赤泥-煤矸石基中钙体系胶凝材料的水化特性*

doi:10.11901/1005.3093.2013.777

材料研究学报

2014, Vol. 28

Issue (5): 325-332 DOI: 10.11901/1005.3093.2013.777

本期目录 | 过刊浏览

赤泥-煤矸石基中钙体系胶凝材料的水化特性*

张娜¹,刘晓明²(

),孙恒虎^1,³

1. 清华大学建筑设计研究院有限公司绿色建材与循环经济研究中心北京 100084
2. 北京科技大学冶金与生态工程学院北京 100083
3. 美国太平洋大学太平洋资源研究中心加利福尼亚州 95211

Hydration Characteristics of Intermediate-Calcium Based Cementitious Materials from Red Mud and Coal Gangue

Na ZHANG¹,Xiaoming LIU^2,^**(

),Henghu SUN^1,³

1. Green Construction Materials and Circulation Economy Center, Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083
3. Pacific Resources Research Center, University of the Pacific, Stockton, CA 95211, USA

引用本文:

张娜,刘晓明,孙恒虎. 赤泥-煤矸石基中钙体系胶凝材料的水化特性*[J]. 材料研究学报, 2014, 28(5): 325-332.
Na ZHANG, Xiaoming LIU, Henghu SUN. Hydration Characteristics of Intermediate-Calcium Based Cementitious Materials from Red Mud and Coal Gangue[J]. Chinese Journal of Materials Research, 2014, 28(5): 325-332.

全文: PDF(2050 KB) HTML

摘要:

采用XRD、IR、TG-DTA、MIP等手段表征赤泥-煤矸石基中钙体系胶凝材料的水化产物及其硬化浆体的孔结构, 研究了解赤泥-煤矸石基中钙体系胶凝材料的水化特性。结果表明, 赤泥-煤矸石基中钙体系胶凝材料的水化产物主要有C-S-H凝胶、钙矾石和Ca(OH)₂, 前两者对其强度的发展有促进作用; 水化1 d至90 d其中Ca(OH)₂的含量呈先升高后降低的趋势; 随着水化反应的进行在CaO/SiO₂比值较低的赤泥-煤矸石基中钙体系胶凝材料中Si-OH基团之间发生聚合反应, 水化产物的聚合度升高; CaO/SiO₂比值为0.95和1.04的赤泥-煤矸石基中钙体系胶凝材料的硬化浆体具有较好的孔结构, 而CaO/SiO₂比值为1.13的胶凝材料硬化浆体的孔结构相对较差。

关键词 ：无机非金属材料, 中钙体系胶凝材料, 微观结构, 赤泥, 煤矸石, 水化

Abstract：

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/SiO₂ratio of 1.13 is relatively poor.

Key words： inorganic nonmetallic materials intermediate-calcium based cementitious materials microstructure red mud coal gangue hydration

收稿日期: 2013-10-18

基金资助:* 国家自然科学基金51302012和北京市科技专项-首都设计提升计划Z131110000213046。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.777 或 https://www.cjmr.org/CN/Y2014/V28/I5/325

表1 原料的化学组成 (质量分数/%)

表2 赤泥-煤矸石基中钙体系胶凝材料的物料配比(质量分数/ %)

表3 赤泥-煤矸石基中钙体系胶凝材料的化学组成(质量分数/ %)

图1 胶凝材料水化3 d硬化浆体的XRD谱图

图2 胶凝材料水化90 d硬化浆体的XRD谱图

图3 O试样不同水化龄期硬化浆体的IR谱图

图4 A试样不同水化龄期硬化浆体的IR谱图

图5 B试样不同水化龄期硬化浆体的IR谱图

图6 O、A、B试样3 d水化产物中波数位于4000 cm-1~3000 cm-1的IR谱图

图7 O、A、B试样90 d水化产物中波数位于4000 cm-1~3000 cm-1的IR谱图

图8 O试样28 d硬化浆体的TG-DTA曲线

图9 A试样28 d硬化浆体的TG-DTA曲线

图10 B试样28 d硬化浆体的TG-DTA曲线

图11 O、A、B试样不同龄期C-S-H凝胶和AFt的质量损失

图12 O、A、B试样不同龄期Ca(OH)2的质量损失

表4 O、A、B试样水化90 d硬化浆体的孔结构

图13 不同水化龄期硬化浆体的平均孔径

图14 不同水化龄期硬化浆体的最可几孔径

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