Luan Congqi, Yang Qingchun, Lin Xinru, Gao Xin, Cheng Heng, Huang Yongbo, Du Peng, Zhou Zonghui, Wang Jinbang
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China.
School of Materials Science and Engineering, University of Jinan, Jinan 250022, China.
Materials (Basel). 2023 Mar 12;16(6):2281. doi: 10.3390/ma16062281.
This study investigated the effect of the interaction between ultrafine slag powder (USL) and limestone (LS) on the rheology behavior, microstructure, and fractal features of UHPC. The results indicated that B2 with mass ratio of 2:1 between the USL and LS obtained the highest compressive strength and the lowest yield stress. The combination of the USL and LS facilitated the cement hydration, ettringite, and monocarboaluminate (Mc) formation, as well as the increase in the polymerization of the C-S-H. The synergistic action between the USL and LS refined the pore structure due to the formation of the Mc, compensating for the consumption of the CH by the pozzolanic reaction, which provided a denser microstructure in the UHPC. The fractal dimension (Ds) of the UHPC was strongly related to the concrete pore structures and the compressive strength, which demonstrated that a new metric called the Ds value may be used to assess the synergistic effect of the UHPC.
本研究探讨了超细矿渣粉（USL）与石灰石（LS）之间的相互作用对超高性能混凝土（UHPC）流变行为、微观结构和分形特征的影响。结果表明，USL与LS质量比为2:1的B2组具有最高的抗压强度和最低的屈服应力。USL与LS的组合促进了水泥水化、钙矾石和单碳铝酸盐（Mc）的形成，以及C-S-H聚合度的增加。由于Mc的形成，USL与LS之间的协同作用细化了孔隙结构，弥补了火山灰反应对CH的消耗，从而在UHPC中提供了更致密的微观结构。UHPC的分形维数（Ds）与混凝土孔隙结构和抗压强度密切相关，这表明一种称为Ds值的新指标可用于评估UHPC的协同效应。
