Zuo, S;
Yuan, Q;
Huang, T;
Zhang, M;
Wu, Q;
(2021)
Rheological behaviour of low-heat Portland cement paste with MgO-based expansive agent and shrinkage reducing admixture.
Construction and Building Materials
, 304
, Article 124583. 10.1016/j.conbuildmat.2021.124583.
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Abstract
The combined use of low heat Portland cement (LHC), MgO-based expansive agent (MEA) and shrinkage reducing admixture (SRA) is beneficial to reduce the cracking risk of concrete. In this study, the effects of MEA and SRA on the rheological behaviour of LHC paste were investigated using dynamic and static shearing tests. The response surface methodology was used to estimate the effects of MEA, SRA, and superplasticizer on dynamic rheological parameters, while the zeta potential, calorimetric, and solid phases tests were conducted to explore the mechanisms of time-dependent rheological behaviour. Results indicate that MEA contributes to higher dynamic yield stress and plastic viscosity, while the effect of SRA is dependent on its dosage. MEA promotes the static yield stress development for accelerating the hydration of blends and the formation of Mg(OH)_{2}. SRA retards the hydration of LHC and blended paste and reduces the number of main hydration products. However, the static yield stress is further increased by SRA, showing a consistent changing trend with the surface area of hydrated particles.
| Type: | Article |
|---|---|
| Title: | Rheological behaviour of low-heat Portland cement paste with MgO-based expansive agent and shrinkage reducing admixture |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.conbuildmat.2021.124583 |
| Publisher version: | https://doi.org/10.1016/j.conbuildmat.2021.124583 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Magnesium oxide, Rheology, Yield stress, Plastic viscosity, Microstructure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10133628 |
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