不同钢渣掺量对UHPC性能的影响研究

钢渣作为大宗固体废弃物在建筑材料领域的应用是节能减排的重要途经之一。本文研究了不同钢渣掺量对UHPC工作性、力学性能及收缩性能的影响规律，并通过TG/DTG及SEM分析其水化机理。结果表明，随着钢渣掺量的增加，UHPC的流动度呈不同程度增加，早期抗压强度和抗折强度降低幅度较大，但后期力学性能差距逐渐减小。UHPC的自收缩性能随着钢渣掺量的增加呈降低趋势。钢渣粉掺量占总胶凝材料的18%时，制备的UHPC的工作性能和自收缩性能仍较为优异，水化28d后力学性能增长较快。

Influence of different content of steel slag on the properties of UHPC

The application of steel slag as a bulk solid waste in the field of building materials is an important way to save energy and reduce emissions. In this paper, the effects of different content of steel slag on the workability, mechanical properties and shrinkage of UHPC are studied, and the hydration mechanism is analyzed by TG/DTG and SEM. The results show that with the increase of steel slag content, the fluidity of UHPC increases in some degrees, the early compressive strength and flexural strength decreases significantly, but the gap in mechanical properties gradually decreases in the later stage. The self-shrinkage performance of UHPC shows a decreasing trend with the increase of steel slag content. When steel slag powder content accounts for 18% of the total cementitious materials, the UHPC still has good working and self-shrinking performance, and the mechanical properties increases rapidly after 28-days of hydration.