Influence of Dispersant on Pressure-Sensitive Properties of Graphene Cement-Based Composites

Abstract

Abstract: Graphene can significantly improve the smart performance of cement-based composites, and dispersants are a key factor affecting the dispersion of graphene and the performance of composites. In this paper, through ultraviolet (UV) spectrophotometer, ultra-depth-of-field microscope, laser particle size analyzer and Zeta potential test, the polycarboxylate water reducing agent (PCE), polyoxyethylene (20) sorbitan monolaurate (TW-20), sodium dodecyl sulfonate (SDS) and sodium dodecyl benzene sulfonate (SDBS) on the dispersion properties of graphene were studied. The effects of four dispersants on the conductivity and pressure-sensitive properties of graphene cement-based composites were studied through DC two-electrode, DC four-electrode and AC two-electrode tests. The results show that in deionized water and cement pore solution, PCE has good dispersibility for graphene due to the synergistic effect of electrostatic repulsion and steric hindrance. In the cement pore solution, the complexation between TW-20, SDS, SDBS and Ca²⁺ leads to a significant decrease in dispersion efficiency. The conductivity and pressure-sensitive properties of graphene cement-based composites are closely related to the dispersion of graphene in the cement matrix. Graphene cement-based composites doped with PCE have the smallest resistivity and the best pressure-sensitive properties. In addition, the air-entraining effects of SDS and SDBS also affect the pore structure of the cement matrix, resulting in increased resistivity and poor pressure sensitivity.

Key words: graphene, dispersibility, pressure-sensitive property, electrical conductivity, microstructure, compatibility

CLC Number:

TU525.9

WANG Yue, WANG Qin, ZHENG Haiyu, ZHAN Dafu. Influence of Dispersant on Pressure-Sensitive Properties of Graphene Cement-Based Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2515-2526.

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