Uptake of chloride and isosaccharinic acid by cement paste with high slag content (CEM III/C)open access
- Authors
- Jo, Yongheum; Lothenbach, Barbara; Cevirim-Papaioannou, Nese; de Blochouse, Benny; Altmaier, Marcus; Gaona, Xavier
- Issue Date
- Jun-2024
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Sorption; Chloride; Isosaccharinic acid (ISA); Cement paste; High slag content
- Citation
- CEMENT AND CONCRETE RESEARCH, v.180, pp 1 - 10
- Pages
- 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- CEMENT AND CONCRETE RESEARCH
- Volume
- 180
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/194765
- DOI
- 10.1016/j.cemconres.2024.107509
- ISSN
- 0008-8846
1873-3948
- Abstract
- The uptake of chloride (Cl - ) and isosaccharinic acid (ISA, main degradation product of cellulose) by cement paste with high slag content (CEM III/C) was investigated with batch sorption experiments with 36 Cl and inactive ISA. A weak uptake of chloride was quantified (0.43 <= R d [L center dot kg - 1 ] <= 5.8), consistently with previous observations for Portland cement. C -S -H, AFm and hydrotalcite are suggested as primary sinks for Cl - . XRD confirmed the formation of Friedel's salt at [NaCl] >= 1 M, consistent with thermodynamic calculations. ISA exhibited moderate sorption (9 <= R d [L center dot kg - 1 ] <= 900), successfully modeled with a one -site Langmuir isotherm. Sorption data supports that (surface) precipitation occurs at higher ISA concentrations. The formation of stable Ca-ISA aqueous complexes promotes the incongruent dissolution of cement phases, altering of the overall Ca:Si ratio. The interplay between sorption and solubility phenomena must be considered for a correct interpretation of cement-ISA systems.
The uptake of chloride (Cl− ) and isosaccharinic acid (ISA, main degradation product of cellulose) by cement paste with high slag content (CEM III/C) was investigated with batch sorption experiments with 36Cl and inactive ISA. A weak uptake of chloride was quantified (0.43 ≤ Rd [L•kg− 1] ≤ 5.8), consistently with previous observations for Portland cement. C-S-H, AFm and hydrotalcite are suggested as primary sinks for Cl− . XRD confirmed the formation of Friedel’s salt at [NaCl] ≥ 1 M, consistent with thermodynamic calculations. ISA exhibited moderate sorption (9 ≤ Rd [L•kg− 1] ≤ 900), successfully modeled with a one-site Langmuir isotherm. Sorption data supports that (surface) precipitation occurs at higher ISA concentrations. The formation of stable Ca-ISA aqueous complexes promotes the incongruent dissolution of cement phases, altering of the overall Ca:Si ratio. The interplay between sorption and solubility phenomena must be considered for a correct interpretation of
cement-ISA systems.
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