Relationship between Thermal Conductivity and Compressive Strength of Insulation Concrete: A Review

Chao  Wu; Shaoqing  Liu; Jianping  Guo; Hongqiang  Ma; Li He

doi:10.6000/1929-5995.2023.12.08

Authors

Chao Wu School of Transportation Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, China and Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
Shaoqing Liu School of Transportation Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, China and State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China
Jianping Guo State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China
Hongqiang Ma College of Civil Engineering and Architecture, Hebei University, Baoding, 071002, China and Technology Innovation Center for Testing and Evaluation in Civil Engineering of Hebei Province, Hebei University, Baoding, 071002, China
Li He School of Ecology and Environment, Beijing Technology and Business University, 33 Fucheng Road, Beijing 100048, China

DOI:

https://doi.org/10.6000/1929-5995.2023.12.08

Keywords:

Foaming, lightweight aggregates, thermal conductivity, compressive strength, concrete

Abstract

Developing insulation concrete with high strength is essential for the construction of energy saving buildings. This is important to achieve carbon neutrality in the modern building industry. This paper reviews the existing studies in the literature on insulation concrete. This paper aims to reveal the correlation between the thermal conductivity and strength of concrete and identify the most effective method to make insulation concrete with lower thermal conductivity but higher strength. The review is carried out from two perspectives, including the effects of different foaming methods and various lightweight aggregates. As for the foaming methods, the chemical and mechanical foaming methods are discussed. As for the lightweight aggregates, cenospheres, porous aggregates, aerogels, and phase change materials are assessed. It is clearly observed that the thermal conductivity and compressive strength of concrete can be fitted by a linear function. As for the foaming methods, chemical foaming using hydrogen peroxide is the most effective to produce concrete with relatively lower thermal conductivity and higher compressive strength. For concrete with lightweight aggregates, cenospheres are the best option. Finally, recommendations are made to develop concrete with lower thermal conductivity and higher strength.

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