Effect of hydroxide, carbonate, and sulphate anions on the β-dicalcium silicate hydration rate

Muhammad Jawad Ahmed; Kim Lambrechts; Xuan Ling; Katrin Schollbach; H.J.H. (Jos) Brouwers

doi:10.1016/j.cemconres.2023.107302

Effect of hydroxide, carbonate, and sulphate anions on the β-dicalcium silicate hydration rate

Muhammad Jawad Ahmed (Corresponding author)
, Kim Lambrechts
, Xuan Ling
, Katrin Schollbach
, H.J.H. (Jos) Brouwers

Building Materials

Research output: Contribution to journal › Article › Academic › peer-review

38 Citations (Scopus)

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Abstract

The effect of fixed (0.8 M) Na+ balanced by either OH−, SO42−, and CO32− anions on β-dicalcium silicate (C2S) reactivity is investigated. The exothermic reaction of varying water-to-solid ratios and chemical activation is monitored. Subsequently, the hydration products are characterized via FTIR, TG/DTG, QXRD, and SEM analysis. The findings showed that the carbonate ions expedited the reactivity up to 55% at 1–7 days due to the simultaneous precipitation of calcium silicate hydrate (C-S-H) and calcite. At 7–28 days, the lack of transportable cations between the solid surface and solution impeded further hydration, as confirmed by in-situ pH and conductivity measurements. The sulphate ions accelerated the reactivity only upon calcium sulphate dissolution at high pH. The hydroxide ions decelerated the hydration due to the earlier precipitation of portlandite than C-S-H. Overall, the β-C2S reaction with water exhibited the highest hydration degree (~67%) after 28 days of hydration.

Original language	English
Article number	107302
Number of pages	11
Journal	Cement and Concrete Research
Volume	173
DOIs	https://doi.org/10.1016/j.cemconres.2023.107302
Publication status	Published - Nov 2023

Funding

The authors would like to acknowledge the financial support by NWO (The Netherlands Organisation for Scientific Research ) for funding this research (project no. 10023338 ) and M2i ( Materials Innovation Institute , project no. S81.6.15565b ) for managing this project. Additionally, the authors wish to express their appreciation to Sieger van der Laan for his revision and guidance. Furthermore, the authors wish to express their gratitude to the following sponsors of this research: Tata Steel; ENCI; V.d. Bosch Beton; Blue Phoenix Group; Hess.

Funders	Funder number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek	10023338
Materials Innovation Institute (M2i)

Keywords

Anions
Dissolution-precipitation
Hydration degree
In-situ conductivity
β-Dicalcium silicate

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title = "Effect of hydroxide, carbonate, and sulphate anions on the β-dicalcium silicate hydration rate",

abstract = "The effect of fixed (0.8 M) Na+ balanced by either OH−, SO42−, and CO32− anions on β-dicalcium silicate (C2S) reactivity is investigated. The exothermic reaction of varying water-to-solid ratios and chemical activation is monitored. Subsequently, the hydration products are characterized via FTIR, TG/DTG, QXRD, and SEM analysis. The findings showed that the carbonate ions expedited the reactivity up to 55\% at 1{\textendash}7 days due to the simultaneous precipitation of calcium silicate hydrate (C-S-H) and calcite. At 7{\textendash}28 days, the lack of transportable cations between the solid surface and solution impeded further hydration, as confirmed by in-situ pH and conductivity measurements. The sulphate ions accelerated the reactivity only upon calcium sulphate dissolution at high pH. The hydroxide ions decelerated the hydration due to the earlier precipitation of portlandite than C-S-H. Overall, the β-C2S reaction with water exhibited the highest hydration degree (\textasciitilde{}67\%) after 28 days of hydration.",

keywords = "Anions, Dissolution-precipitation, Hydration degree, In-situ conductivity, β-Dicalcium silicate",

author = "Ahmed, \{Muhammad Jawad\} and Kim Lambrechts and Xuan Ling and Katrin Schollbach and Brouwers, \{H.J.H. (Jos)\}",

year = "2023",

month = nov,

doi = "10.1016/j.cemconres.2023.107302",

language = "English",

volume = "173",

journal = "Cement and Concrete Research",

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AU - Ahmed, Muhammad Jawad

AU - Lambrechts, Kim

AU - Ling, Xuan

AU - Schollbach, Katrin

AU - Brouwers, H.J.H. (Jos)

PY - 2023/11

Y1 - 2023/11

N2 - The effect of fixed (0.8 M) Na+ balanced by either OH−, SO42−, and CO32− anions on β-dicalcium silicate (C2S) reactivity is investigated. The exothermic reaction of varying water-to-solid ratios and chemical activation is monitored. Subsequently, the hydration products are characterized via FTIR, TG/DTG, QXRD, and SEM analysis. The findings showed that the carbonate ions expedited the reactivity up to 55% at 1–7 days due to the simultaneous precipitation of calcium silicate hydrate (C-S-H) and calcite. At 7–28 days, the lack of transportable cations between the solid surface and solution impeded further hydration, as confirmed by in-situ pH and conductivity measurements. The sulphate ions accelerated the reactivity only upon calcium sulphate dissolution at high pH. The hydroxide ions decelerated the hydration due to the earlier precipitation of portlandite than C-S-H. Overall, the β-C2S reaction with water exhibited the highest hydration degree (~67%) after 28 days of hydration.

AB - The effect of fixed (0.8 M) Na+ balanced by either OH−, SO42−, and CO32− anions on β-dicalcium silicate (C2S) reactivity is investigated. The exothermic reaction of varying water-to-solid ratios and chemical activation is monitored. Subsequently, the hydration products are characterized via FTIR, TG/DTG, QXRD, and SEM analysis. The findings showed that the carbonate ions expedited the reactivity up to 55% at 1–7 days due to the simultaneous precipitation of calcium silicate hydrate (C-S-H) and calcite. At 7–28 days, the lack of transportable cations between the solid surface and solution impeded further hydration, as confirmed by in-situ pH and conductivity measurements. The sulphate ions accelerated the reactivity only upon calcium sulphate dissolution at high pH. The hydroxide ions decelerated the hydration due to the earlier precipitation of portlandite than C-S-H. Overall, the β-C2S reaction with water exhibited the highest hydration degree (~67%) after 28 days of hydration.

KW - Anions

KW - Dissolution-precipitation

KW - Hydration degree

KW - In-situ conductivity

KW - β-Dicalcium silicate

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DO - 10.1016/j.cemconres.2023.107302

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SN - 0008-8846

VL - 173

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JF - Cement and Concrete Research

M1 - 107302

ER -

Effect of hydroxide, carbonate, and sulphate anions on the β-dicalcium silicate hydration rate

Abstract

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Keywords

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