TY  - JOUR
N2  - 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.
ID  - discovery10133628
KW  - Magnesium oxide
KW  -  Rheology
KW  -  Yield stress
KW  -  Plastic viscosity
KW  -  Microstructure
AV  - public
Y1  - 2021/10/18/
A1  - Zuo, S
A1  - Yuan, Q
A1  - Huang, T
A1  - Zhang, M
A1  - Wu, Q
UR  - https://doi.org/10.1016/j.conbuildmat.2021.124583
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
JF  - Construction and Building Materials
TI  - Rheological behaviour of low-heat Portland cement paste with MgO-based expansive agent and shrinkage reducing admixture
VL  - 304
PB  - Elsevier BV
ER  -