An influence of geothermal water, temperature and pressure on the hydration of multicomponent cement binders

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Geothermics Pub Date : 2024-09-07 DOI:10.1016/j.geothermics.2024.103156
Eva Kuzielová , Michal Slaný , Jan Koplík , Jiří Másilko , Oľga Fričová
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Abstract

Cement pastes of different compositions were hydrated in a geothermal solution with the simultaneous action of high temperature (150 °C) and pressure (18 MPa) for 7 days. The influence of solution on phase composition and compressive strength of pastes was investigated based on the comparison with hydration in water and using TGA, XRD, FTIR, 29Si, and 27Al NMR. The geothermal solution accelerated hydration and pozzolanic reactions. A higher amount of more thermally stable products was formed. Undesired transformation to crystalline α-C2SH in the samples with the highest C/S ratio was restricted. The uptake of carbonates from the solution led to an increased amount of calcite. As a result, increased compressive strength values were determined. Preferential incorporation of Al3+ into the structure of C-(A-)S-H or hydrogrossular phases depended on the composition of cement pastes.

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地热水、温度和压力对多组分水泥粘结剂水化的影响
不同成分的水泥浆在高温(150 °C)和高压(18 兆帕)同时作用的地热溶液中水化 7 天。根据与在水中水化的比较,并使用 TGA、XRD、傅立叶变换红外光谱、29Si 和 27Al NMR,研究了溶液对水泥浆相组成和抗压强度的影响。地热溶液加速了水化和胶凝反应。形成了更多热稳定性更高的产物。在 C/S 比最高的样品中,向结晶 α-C2SH 的意外转化受到了限制。从溶液中吸收碳酸盐增加了方解石的数量。因此,抗压强度值得以提高。Al3+ 在 C-(A-)S-H 或水毛细相结构中的优先结合取决于水泥浆的成分。
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来源期刊
Geothermics
Geothermics 工程技术-地球科学综合
CiteScore
7.70
自引率
15.40%
发文量
237
审稿时长
4.5 months
期刊介绍: Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.
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