The effects of simulated environmental attack on immobilization of heavy metals doped in cement-based materials

Bonen, David; Sarkar, S.

doi:10.1016/0304-3894(94)00091-t

Cited by 67 publications

(37 citation statements)

References 15 publications

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“…Cd forms carbonates and hydroxicarbonates [5,10,40]. Ni and Co can replace Ca in calcium silicate hydrate [5,10], although some authors have reported positive results for Ni, due to the presence of part of the metals as carbonates [38].…”

Section: Mnmentioning

confidence: 95%

“…In hydrated systems, they are moderately mobilised due to the lowering of the pH, although their concentration in the leachates is below the regulation limits [5,10]. These metals form either hydroxi-carbonates or carbonates that deposit on the calcium silicate minerals [1,10].…”

Section: Cumentioning

confidence: 97%

“…These metals form either hydroxi-carbonates or carbonates that deposit on the calcium silicate minerals [1,10]. In comparison with other metals, they are the best retained species.…”

Section: Cumentioning

confidence: 98%

“…Some metals, such as Pb, Cd, Ni, can cause an increase in permeability and pore size distribution, causing a decrease of the alkaline buffering capacity of the cementitious solid, a degree of decalcification of the anhydrous calcium silicate phases and an acceleration of hydration. Experimental studies have shown that the amount of calcium carbonate deposited in carbonated metal-doped solid can be up to 40% higher than in samples that have not been doped [10].…”

Section: Reactivity Of Comentioning

confidence: 99%

“…As acid attack proceeds, a considerable amount of dissolution of primary cementitious phases and the precipitation of secondary phases results. The main secondary mineral, CaCO 3 , is formed by the combination of moist CO 2 with Ca 2+ , is mobilised via the dissolution of calcium hydroxide (portlandite), and from the decalcification of the gel phase, C-S-H 1 [10] to leave silicate hydrate.…”

Section: Natural Carbonationmentioning

confidence: 99%

See 4 more Smart Citations

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

Bertos

Simons

Hills

et al. 2004

Journal of Hazardous Materials

776

207

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Section: Mnmentioning

confidence: 95%

Section: Cumentioning

confidence: 97%

“…These metals form either hydroxi-carbonates or carbonates that deposit on the calcium silicate minerals [1,10]. In comparison with other metals, they are the best retained species.…”

Section: Cumentioning

confidence: 98%

Section: Reactivity Of Comentioning

confidence: 99%

Section: Natural Carbonationmentioning

confidence: 99%

See 3 more Smart Citations

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

Bertos

Simons

Hills

et al. 2004

Journal of Hazardous Materials

776

207

View full text Add to dashboard Cite

Effects of pH on leaching behavior of compacted cement solidified/stabilized lead contaminated soil

Wang

Xue

et al. 2015

Env Prog and Sustain Energy

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The compacted cement stabilized/solidified (S/S) metal contaminated soil could be used for “controlled utilization,” such as road base, quarry rehabilitation, and lagoon closure. However, the complexity and variability of environment, especially the acid rain and alkaline leachate, greatly influence the leaching behaviors of S/S heavy metal contaminated soil and threaten the environment. The leaching characteristics of the compacted S/S samples were investigated over a wide range of pH (2.65, 3.65, 5.00, 7.00, and 10.00). Semidynamic leaching tests were conducted to evaluate the effects of pH on effectiveness and controlling leaching mechanism of compacted cement S/S treated lead (Pb) contaminated soil. Results showed that there was no obviously change of the cumulative fraction of Pb leached (CFL) in weak acid or weak alkaline conditions (pH ranging from 5.00 to 10.00), and the strong acid significantly altered the leaching behaviors of Pb. The calculated values of effective diffusion coefficient (De) and leachability index (LX) indicated that the mobility of Pb2+ was weak and the compacted S/S treatment could be used for “controlled utilization” with environment pH value ranging from 3.65 to 10.00. Especially, the LX value was 8.49 when the compacted S/S sample was immersed in the leachant with pH 2.65, indicated that the S/S sample was not considered appropriate for disposal. The mechanism controlling Pb2+ leaching from S/S samples at all the pH range (2.65–10.00) appeared to be diffusion, and with pH decreasing in acid conditions, the controlling leaching mechanism somehow was changing from diffusion to surface wash‐off. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 149–155, 2016

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Influence of Natural and Accelerated Carbonation of Steel Slags on Their Leaching Behavior

Spanka

Mansfeldt

Bialucha

2016

steel research int.

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The influence of natural and accelerated carbonation on the leaching behavior of a basic oxygen furnace slag (BOS), electric arc furnace slag from carbon steel production (EAF C), and electric arc furnace slag from high-alloy/stainless steel production (EAF S) has been investigated in this study. The carbonation reaction is examined using two experimental series: (i) outdoor-exposure tests; and (ii) accelerated carbonation treatments in the laboratory. The achieved leaching results for the exposed steel slags show a distinct increase in Si and V concentrations and a decrease of Ca, with lower pH, due to carbonation. The other elements (Al, Cr, F, and Mo) react differently to carbonation depending on the mineral binding. However, the achieved results show that the German LAGA emplacement category can be improved from Z 2, for restricted applications with defined safeguarding measures, to Z 1 restricted open applications, due to carbonation. With regard to the storage of carbon dioxide (CO 2 ) in slags and CO 2 reduction of the atmosphere, the EAF S appears to be best suited for carbonation, because this slag reveals the highest CO 2 uptake. Moreover, for this slag type significant decreases of the leached amount of Al, Ca, Cr, and Mo could be achieved.[ Ã ] M. Spanka, T. Mansfeldt Figure 4. pH and electric conductivity of the eluates of basic oxygen furnace slag (BOS) electric arc furnace slag from carbon steel production (EAF C) and electric arc furnace slag from high-alloy/stainless steel production (EAF S) obtained from two experimental series (down-flow-percolation test/filled symbols and tank leaching test).

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The effects of simulated environmental attack on immobilization of heavy metals doped in cement-based materials

Cited by 67 publications

References 15 publications

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

Effects of pH on leaching behavior of compacted cement solidified/stabilized lead contaminated soil

Influence of Natural and Accelerated Carbonation of Steel Slags on Their Leaching Behavior

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