钙硅比对铝硅酸盐凝胶形成与特性的影响

doi:10.11896/cldb.19070122

材料导报

2020, Vol. 34

Issue (12): 12057-12063 https://doi.org/10.11896/cldb.19070122

无机非金属及其复合材料

钙硅比对铝硅酸盐凝胶形成与特性的影响

覃丽芳, 曲波, 史才军, 张祖华

湖南大学土木工程学院,绿色先进土木工程材料及应用技术湖南省重点实验室,长沙 410082

Effect of Ca/Si Ratio on the Formation and Characteristics of Synthetic Aluminosilicate Hydrate Gels

QIN Lifang, QU Bo, SHI Caijun, ZHANG Zuhua

Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China

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摘要碱激发胶凝材料的主要凝胶产物可分为水化硅铝酸钙凝胶(C-A-S-H)和铝硅酸钠凝胶(N-A-S-H)两种,这两种凝胶产物的形成条件与特性尚不十分清楚。本工作利用溶胶-凝胶法合成了与上述水化产物具有类似结构特性的铝硅酸盐凝胶,研究了钙硅比(Ca/Si)的变化对铝硅酸盐凝胶形成与特性的影响。通过X射线衍射(XRD)、傅里叶转换红外光谱(FTIR)、热重-差示扫描量热(TG-DSC)以及透射电镜-能谱(TEM-EDX)等测试技术对不同Ca/Si条件下合成凝胶的物相组成、特征化学结构基团、热稳定性及微观结构进行了分析。结果发现,当Ca/Si＜0.6时,N-A-S-H凝胶与C-A-S-H凝胶共存;Ca/Si≥0.6时,只生成C-A-S-H 凝胶。当Ca/Si＜1.4时,随钙硅比增大反应产物中低聚合度的结构单元及C-A-S-H凝胶的含量增加,同时三维网络结构中高聚合度的结构单元含量降低;Ca/Si≥1.4时,体系形成富硅凝胶。随着体系中Ca/Si的提高,反应产物由生成无定形的N-A-S-H凝胶向生成结构相对有序的C-A-S-H凝胶转变。此研究结果为碱激发胶凝材料的组成设计提供了理论依据。

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关键词: N-A-S-H凝胶 C-A-S-H凝胶钙硅比微观结构

Abstract: There are two types of reaction products for alkali-activated binders. One is an aluminum-substituted calcium silicate hydrates (C-A-S-H), and the other is a highly disordered aluminosilicate gel (N-A-S-H). However, the factors that influence the precipitation mechanism for gels have been not yet well understood. This paper reports a research on the effect of Ca/Si on the formation and properties of synthetic aluminosilicate hydrate gels as models for the gels arising in alkali-activated binders. X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC) and transmission electron microscopy-energy-dispersive X-ray (TEM-EDX) were used to characterize the synthesized gels with various Ca/Si. The results obtained show that N-A-S-H gels coexisted with C-A-S-H gel at Ca/Si<0.6. When Ca/Si≥0.6, only C-A-S-H gel formed. When Ca/Si<1.4, calcium increased the content of C-A-S-H gel phase of low degree of polymerization, and reduced the structural units with high degree of polymerization. In the case of Ca/Si≥1.4, the system form silicon-rich gel rather than more C-A-S-H gel formation. The increase of Ca/Si favored in the formation of C-A-S-H instead of the highly disordered N-A-S-H gel. The results obtained in this study could provide certain theoretical basis and experimental basis for the design of the alkali-activated binder systems.

Key words: N-A-S-H gel C-A-S-H gel molar ratio of calcium to silicon microstructure

发布日期: 2020-05-29

ZTFLH:

TQ172

基金资助: 国家自然科学基金 (51638008;51878263)

通讯作者: mcshi@hnu.edu.cn

作者简介: 覃丽芳,2016年6月毕业于广西大学,获得工学学士学位。现为湖南大学土木工程学院硕士研究生,在史才军教授的指导下进行研究。目前主要研究领域为碱激发胶凝材料水化产物结构特性。
史才军,国家第二批“千人计划”特聘专家、湖南省特聘专家、亚洲混凝土联合会副主席、湖南大学985工程创新平台首席科学家、特聘教授、博士生导师,Taylor and Francis 学术期刊 Journal of Sustainable Cement-based Materials创刊主编, Journal of Ceramics in Modern Technologies 共同主编、中国硅酸盐学会会刊《硅酸盐学报》副主编,Elsevier著名学术期刊 Cement and Concrete Research和 Cement and Concrete Composites、 Construction and Building Materials、Taylor & Francis学术期刊 Journal of Structural Integrity and Maintenance、西班牙 Materiales de Construccion、《材料导报》《建筑材料学报》《重庆交通大学学报》及《中国水泥》等期刊编委。在水泥和混凝土材料的设计、测试、耐久性、智能防渗漏材料及废物的利用和处置方面做了广泛深入的研究工作,发表高水平学术论文300余篇。出版英文著作7部,中文著作3部,合编国际会议英文论文集6本。2014年获湖南省“潇湘友谊”奖。2015—2017年“建设与建造”领域中国高被引学者,2016年全球土木工程领域高被引学者,2001、2007和2016年分别当选为国际能源研究会、美国混凝土学会及国际材料与结构联合会的会士(Fellow)。

引用本文:

覃丽芳, 曲波, 史才军, 张祖华. 钙硅比对铝硅酸盐凝胶形成与特性的影响[J]. 材料导报, 2020, 34(12): 12057-12063.
QIN Lifang, QU Bo, SHI Caijun, ZHANG Zuhua. Effect of Ca/Si Ratio on the Formation and Characteristics of Synthetic Aluminosilicate Hydrate Gels. Materials Reports, 2020, 34(12): 12057-12063.

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http://www.mater-rep.com/CN/10.11896/cldb.19070122 或 http://www.mater-rep.com/CN/Y2020/V34/I12/12057

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