Role of Steric Hindrance in the Performance of Superplasticizers for Concrete

By Kazuhiro Yoshioka, E. Sakai, M. Daimon, A. Kitahara. 2005

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The effect of superplasticisers on the workability and compressive strength of concrete made with fine recycled concrete aggregates (2012, background): “SP2 is made with polycarboxylic acids and so the dispersion phenomenon is mainly due to a steric hindrance effect [27,28] which increases the zeta potential of cement particles [29], and thus the presence of RCFA seems to have less effect on SP2’s performance than it does on SP1’s.”
Synthesis and performance of methacrylic ester based polycarboxylate superplasticizers possessing hydroxy terminated poly(ethylene glycol) side chains (2008, background): “Such an increase towards the isoelectric point (0 mV) is typical for SPs which disperse cement due to a steric stabilization effect [18].”
Development of a self-consolidating engineered cementitious composite employing electrosteric dispersion/stabilization (2003, unknown): “Keywords: Self-consolidating ECC; Strong polyelectrolyte; Non-ionic polymer; Electrosteric stabilization; Rheological design”
Compatibility between polycarboxylate-based admixtures and blended-cement pastes (2013, unknown): “The factors associated with admixtures that determine their performance and fluidizing effect are their dosage, the manner and timing of inclusion in the mix and their chemical and structural composition [4–8].”