Work

Enabling superior thermo-mechanical performance of hydrated salt-based phase change energy storage cementitious composite using graphene oxide reinforced micro-interface

Year: 2023

Type: article

Abstract: Thermal energy storage cementitious composites (TESCCs) with encapsulated phase change materials (PCMs) were promising candidates for thermal comfort and energy saving in solar passive buildings . However, serious deterioration of mechanical properties and low heat transfer efficiency had hindered their application. In this study, a high-strength encapsulated PCM with a simple production process was developed by encapsulating eutectic hydrated salt PCM within UV-curable polyurethane acrelate resin, and the presented encapsulated PCM (UPE) was used to partially replace sand in cement mortar to prepare TESCC/UPE. Moreover, graphene oxide (GO) modification was conducted to form GO-TESCC/UPE, synergistically enhancing the mechanical strength and heat transfer efficiency. The compressive strength , microstructure and thermal conductivity of TESCCs were studied. Surface heat storage coefficient was presented to further assess the heat transfer and heat storage capacity of TESCCs. Moreover, GO-TESCC/UPE containing 20 vol% encapsulated PCM exhibited 28-day compressive strength of 35.3 MPa, with a 25% improvement over TESCC/UPE. The thermal conductivity and surface heat storage coefficient were also optimized by GO modification. The enhancement of thermal and mechanical properties can be attributed to the fact that GO-TESCC/UPE had a denser interface transition zone (ITZ) and lower harmful porosity due to the excellent compatibility between cement matrix and UPE. In addition, a simplified meso-mechanical model demonstrated that a denser ITZ can mitigate the stress concentration inside the matrix, thus enhancing mechanical properties of TESCCs. This study confirmed the effectiveness of reinforcing ITZ to enhance the thermo-mechanical properties of heat storage cementitious materials .

Source: Journal of Building Engineering

DOI: 10.1016/j.jobe.2023.107166

Authors: Minjie Jia, Kunyang Yu, Yushi Liu, Yingzi Yang

Institutions: Harbin Institute of Technology, Ministry of Industry and Information Technology

Language: English

Topic: Phase Change Materials Research

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure, Climate action

Open Access status: hybrid

Estimated APC paid: $3,050