High-ferrite Portland cement with slag: Hydration, microstructure, and resistance to sulfate attack at elevated temperature

作者：Yang, H. M.; Zhang, S. M.; Wang, L.; Chen, P.; Shao, D. K.; Tang, S. W.^*; Li, J. Z.^*

来源：CEMENT & CONCRETE COMPOSITES, 2022, 130: 104560.

DOI：10.1016/j.cemconcomp.2022.104560

• High-ferrite portland cement (HFPC)
• Temperature
• Slag
• Hydration
• Pore structure
• Sulfate attack

Among the four mineral components in cement, C(4)AF has been demonstrated to have satisfactory corrosion resistance to sulfate attack. Here, high-ferrite Portland cement (HFPC) is used to prepare high corrosion-resistance cement-based materials. The hydration mechanisms and pore structures of HFPC pastes containing different slag dosages are studied at 20 ?, 40 ?, and 60 ?. The results indicate that the elevated temperature greatly stimulates the slag activity and significantly promotes the hydration of HFPC/slag blends. As the temperature increases, the heat curve of the cement pastes with high content slag shows a third or fourth exothermic peak. The hydration of pastes with more than 40% slag is controlled by the nucleation of hydrates in the acceleration stage and by the diffusion of ions in the deceleration stage above 40 ?. In addition, the HFPC pastes show excellent mechanical properties in a high-temperature environment. The HFPC pastes exhibit better sulfate attack resistance performance compared with pure ordinary Portland cement (OPC) ones. Therefore, the excellent performance of HFPC-based materials can be applied in the construction of concrete in mass under the environment of the South Sea in China, to solve the problems of high environmental temperature, large temperature differences, and sulfate attack.

• 单位
  武汉大学; 桂林理工大学