Synergistic Effect of Polycarboxylate Superplasticiser and Protein Retarders in Cementitious Materials Containing Na- Montmorillonite: Effect of Addition Methods

Abstract

Polycarboxylate superplasticiser (PCE) is notably sensitive towards Na-Montmorillonite (Na-Mmt), an impurity generated from the manufacturing of concrete aggregate due to the chemical intercalation and poor surface adsorption. In order to improve the poor compatibility of PCE, the protein-based retarders were applied as the sacrificial agents, and its synergetic effects in cementitious materials containing Na-Mmt were investigated. The protein-based retarders were applied as the sacrificial agents and its synergetic effects in cementitious materials containing Na-Mmt were investigated. In addition to test rheology, minislump, and setting time, the adsorption behaviour and intercalation were characterised via Total Organic Carbon, X-ray photoelectron spectroscopy, and X-ray diffraction. The results revealed that the incorporation of protein-retarders improved the performance of PCE in terms of workability, and the rheological behaviour of cement with Na-Mmt. Moreover, compared to simultaneous addition, the application of separate addition further increased the workability and improved workability retention, with best dispersion performance obtained by prior adding the retarders, which could be due to the lessened intercalation between the layers of Na-Mmt.

The Structure Features and Improvement of Concrete Properties with Dead Jellyfish Mass

“…When assessing the effect of the organic substances that form DJM, it was found that the dead jellyfish mass also had surface-active properties. Based on the analyzed literature [28][29][30][31][32][33][34][35][36][37]55], the feasibility of using surfactants in concrete and concrete mixtures can be reflected in the form of an Ishikawa cause-and-effect diagram presented in Figure 18.…”

“…These types of plasticizers are adsorbed in particles of cement and microsilica, contributing to a significant increase in the workability of concrete. Also, studies [27][28][29][30] confirm that the introduction of additional components, such as methacrylic ester, aminosulfonic acid, protein retarder, hydroxypropyl methylcellulose, and others, into the composition of polycarboxylate superplasticizers helps to increase their effectiveness. No less popular are lignosulfonate-based plasticizing additives.…”

DFT study on the polyol sacrificial agents for improved clay tolerance of polycarboxylate superplasticizers

“…Although there are different evaluation methods for the measures to suppress the negative effects of clay, for XRD can intuitively reflect the changes in interlayer spacing of clay, and Zeta potential could also characterize the influence of organic compounds on clay potential. However, based on the differences in molecular weight and side chain functional groups of PCEs, the anti-clay performance and mechanism of different sacrificial agents may also vary (Alves et al, 2016;Li et al, 2018;Tian et al, 2022, Xu et al, 2016. There is still relatively insufficient research on how to further optimize the molecular structure of the sacrificial agents, matching the types and amounts of sacrificial agents corresponding to their performance.…”