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A platform for research: civil engineering, architecture and urbanism
Rheological behaviour of low-heat Portland cement paste with MgO-based expansive agent and shrinkage reducing admixture
Highlights The rheological properties of LHC pastes with MEA and SRA were studied. The variations of dynamic yield stress and plastic viscosity were estimated by response surface methodology. The roles of MEA and SRA on the static yield stress development of LHC pastes were investigated.
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.
Rheological behaviour of low-heat Portland cement paste with MgO-based expansive agent and shrinkage reducing admixture
Highlights The rheological properties of LHC pastes with MEA and SRA were studied. The variations of dynamic yield stress and plastic viscosity were estimated by response surface methodology. The roles of MEA and SRA on the static yield stress development of LHC pastes were investigated.
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.
Rheological behaviour of low-heat Portland cement paste with MgO-based expansive agent and shrinkage reducing admixture
Zuo, Shenghao (author) / Yuan, Qiang (author) / Huang, Tingjie (author) / Zhang, Mingzhong (author) / Wu, Qihong (author)
2021-08-13
Article (Journal)
Electronic Resource
English
Reducing the drying shrinkage of cement paste by admixture surface treatments
| Online Contents | 2000
Reducing the drying shrinkage of cement paste by admixture surface treatments
| British Library Online Contents | 2000
Reducing the drying shrinkage of cement paste by admixture surface treatments
| Tema Archive | 2000