Effect of PCE modifying C-S-H on the properties of grouting material for offshore wind power (GMWP)

Abstract

Nano-C-S-H-PCE exhibits a favorable influence on the early strength of cement; however, there is limited research available regarding the utilization of micron C-S-H-PCE as a grouting material for offshore wind power (GMWP) applications. This study aims to investigate the influence of micron C-S-H-PCE on the properties of grouting materials specifically designed for offshore wind power projects. Hydration kinetics, XRD, TG/DTG, BSE and SEM were used to analyze the heat of hydration, phase of hydration products and morphology of hydration products. The research shows that the early strength of grouting material for offshore wind power (GMWP) significantly increased before 24 h. And the compression strength is increased by 270 % after 14 h, without shrinkage. Which the fluidity increased from 294 mm to 335 mm after 30 min. There is no negative effect on the vertical expansion rate of offshore wind power grout (GMWP). When the content of C-S-H-PCE reached 0.8 %, the compressive strength of grouting material for offshore wind power (GMWP) after undergoing 60 d erosion in an artificial seawater environment increased to 100.0 MPa. Which also enhances its resistance against seawater erosion. It is concluded that adding C-S-H-PCE to the grouting material for offshore wind power (GMWP) can remarkably decrease the nucleation barrier E_α of the hydration reaction, which involving the process of increasing the consumption of C₃S, and enhancing the hydration rate. The incorporation of C-S-H-PCE accelerated the hydration process, resulting in an augmented production of CH and C-S-H, thereby reducing the inter-particle pores formed during early hydration. This study will provide a theoretical foundation for utilizing micron-sized C-S-H-PCE in grouting material for offshore wind power (GMWP).