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

H. N. Yoon; Joonho Seo; Seonhyeok Kim; H. K. Lee; Solmoi Park

doi:10.1016/j.cemconres.2020.106089

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

H. N. Yoon, Joonho Seo, Seonhyeok Kim, H. K. Lee, Solmoi Park

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33 Scopus citations

Abstract

The leaching behavior of Co²⁺ from blast furnace slag-blended cement is investigated. Semi-dynamic leaching test results show that the performance of the cement with regard to the retention of Co²⁺ is increased by replacing Portland cement with slag (~70 wt%). The changes in the formation and structure of calcium-silicate-hydrate gels in the blended cement as a function of the slag content are insignificant after 28 days of curing, while slag in the binder leads to the formation of more layered double-hydroxide (LDH) structured phases, including AFm and Co[sbnd]Al LDH phases. The enhanced Co uptake by the LDH phases together with the refined pore structure of the slag-blended cement significantly improves the performance for retention of Co²⁺ in the cement matrix.

Original language	English
Article number	106089
Journal	Cement and Concrete Research
Volume	134
DOIs	https://doi.org/10.1016/j.cemconres.2020.106089
State	Published - Aug 2020
Externally published	Yes

Keywords

Blast furnace slag
Cementation
Cobalt
Immobilization
Solidification

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10.1016/j.cemconres.2020.106089

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title = "Characterization of blast furnace slag-blended Portland cement for immobilization of Co",

abstract = "The leaching behavior of Co2+ from blast furnace slag-blended cement is investigated. Semi-dynamic leaching test results show that the performance of the cement with regard to the retention of Co2+ is increased by replacing Portland cement with slag (\textasciitilde{}70 wt\%). The changes in the formation and structure of calcium-silicate-hydrate gels in the blended cement as a function of the slag content are insignificant after 28 days of curing, while slag in the binder leads to the formation of more layered double-hydroxide (LDH) structured phases, including AFm and Co[sbnd]Al LDH phases. The enhanced Co uptake by the LDH phases together with the refined pore structure of the slag-blended cement significantly improves the performance for retention of Co2+ in the cement matrix.",

keywords = "Blast furnace slag, Cementation, Cobalt, Immobilization, Solidification",

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doi = "10.1016/j.cemconres.2020.106089",

language = "English",

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journal = "Cement and Concrete Research",

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T1 - Characterization of blast furnace slag-blended Portland cement for immobilization of Co

AU - Yoon, H. N.

AU - Seo, Joonho

AU - Kim, Seonhyeok

AU - Lee, H. K.

AU - Park, Solmoi

PY - 2020/8

Y1 - 2020/8

N2 - The leaching behavior of Co2+ from blast furnace slag-blended cement is investigated. Semi-dynamic leaching test results show that the performance of the cement with regard to the retention of Co2+ is increased by replacing Portland cement with slag (~70 wt%). The changes in the formation and structure of calcium-silicate-hydrate gels in the blended cement as a function of the slag content are insignificant after 28 days of curing, while slag in the binder leads to the formation of more layered double-hydroxide (LDH) structured phases, including AFm and Co[sbnd]Al LDH phases. The enhanced Co uptake by the LDH phases together with the refined pore structure of the slag-blended cement significantly improves the performance for retention of Co2+ in the cement matrix.

AB - The leaching behavior of Co2+ from blast furnace slag-blended cement is investigated. Semi-dynamic leaching test results show that the performance of the cement with regard to the retention of Co2+ is increased by replacing Portland cement with slag (~70 wt%). The changes in the formation and structure of calcium-silicate-hydrate gels in the blended cement as a function of the slag content are insignificant after 28 days of curing, while slag in the binder leads to the formation of more layered double-hydroxide (LDH) structured phases, including AFm and Co[sbnd]Al LDH phases. The enhanced Co uptake by the LDH phases together with the refined pore structure of the slag-blended cement significantly improves the performance for retention of Co2+ in the cement matrix.

KW - Blast furnace slag

KW - Cementation

KW - Cobalt

KW - Immobilization

KW - Solidification

UR - https://www.scopus.com/pages/publications/85084952475

U2 - 10.1016/j.cemconres.2020.106089

DO - 10.1016/j.cemconres.2020.106089

M3 - Article

AN - SCOPUS:85084952475

SN - 0008-8846

VL - 134

JO - Cement and Concrete Research

JF - Cement and Concrete Research

M1 - 106089

ER -

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

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Keywords

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