Tailoring the anionic function and the side chains of comb-like superplasticizers to improve their adsorption

Fluidizing efficiency of comb-like superplasticizers: The effect of the anionic function, the side chain length and the grafting degree

“…Indeed as suggested by Flatt and co. [3] the differences between the chemical structures should not induce significant effects on the PCE conformation and then on the surface occupied by the polymer adsorbed. This is also supported by the similar adsorption plateau values measured with these polymers in the absence of sulfate (~0.8-0.9 mg/m 2 ) [32,33].…”

“…The adsorption of highly charged PCE is insensitive to the ionic conditions (presence of sulfate) and gives a plateau value of 0.85 mg/m 2 . More details on the adsorption data can be found in the Supplementary data of this paper and in [32,33]. For the surface coverage studied (b 50%), we assumed an incertitude of ±2% on the surface coverage.…”

Advances in understanding hydration of Portland cement

“…The authors observed that that a partial substitution of carboxyl by trialkoxysilane groups enhances the adsorption; however, an excess of silylated functions can be detrimental for adsorption. Recently, Dalas et al [91] reported that comb-like polymers with dicarboxylate or phosphate function are less sensitive or insensitive to the adsorption competition with sulfate ions. Cheung et al [55] carefully discussed the complex interactions of chemical admixtures on the aluminate-sulfate balance, particularly for high-calcium fly ash systems.…”

Effect of the different hydrophobic groups of polycarboxylate superplasticizers on the properties in cement mortars

“…Superplasticizers have witnessed a tremendous rise in the number of enhancing the flowability of the cement‐based media in the past few years . Especially, polycarboxylate superplasticizers (PCEs) for the reduction of water demand has attracted great attention due to their unique structural properties of fluidity and dispersibility compared to traditional polyelectrolyte dispersants, such as excellent water reducing ratio and high workability retention at a low dosage . Recently, there has been a growing interest in the various PCEs with a tunable molecular structure in polymer backbone and potentially designable polymer configuration .…”