Hygrothermal stability of ettringite in blended systems with CAC-OPC-CŠ

Noor L, Rost P, Kirchberger I, Götz-Neunhoeffer F, Ideker JH (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Cement and Concrete Research Elsevier

Book Volume: 184

Article Number: 107590

DOI: 10.1016/j.cemconres.2024.107590

Abstract

The hygrothermal stability of ettringite in cementitious systems composed of calcium aluminate cement (CAC) blended with ordinary portland cement (OPC) and calcium sulfate (CŠ) has been investigated for five simulated environmental conditions- i) 23 °C-100% RH (Relative Humidity), ii) 23 °C-50% RH, iii) 38 °C-50% RH, iv) 50 °C-50% RH, and v) 60 °C-50% RH. Two types of ternary systems were used, one rich in CAC (with a higher mass ratio of CAC compared to OPC) and the other rich in OPC (with a higher mass ratio of OPC compared to CAC), both with a water-to-cement (w/c) ratio of 0.35. The volume change and mechanical properties were evaluated by dimensional change, mass change, compressive strength, and flexural strength measurements. Hydration and microstructural properties were evaluated by isothermal calorimetry, thermogravimetric analysis (TGA), and Quantitative X-Ray Diffraction (QXRD) via the G-factor method. QXRD results showed that the studied CAC-rich binder formed 26.0 ± 1 wt% and the OPC-rich binder 28.9 ± 1 wt% ettringite after 24 h of hydration. However, with the increase in temperature, decrease in relative humidity, and time of exposure, the OPC-rich binder showed higher shrinkage, higher mass loss, and a significant decrease in ettringite content compared to the CAC-rich binder.

Authors with CRIS profile

Pauline Rost Lehrstuhl für Mineralogie Irina Kirchberger Lehrstuhl für Mineralogie Friedlinde Götz-Neunhoeffer Lehrstuhl für Mineralogie

Involved external institutions

Oregon State University (OSU) US United States (USA) (US)

How to cite

APA:

Noor, L., Rost, P., Kirchberger, I., Götz-Neunhoeffer, F., & Ideker, J.H. (2024). Hygrothermal stability of ettringite in blended systems with CAC-OPC-CŠ. Cement and Concrete Research, 184. https://doi.org/10.1016/j.cemconres.2024.107590

MLA:

Noor, Lamiya, et al. "Hygrothermal stability of ettringite in blended systems with CAC-OPC-CŠ." Cement and Concrete Research 184 (2024).

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