高性能保温混凝土的性能与微观结构分布

Properties and Microstructure Distribution of High-Performance Thermal Insulation Concrete.

作者信息

Mohammad Malek, Masad Eyad, Seers Thomas, Al-Ghamdi Sami G

机构信息

Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha 34110, Qatar.

Mechanical Engineering Program, Texas A&M University at Qatar, Doha 23874, Qatar.

出版信息

Materials (Basel). 2020 May 1;13(9):2091. doi: 10.3390/ma13092091.

DOI:10.3390/ma13092091

PMID:32369971

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7254280/

Abstract

The aim of this experimental study is to develop high strength and lightweight concrete mixture suitable for structural applications. This work investigates the effect of replacing normal aggregate either partially or totally with expanded perlite aggregate. This material allows for better thermal insulation properties, thus decreasing the energy usage within the life cycle of the concrete structure. Expanded perlite aggregate was used in concrete by 20%, 40%, 60%, 80%, and 100% in replacement of the natural aggregate. Material characterization tests of compressive strength, flexural strength, and thermal conductivity were carried out for six concrete mixtures. In addition, microstructure analysis was performed with the aid of a micro-computed tomography system to investigate the effects and relation of microstructure quantities on material properties. The proposed concrete mixture, which has 100% of expanded perlite aggregate, has a unit weight of 1703 kg/m and achieved reduction percentage of thermal conductivity around 62% (1.81 to 0.69 W·m·K) and a compressive strength of 42 MPa at 28 days; and thus is ideal for structural applications with enhanced properties.

摘要

本实验研究的目的是开发适用于结构应用的高强度轻质混凝土混合物。这项工作研究了用膨胀珍珠岩骨料部分或全部替代普通骨料的效果。这种材料具有更好的隔热性能，从而降低了混凝土结构生命周期内的能源消耗。膨胀珍珠岩骨料在混凝土中的用量分别为20%、40%、60%、80%和100%，以替代天然骨料。对六种混凝土混合物进行了抗压强度、抗弯强度和导热系数的材料特性测试。此外，借助微计算机断层扫描系统进行微观结构分析，以研究微观结构数量对材料性能的影响及关系。所提出的含有100%膨胀珍珠岩骨料的混凝土混合物，单位重量为1703 kg/m，导热系数降低百分比约为62%（从1.81降至0.69 W·m·K），28天时抗压强度为42 MPa；因此是具有增强性能的结构应用的理想选择。