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A study on the adsorption and dispersion capability of VPEG-PCEs with different structures on cement containing montmorillonite
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DOI：10.1016/j.cemconres.2026.108348.png)
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Abstract
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Polycarboxylate ether (PCE) superplasticizer exhibits excellent dispersion and water-reducing capability, but its poor tolerance to montmorillonite (MMT) limits the application. This paper synthesized PCEs with multi-branches structure and their molecular structures were characterized by Gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), 1H-nuclear magnetic resonance (1H-NMR) spectroscopy and specific charge density. The adsorption behaviors of the synthesized PCEs on cement and MMT were investigated. The time-dependent flowability of the paste with these PCEs were measured, and the hydration of cement were examined. Based on that, the interaction mechanisms between these PCEs and MMT were revealed. Results show that the novel PCEs exhibit stronger dispersion capability in cement containing MMT system and have the lower relative flowability loss values than that of comb-like PCE (VPCE). Interestingly, the performance of the PCE grafted polyethylene glycol diacrylate (PPCE) shows higher dependence on the content of MMT. At a low MMT content, it exhibits stronger tolerance to MMT than the PCE with N'N methylene bisacrylamide monomer (MPCE), but the flowability of paste significantly decreases with the increase of MMT.
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