Synthesis, Performance, and Mechanism of Polycarboxylate Superplasticizers Containing Adsorption Groups

Abstract

This article presents a preparation method for a tailing sand-specific polycarboxylate superplasticizer (AT9) containing multifunctional adsorption groups. By designing multifunctional adsorption groups (−COOH) as side chains grafted onto the main chain of conventional polycarboxylate ether, the antiadsorption effect is achieved. AT9 was characterized by gel permeation chromatography, and its performance was systematically evaluated in various tailings sand-cement mortar systems. A comparison was made between AT9 and traditional PCE in terms of their effects on the workability of concrete, and the interaction mechanism between AT9 and clay in cementitious systems was discussed. The results indicate that AT9 enhances the adsorption and dispersion effects of polycarboxylate superplasticizers on cement particles, and increases steric hindrance, thereby avoids intercalation adsorption of tailings sand, improves its water-reducing and slump-retaining performance, and also contributes to the strength enhancement of concrete in later stages.

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