the marine sediments for safe navigation. Sediments contaminated by tributyltin (TBT) are environmentally harmful and require treatment before recycling. Treatment methods include leaching, stabilisation and solidification to remove toxic chemicals from the sediments and improve their strength for reuse in the construction works. This study evaluated the effects of adding three different binder components (cement, cement kiln dust (CKD) and slag) to treat sediment samples collected in the port of Gothenburg. The goal of this study is to assess the leaching of TBT from the dredged marine sediments contaminated by TBT. The various methods employed for the treatment of sediments include the application of varied ratios of binders. The project has been performed by the Swedish Geotechnical Institute (SGI) on behalf of the Cementa (HeidelbergCement Group) and Cowi Consulting Group, within the framework of the Arendal project. An experiment has been designed to evaluate the effects of adding CKD while reducing cement and slag for sediment treatment. Methods that have been adopted include laboratory processing of samples for leaching using different binder combinations, followed by statistical data processing and graphical plotting. The results of the experiment on leaching of TBT for all samples are tested with a varied ratio of cement, slag, CKD and water. Specimens with added binders ‘cement/CKD’ have demonstrated higher leaching compared to the ratio ‘cement/slag/CKD’ and ‘cement/slag’. The ‘CKD/slag’ ratio has presented the best results followed by the ‘cement/slag/CKD’, and can be used as an effective method of s/s treatment of the sediments. The results have shown that the replacement of cement and slag by CKD is effective at TBT leaching for the treatment of toxic marine sediments contaminated by TBT.

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“…The apparent pH values of the samples retrieved from different depths of the four different pastes (C, C-SF, C-GGBS, and C-MK; see Table 2) were measured after curing with or without UV radiation for 7, 14, 28, and 56 d, using the method described in Section 2.3, and the pH variation trend is shown in Figure 6. The apparent pH can effectively reflect the change in the degree of carbonation because the carbonation reaction consumes portlandite and other alkaline hydration products, causing a decrease in the alkalinity of the pore solution [25,26].…”

Section: Change In the Ph Of Cement-based Materials During Their Curingmentioning

confidence: 99%

Effects of UV Radiation on the Carbonation of Cement-Based Materials with Supplementary Cementitious Materials

Shui

Wang

et al. 2023

Coatings

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Solar light with high-energy ultraviolet (UV) radiation acting on the surface of cement-based materials easily changes the properties of cement-based materials by affecting their carbonation reaction. In order to elucidate the difference in the carbonation process under UV radiation in cement-based materials with different supplementary cementitious materials (SCMs), the carbonation depth (apparent pH values), chemical composition (XRD, FTIR, and TG analysis), and mechanical properties (compressive strength and microhardness) of cement-based materials were evaluated. The results revealed that UV radiation acting on the surface of cement-based materials accelerated the carbonation reaction, which enhanced the decrease rate of pH and formation of stable calcite, thereby improving the macromechanical and micromechanical properties of cement-based materials. In addition, the carbonation process under UV radiation differs according to the added SCM. In particular, silica fume substantially increased the carbonation of cement-based materials under UV radiation, resulting in a 53.3% increase in calcium carbonate coverage, a 10.0% increase in compressive strength, and a 20.9% increase in mean microhardness, whereas the incorporation of blast furnace slag resulted in a smaller effect on UV irradiation-induced carbonation. In addition, UV radiation facilitates the crystallographic transformation process of cement-based materials containing metakaolin, resulting in more stable crystals of carbonation products. This study provides a theoretical framework and serves as an important reference for the design of cement-based materials under strong UV radiation for practical engineering applications.

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The efficacy of pH-dependent leaching tests to provide a reasonable estimate of post-carbonation leaching

Cited by 33 publications

References 36 publications

Human exposure and risk assessment of recycling incineration bottom ash for land reclamation: A showcase coupling studies of leachability, transport modeling and bioaccumulation

Human exposure and risk assessment of recycling incineration bottom ash for land reclamation: A showcase coupling studies of leachability, transport modeling and bioaccumulation

Evaluation of Different Binder Combinations of Cement, Slag and CKD for S/S Treatment of TBT Contaminated Sediments

Effects of UV Radiation on the Carbonation of Cement-Based Materials with Supplementary Cementitious Materials

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