钙矾石
水泥
铝酸盐
抗压强度
材料科学
高效减水剂
扫描电子显微镜
灰浆
复合材料
碱金属
硫酸盐
石膏
硅酸盐水泥
冶金
化学
有机化学
作者
Jianbing Zhang,Rongjin Liu,Siyuan Fu,Tianyu Gao,Zhongfei Zhang
出处
期刊:Journal of Renewable Materials
[Computers, Materials and Continua (Tech Science Press)]
日期:2021-01-01
卷期号:9 (11): 2001-2013
被引量:6
标识
DOI:10.32604/jrm.2021.015812
摘要
Based on aluminum sulfate, a fluorine-free and alkali-free liquid accelerator (FF-AF-A) was prepared in this study.The setting time and compressive strength of three cement types with different FF-AF-A dosages were fully investigated.The compatibility of the FF-AF-A with the superplasticizers were also investigated, and the early hydration behavior and morphology of the hydration products of reference cement paste with the FF-AF-A were explored by hydration heat, X-ray diffractometry (XRD), and scanning electron microscopy (SEM).Test results indicated that adding the FF-AF-A at 8 wt% of the cement weight resulted in 2 min 35 s initial setting time and 6 min 30 s final setting time.The 1-day compressive strength of the cement mortar with 8 wt% of FF-AF-A reached 13.5 MPa, which represents an increase of 35% as compared to the strength of cement mortar without the FF-AF-A, and the 28-day compressive strength ratio was 119%.In addition, the FF-AF-A also showed good compatibility with different superplasticizer dosages.The results show that, when the FF-AF-A was added to the cement paste, it promoted the formation of ettringite crystals due to the aluminum ions (Al 3+ ) and sulfate ions (SO 4 2-) reacted with gypsum in the cement, as well as promoted the hydration of tricalcium aluminate (C 3 A) and tricalcium silicate (C 3 S) leading to the overall structure becomes more compact.As a consequence, the hydration heat rate of the cement sharply increased, the cement paste setting time is shortened, and the compressive strength of cement mortar is improved.
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