Rheological Properties and Stability of Self-Consolidating Concrete

The rheology of self-consolidating concrete centres on its ability to flow under its own weight while maintaining uniformity without external vibration. Key parameters include yield stress, which governs the onset of flow, and plastic viscosity, which dictates the resistance to continued deformation. Optimisation of these properties is achieved through careful selection of water-binder ratio, particle packing, viscosity-modifying admixtures and supplementary cementitious materials. Stability relates to the concrete’s resistance to segregation, bleeding and formwork pressure, ensuring homogeneous distribution of aggregates and paste. Excessive segregation may compromise mechanical performance, durability and aesthetic finish, while poor bleeding control can lead to surface defects and reduced strength. Recent efforts have sought to standardise assessment methods—such as rheometers, flow spreads and visual stability indices—to reliably characterise fresh behaviour and prevent instabilities across diverse climates and construction practices. An improved understanding of microstructural interactions and thixotropic recovery has broadened the global application of self-consolidating mixes in complex geometries, high-rise structures and repair works, where reduced labour, faster cycle times and enhanced durability are critical.

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Rheological Properties and Stability of Self-Consolidating Concrete publication trend

The graph below shows the total number of articles in rheological properties and stability of self-consolidating concrete across all publications each year (not limited to Nature Index journals).

Technical terms

Self-consolidating concrete: A highly flowable, non-segregating concrete that spreads into place and fills formwork under its own weight.

Yield stress: The minimum shear stress required to initiate flow in a concrete mixture.

Plastic viscosity: The measure of a fluid’s resistance to flow once yield stress has been exceeded.

Segregation: The separation of coarse aggregates from the mortar matrix in fresh concrete, leading to non-uniform composition.

Bleeding: The upward migration of water to the surface of fresh concrete, which can lead to surface defects and reduced strength.

Thixotropy: The reversible, time-dependent decrease in viscosity under sustained shear followed by structural rebuilding at rest.

References

1. Investigating the Effectiveness of the Stable Measurement Tests of Self-Compacting Concrete. Construction and Building Materials (2023).
2. Monitoring of concrete segregation using AC impedance spectroscopy. Construction and Building Materials (2023).
3. Impact of vibrations on the final characteristics of normal and self-compacting concrete. Materials Research (2013).