Characterization of blast furnace slag-blended Portland cement for immobilization of Co

Yoon, H.N.; Seo, Joonho; Kim, Seonhyeok; Lee, Haeng‐Ki; Park, Solmoi

doi:10.1016/j.cemconres.2020.106089

Cited by 28 publications

(21 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For example, this happens with the application of limestone filler as well as in cement, such as blast furnace slag, and in pozzolanic products, such as metakaolin, fly ash, agro-industrial ash, and silica fume [ 85 , 88 , 89 ]. Cementing additions are materials, usually based on calcium, that present an accelerated reaction capacity in the presence of alkaline media, as is the case of Ca(OH) 2 of portlandite present in OPC [ 90 , 91 ]. They can also be activated with the use of other alkaline hydroxides, such as NaOH and KOH, through alkaline activation, dispensing in this case, the presence of OPC [ 92 , 93 ].…”

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

103

View full text Add to dashboard Cite

This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

show abstract

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

103

View full text Add to dashboard Cite

show abstract

“…Monovalent and divalent anions and cations may also be incorporated in these phases [2,8,10,14,17,22,34,35,41,45,49]. The uptake of divalent metal cations in these phases occurs through the precipitation of the metal hydroxides on the surfaces, intercalation by structural incorporation, and adsorption by the surface hydroxyl groups [17,49]. Ettringite can act as a host to numerous ions, including Ca 2+ , Al 3+ , SO 4 2− and OH -, through chemical substitution in both the column and channel sections of its structure [9].…”

Section: Encapsulation and Hydrate Naturementioning

confidence: 99%

“…GGBFS is a commonly used and well-known supplementary cementitious material for concrete. It has often been used as a component in mixtures for heavy metal encapsulation [10][11][12][13][14][15][16][17][18][19]. LFS is a lesser known material and a by-product of steel manufacture which typically has both amorphous and crystalline phases with large amounts of aluminum and calcium [20].…”

Section: Introductionmentioning

confidence: 99%

Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

et al. 2020

View full text Add to dashboard Cite

Mixing municipal solid waste incineration fly ash (MSWIFA) with industrial by-products such as ground granulated blast furnace slag (GGBFS) and ladle furnace slag (LFS) can lead to a hardened system which can encapsulate the heavy metals present in the MSWIFA. The objective of this study is to find optimal mixture designs to effectively encapsulate these heavy metals. The nature of the hydrates and the strength of the mixtures are studied to develop a sustainable and practical construction material incorporating MSWIFA. Heavy metals including Cr, Cu, Zn and Cd are safely encapsulated in several developed mixtures with leachate concentration below EPA drinking water limit. The encapsulation behavior is complex and depends on metal type, age of testing, and hydration products. In general, mixtures containing LFS have more aluminate hydrates, and show greater encapsulation capacity for most heavy metals. However, they also generally show significant Sb leaching. Mixtures which show satisfactory encapsulation for all ions and adequate strength development are identified. Three ideal mixtures, including one containing zero cement, are identified which satisfy both leaching and strength requirements.

show abstract

“…The retention capacities of solidified matrixes for the immobilization of radioactive wastes are evaluated using leaching tests. Numerous leaching-test protocols for evaluating the performance of immobilization were used in previous studies, e.g., the American Nuclear Society ANSI/ANS-16.1 [19][20][21][22][23][24], the International Atomic Energy Agency static test [18,25], ASTMC1285 [26,27], and the Chinese GB7023-86 standard [28,29]. The leachability index derived from these leaching tests is generally used for evaluating the immobilization performance of solidified decommissioning wastes; the result should be greater than 6 as the threshold value for waste-acceptance criteria [30].…”

Section: Introductionmentioning

confidence: 99%

Leaching Behavior of Cesium, Strontium, Cobalt, and Europium from Immobilized Cement Matrix

Goo

Kim

Kang³

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

Numerous low-level and intermediate-level radioactive wastes are generated from the decommissioning processes of nuclear power plants; these wastes are immobilized to prevent the release of radionuclides under disposal conditions. In this study, we investigated the leaching behavior of Cs, Sr, Co, and Eu, which are common in immobilized decommissioning wastes. Ordinary Portland cement (OPC) was used as an immobilization agent. During the test, leaching of the nuclides occurred in the order of Cs, Sr, Co, and Eu and decreased over time. The results showed that 41.4% of the total Cs leached over 90 days, although the other elements leached in quantities less than 1.5%. CaCO3 was precipitated by the release of cementitious materials, indicating carbonation of the leachate. The leachability indexes in all cases exceeded the acceptable criteria (>6). The results of the present study suggest that OPC can be effectively used as a binding material to immobilize nuclides (Cs, Sr, Co, and Eu) contained in decommissioning wastes.

show abstract

Characterization of blast furnace slag-blended Portland cement for immobilization of Co

Cited by 28 publications

References 33 publications

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

Leaching Behavior of Cesium, Strontium, Cobalt, and Europium from Immobilized Cement Matrix

Contact Info

Product

Resources

About