- 盖珂瑜1,2，龙 勇1,2，刘爱林3，黄 斌3，王亚洲1,2
2023年第4期
摘要
引用本文
摘 要：以水泥、粉煤灰和石灰石粉为胶凝材料，制备了一种低温升主塔大体积混凝土，研究了石灰石粉掺量（5%、10%、15%）对砂浆流变性能和混凝土绝热温升、干燥收缩性能、力学性能、抗渗性能的影响，采用SEM观察了水化产物的微观形貌，并与水泥-粉煤灰-矿渣粉胶凝体系（对照组）进行了对比。结果表明：与对照组相比，掺入石灰石粉可以降低砂浆的塑性黏度和屈服应力，延缓胶凝材料的水化进程，降低混凝土的绝热温升；石灰石粉的掺量越大，抑制混凝土干燥收缩的作用越显著；随着石灰石粉掺量的增加，混凝土的抗压强度下降，但掺5%石灰石粉混凝土的抗压强度较对照组高；与对照组相比，掺石灰石粉混凝土的抗渗性能较好，掺5%石灰石粉混凝土的抗渗性能最好。
Abstract: Taking cement, fly ash and limestone powder as cementitious materials, the mass concrete with low temperature rise for main tower was prepared. The effects of limestone powder content(5%, 10%, 15%) on the rheological properties of mortar, adiabatic temperature rise, drying shrinkage, mechanical properties and impermeability of concrete were studied, and the microscopic morphology of hydration products was observed by SEM. The results were compared with those of cement-fly ash-slag powder cementitious system (control group). The results show that compared with the control group, adding limestone powder can reduce the plastic viscosity and yield stress of mortar, delay the hydration process of cementitious materials, and reduce the adiabatic temperature rise of concrete. The greater the content of limestone powder, the more significant the effect of inhibiting the drying shrinkage of concrete. With the increase of limestone powder content, the compressive strength of concrete decreases, but the compressive strength of concrete mixed with 5% limestone powder is higher than that of control group. Compared with the control group, the impermeability of concrete mixed with limestone powder is better, and the impermeability of concrete mixed with 5% limestone powder is the best.
盖珂瑜,龙勇,刘爱林,等.石灰石粉对主塔大体积混凝土性能的影响[J].混凝土与水泥制品,2023(4):88-92.
GE Ke-yu, LONG Yong, LIU Ai-lin,et al.Effects of Limestone Powder on Properties of Mass Concrete for Main Tower[J].China Concrete and Cement Products,2023(4):88-92.
