Mechanisms of Polycarboxylate Ether Superplasticizers: Influence on the Rheology and Hydration of Cement – A Review
Subject Areas : پلیمرها در انرژی و کاربردهای بهداشتی و محیطی
Atefeh Nejadebrahim
1
,
Mohsen Najafi
2
,
Mohammad hosein Bagheri
3
1 - olymer Engineering Department, Qom University of Technology, P.O. Box: 1519-37195, Qom, Iran
2 - Polymer Engineering Department, Qom University of Technology, P.O. Box: 1519-37195, Qom, Iran
3 - Polymer Engineering Department, Qom University of Technology, P.O. Box: 1519-37195, Qom, Iran
Keywords: polycarboxylate Ether superplasticizer, Water Reduction, Cement, Rheology, Slump Retaining, chemical Structure,
Abstract :
polycarboxylate ether (PCE) superplasticizers, as the advanced generation of chemical admixtures for concrete, play a crucial role in improving rheological properties, enhancing fluidity, reducing the water-to-cement ratio, and ultimately increasing the mechanical strength and durability of concrete. In recent years, the use of these compounds has grown significantly due to the ability to precisely control their molecular structure and tailor their functional properties. Numerous studies have shown that the performance of PCE superplasticizers depends on factors such as the type and ratio of monomers used, final molecular weight, length and density of side chains, and reaction conditions.
This review provides a comprehensive discussion of recent advances in the design and synthesis of PCE polymers, their influence on the physical, chemical, and rheological characteristics of cementitious systems, and their role in the hydration process. The main mechanisms involved include electrostatic repulsion, steric hindrance, pressure release, enhanced wetting, and uniform dispersion of cement particles. The presence of functional groups such as carboxylates and polyether side chains in the polymer structure establishes an optimal balance between surface adsorption and dispersion stability. Moreover, modification of side-chain length and density, adjustment of molecular weight distribution, increased negative charge density, and improved compatibility with various types of cement are among the key strategies for enhancing their performance. Overall, understanding the relationship between chemical structure and rheological behavior paves the way for the development of more efficient and sustainable admixtures for next-generation concrete systems.
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