Mechanism and preparation of liquid alkali-free liquid setting accelerator for shotcrete

17th IUMRS International Conference in Asia

Qiu, Ying^1 ; Ding, Bei^1 ; Gan, Jiezhong^1 ; Guo, Zhaolai^1 ; Zheng, Chunyang^1 ; Jiang, Haidong^1

Jiangsu China Railway ARIT New Materials Co. Ltd., Nanjing

211505, China^1

关键词: Alcohol amine;    Characterization methods;    Compressive strength ratios;    High penetrations;    Hydration of cements;    Initial setting time;    Setting time;    Temperature drops;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012034/pdf
DOI  :  10.1088/1757-899X/182/1/012034

来源: IOP

【 摘 要 】

A new alkali-free liquid accelerator for shotcrete was prepared through normal temperature drop process by using the nano activated alumina and the modified alcohol amine as the main raw materials. The effect of alkali-free liquid accelerator on the cement setting time and the mechanical properties of mortar, the effect of the penetration strength on the shotcrete rebound were investigated. And the accelerating mechanism of the as-prepared alkali-free liquid accelerator was also analyzed via XRD and SEM characterization methods. The experimental results indicated that the hydration of C3A was accelerated by the polyamine complexation of accelerator, resulting in forming a large number of acicular ettringite and reducing the amount of Ca(OH)2 crystal, which would not affect the later hydration of cement. When the content of alkali-free liquid accelerator was 6%, the initial setting time and final setting time were less than 3min and 8min respectively, and 1d and 28d compressive strength ratios reached 207.6% and 114.2% respectively; beside that, the shotcrete rebound was very low because of the high penetration strength within 30min.