Hydration characteristics of intermediate-calcium based cementitious materials from red mud and coal gangue

被引：0

作者：

Zhang, Na ^{[1
]}

Liu, Xiaoming ^{[2
]}

Sun, Henghu ^{[1
,3
]}

机构：

[1] Green Construction Materials and Circulation Economy Center, Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084, China

[2] School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

[3] Pacific Resources Research Center, University of the Pacific, Stockton, CA 95211, United States

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2014年 / 28卷 / 05期

关键词：

Cementitious materials - Coal gangues - Hydration characteristics - Hydration process - Hydration products - Inorganic non-metallic materials - Polymerization degree - Red mud;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In order to deep understand the hydration characteristics of red mud-coal gangue based intermediate-calcium cementitious materials, XRD, IR, TG-DTA and MIP techniques were used to investigate the hydration products and pore structure of the hardened pastes, which formed after a hydration process of the red mud- coal gangue based intermediate-calcium cementitious materials. The results show that the hydration products mainly are C-S-H gel, ettringite and calcium hydroxide. As the dominant products, C-S-H gel and ettringite are principally responsible for the strengthening of the intermediate-calcium cementitious materials. By hydration for 1 d to 90 d, the content of calcium hydroxide increases at the initial stage and later decreases. With the progress of hydration process, the polymerization between Si-OH bonds tends to be easier, resulting in an increasing of polymerization degree of the hydration products. The red mud-coal gangue based intermediate-calcium cementitious materials with CaO/SiO2 ratios of 0.95 and 1.04 possess good pore structure of the hardened pastes, while the pore structure of the hardened paste for the material with CaO/SiO2 ratio of 1.13 is relatively poor. © Copyright.

引用

页码：325 / 332