Study on High-Temperature Activated Products and Hydration Properties of Aga Soil in Tibet for Cement Concrete.

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2024-11-01 DOI:10.3390/ma17215364

Lihui Li, Kaiming Niu, Jianrui Ji, Panpan Zhang, Jilin Zhang

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Abstract

In order to impart the properties of cementitious material to the Tibetan Agar soil, two high-temperature activation mechanisms (HTMA, HTMB) were designed in this study, and the products and hydration-hardening properties of Tibetan Agar soil high-temperature activation mechanism were analyzed by means of SEM, XRD, and XRF. The results show that the main components of Tibetan Aga soil are calcite and quartz; Aga soil is activated by HTMA high-temperature activation, forming the main products of CaO, C₂S, CaSiO₃, and CaAl₂Si₂O₈, and its products have both air-hardening and water-hardening characteristics; Aga soil is activated by HTMB high-temperature activation, and when the temperature reaches 1250 °C when the clinker is not found in the CaO, the generation of C₂S, C₃S, C₃A, C₄AF, and Mg₂SiO₄ minerals with good water-hardening cementitious properties occurs when the temperature rises to 1350 °C, although the formation of some inert minerals that do not have the cementitious properties, but this temperature activation products of the thermodynamic properties of the best; Enhancing the value of lime saturation degree (KH) and silicon rate (SM) can promote the formation of the products of the C₂S and C₃S, increase the reactivity of the Aga soil activation products, and increase the hydration heat as well as compressive and flexural strength, combined with the results of the hydration heat and mechanical test, KH is recommended to be 0.9~0.94, SM is recommended to be 1.8~2.4, and alumina ratio (IM) is recommended to be 1.8~2.4 when Aga soil is used with raw materials.

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西藏水泥混凝土用阿嘎土高温活化产物及水化性能研究

为了赋予西藏阿嘎土胶凝材料的性质，本研究设计了两种高温活化机理（HTMA、HTMB），并通过扫描电镜、X射线衍射和X射线荧光光谱分析了西藏阿嘎土高温活化机理的产物和水化硬化性质。结果表明，西藏阿嘎土的主要成分为方解石和石英；阿嘎土经 HTMA 高温活化，形成的主要产物为 CaO、C2S、CaSiO3 和 CaAl2Si2O8，其产物同时具有气硬和水硬特性；阿嘎土经HTMB高温活化，当温度达到1250℃时熟料中不存在CaO，生成C2S、C3S、C3A、C4AF和Mg2SiO4等具有良好水硬胶凝特性的矿物，当温度升至1350℃时，虽然形成一些不具有胶凝特性的惰性矿物，但这种温度活化产物的热力学性质最好；提高石灰饱和度（KH）和硅率（SM）值可促进C2S和C3S产物的形成，提高阿嘎土活化产物的反应活性，增加水化热以及抗压、抗折强度，结合水化热和力学试验结果，建议KH为0.9~0.94，SM 建议为 1.8~2.4，氧化铝比（IM）建议为 1.8~2.4。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.