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纳米钛对封装宏观 PCM 的结构混凝土的腐蚀和热性能的作用研究。

Investigation of the Role of Nano-Titanium on Corrosion and Thermal Performance of Structural Concrete with Macro-Encapsulated PCM.

机构信息

School of Architecture and Built Environment, the University of Newcastle, Callaghan, NSW 2308, Australia.

ARC Centre of Excellence for Geotechnical Science and Engineering, the University of Newcastle, Callaghan, NSW 2308, Australia.

出版信息

Molecules. 2019 Apr 6;24(7):1360. doi: 10.3390/molecules24071360.

DOI:10.3390/molecules24071360
PMID:30959919
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6480483/
Abstract

The present study aims to investigate the impact of thermal energy storage aggregate (TESA) and nano-titanium (NT) on properties of structural concrete. TESA was made of scoria encapsulated with phase change materials (PCMs). Coarse aggregates were replaced by TESA at 100% by volume of aggregate and NT was added at 5% by weight of cement. Compressive strength, probability of corrosion, thermal performance, and microstructure properties were studied. The results indicated that the presence of TESA reduced the compressive strength of concrete, although the strength was still high enough to be used as structural concrete. The use of TESA significantly improved the thermal performance of concrete, and slightly improved the resistance of corrosion in concrete. The thermal test results showed that TESA concrete reduces the peak temperature by 2 °C compared to the control. The addition of NT changed the microstructure of concrete, which resulted in higher compressive strength. Additionally, the use of NT further enhanced the thermal performance of TESA concrete by reducing the probability of corrosion remarkably. These results confirmed the crucial role of NT in improving the permeability and the thermal conductivity of mixtures containing PCM. In other words, the charging and discharging of TESA was enhanced with the presence of NT in the mixture.

摘要

本研究旨在探讨热能存储骨料（TESA）和纳米钛（NT）对结构混凝土性能的影响。TESA 由包裹相变材料（PCM）的浮石制成。粗骨料用 TESA 替代，替代体积为骨料的 100%，同时添加 5%的水泥重量的 NT。研究了抗压强度、腐蚀概率、热性能和微观结构性能。结果表明，TESA 的存在降低了混凝土的抗压强度，尽管强度仍然足以用作结构混凝土。TESA 的使用显著提高了混凝土的热性能，略微提高了混凝土的抗腐蚀能力。热测试结果表明，与对照相比，TESA 混凝土将峰值温度降低了 2°C。NT 的添加改变了混凝土的微观结构，从而提高了抗压强度。此外，NT 的使用通过显著降低腐蚀概率进一步提高了 TESA 混凝土的热性能。这些结果证实了 NT 在提高含 PCM 混合物的渗透性和导热性方面的关键作用。换句话说，在混合物中加入 NT 可以增强 TESA 的充放电能力。

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