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含有相变材料和纳米二氧化硅的复合水泥浆体的力学性能与耐久性

Mechanical Properties and Durability of Composite Cement Pastes Containing Phase-Change Materials and Nanosilica.

作者信息

Ziga-Carbarín Javier, Gómez-Zamorano Lauren Y, Cruz-López Arquímedes, Pushpan Soorya, Vázquez-Rodríguez Sofía, Balonis Magdalena

机构信息

Programa Doctoral en Ingeniería de Materiales, Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Ave. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico.

Departamento de Tecnología del Concreto, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, Ave. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico.

出版信息

Materials (Basel). 2024 Jul 2;17(13):3271. doi: 10.3390/ma17133271.

DOI:10.3390/ma17133271
PMID:38998352
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11243073/
Abstract

Escalating global surface temperatures are highlighting the urgent need for energy-saving solutions. Phase-change materials (PCMs) have emerged as a promising avenue for enhancing thermal comfort in the construction sector. This study assessed the impact of incorporating PCMs ranging from 1% to 10% by mass into composite Portland cement partially replaced by fly ash (FA) and nanosilica particles (NS). Mechanical and electrochemical techniques were utilized to evaluate composite cements. The results indicate that the presence of PCMs delayed cement hydration, acting as a filler without chemically interacting within the composite. The combination of FA and PCMs reduced compressive strength at early ages, while thermal conductivity decreased after 90 days due to the melting point and the latent heat of PCMs. Samples with FA and NS showed a significant reduction in the CO penetration, attributed to their pozzolanic and microfiller effects, as well as reduced water absorption due to the non-absorptive nature of PCMs. Nitrogen physisorption confirmed structural changes in the cement matrix. Additionally, electrical resistivity and thermal behavior assessments revealed that PCM-containing samples could reduce temperatures by an average of 4 °C. This suggested that PCMs could be a viable alternative for materials with thermal insulation capacity, thereby contributing to energy efficiency in the construction sector.

摘要

全球地表温度不断上升，凸显了对节能解决方案的迫切需求。相变材料（PCM）已成为提高建筑领域热舒适度的一条有前景的途径。本研究评估了将质量分数为1%至10%的PCM掺入部分由粉煤灰（FA）和纳米二氧化硅颗粒（NS）替代的复合硅酸盐水泥中的影响。采用力学和电化学技术对复合水泥进行评估。结果表明，PCM的存在延迟了水泥水化，在复合材料中起到了填充作用，且未发生化学相互作用。FA和PCM的组合降低了早期抗压强度，而由于PCM的熔点和潜热，90天后热导率降低。含有FA和NS的样品的二氧化碳渗透率显著降低，这归因于它们的火山灰效应和微填充效应，以及由于PCM的非吸收性而导致的吸水率降低。氮气物理吸附证实了水泥基体的结构变化。此外，电阻率和热行为评估表明，含PCM的样品平均可使温度降低4℃。这表明PCM可能是具有保温能力材料的可行替代品，从而有助于提高建筑领域的能源效率。

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