A Low-Carbon Composite Cementitious Material Manufactured by a Combined Process of Red Mud

材料科学 胶凝的 复合数 多孔性 复合材料 碳纤维 微观结构 抗压强度 赤泥 灰浆 抗弯强度 水泥 冶金
作者
Zhen‐Guo Zhao,Fufei Wu,Shuangkuai Dong,Qiuyue Zhang,Chuanteng Huang,Liangliang Chen
出处
期刊:Buildings [Multidisciplinary Digital Publishing Institute]
卷期号:14 (6): 1729-1729
标识
DOI:10.3390/buildings14061729
摘要

In present study, the effects of varying dosages of combined red mud on the microstructure and hydration process of low-carbon composite cementitious material. The findings indicated a gradual decrease in the reactivity of RM, following a linear trend. The non-evaporable water content of the composite binder exhibited an initial increase followed by a subsequent decrease, with the optimal content identified at 10%, for RM content ranging from 10% to 90%, non-evaporable water decreases linearly. Optimal bending strength and compressive strength were achieved in the mortar when incorporating 10% of RM, reaching 8.56 MPa and 51.2 MPa at 28 days, respectively. The porosity was at its lowest when the RM content was added at 10%, but further increasing RM dosage was reversed. The pore size distribution aligned with the experimental findings on porosity. X-ray diffraction (XRD) analysis revealed the involvement of RM in the secondary hydration reaction, thereby enhancing the mechanical properties of low-carbon composite cementitious material. The optimal content of RM is suggested to be 10%, with a maximum recommended limit of 30%. The analysis has shown that red mud particles serve a dual purpose in low-carbon composite cementitious material. They enhance compactness by acting as fillers and promote cement hydration through surface activity, thereby enhancing mechanical properties, durability, and pore size distribution.
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