摘要详情

ID / 提交时间

47 / 2022-03-28 15:43:45

标题

Utilization of Red Mud for Low-carbon Cementitious Material in Semi-flexible pavement (SFP)

关键字

Low-carbon cementitious material,Red mud,Strength,Semi-flexible pavement,Workability

主题及专题

废料混凝土

状态

全文待审

作者

Qianwen TAN / Harbin Institute of Technology

Chengsen YE / Harbin Institute of Technology

Dawei WANG / Harbin Institute of Technology；RWTH Aachen University

Ning XIE / University of Jinan

摘要

To solve the problem of industrial waste red mud piling up in large quantities and polluting the environment, and to achieve comprehensive utilization of red mud, energy saving and waste reduction. In this paper, Bayer red mud is used as the research object to prepare "red mud-cement" low-carbon cementitious material (RMLC) as the semi-flexible pavement (SFP) material. Based on the analysis of the raw material properties, the effects of the amount of red mud and water-cement ratio on the fluidity and strength of the RMLC were studied. SEM was used to analyze the microstructure of RMLC at different curing ages. And X-CT was used to analyze the groutability of RMLC. The results show that: the optimum amount of red mud in the RMLC is 10% and the optimum water-cement ratio is 0.42. The calcium alumina crystals are filled with unhydrated red mud particles, allowing the structure of the RMLC to be reinforced and RMLC to gain early strength. The grouting effect of RMLC is better than that of cement. This study can improve the workability of the RMLC and enable the RMLC to achieve the goal of early strength.