Study on the effect of iron tailings manufactured sand powder content on cement Hydration

International Conference on Manufacturing Technology, Materials and Chemical Engineering

材料科学;化学工业

Guo, Jun-Hua^1 ; Li, Gong-Zhou^2 ; C.-Y., Gao

China Building Materials Academy, No.1 Guan Zhuang Dong Li, Chaoyang District, Beijing, China^1

Beijing China Coal Mine Engineering Co., Ltd, No.5 Qing Nian Gou Road, Heping Li, Chaoyang District, Beijing, China^2

关键词: Calcium silicate hydrate;    Cement hydration;    Cementitious materials;    Composite cementitious materials;    Hardened paste;    Hydration products;    Manufactured sand;    Stone powders;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/592/1/012006/pdf
DOI  :  10.1088/1757-899X/592/1/012006

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper, the effects of different stone powder content (5%, 10%, 15%, 20%, 25%) of iron tailings manufactured sand on the workability and mechanical properties of cement were studied. The results show that the strength of hardened paste can be improved by adding appropriate amount of stone powder. When the content of stone powder is 5%, The compressive strength reached 34.4MPa. The results of XRD show that the hydration products of cementitious materials mixed with stone powder are mainly ettringite, Ca(OH)2, hydro calcium, calcium silicate hydrate and quartz. The results of SEM show that proper amount of stone powder can effectively improve the porosity of composite cementitious materials, but the content of stone powder increases, the bond between stone powder and hydration products is not close enough, and the paste structure becomes loose.