Mechanical and Thermal Properties of Gypsum-Based Self-Leveling Mortar Incorporated with Brick Slag-Based Energy Storage Particles

doi:10.16552/j.cnki.issn1001-1625.2025.0702

Abstract

Abstract:

To promote the integrated development of solid waste resource utilization and building energy efficiency industry. This study prepared composite energy storage particles （ESPs） using paraffin wax and brick slag （BS）， and partially replaced sand with gypsum-based self-leveling mortar to prepare a new type of gypsum-based self-leveling phase change energy storage mortar （NGSESM）. The adsorption rate of BS and leakage rate of ESPs， as well as the microstructure， thermal properties， and mechanical properties of NGSESM were studied using mass change method， XRD， FT-IR， SEM， DSC， mechanical and thermal performance testing methods. Results show that various the adsorption conditions and particle size of BS affects the adsorption rate of BS and leakage rate of ESPs. The incorporation of ESPs significantly affects the morphology of gypsum crystals of adjacent regions， and deteriorates the mechanical properties of NGSESM. When ESPs substitute 75% （mass fraction） of sand， the mechanical properties and fluidity of NGSESM can meet the requirements of “Gypsum based self-leveling compound for floor” （JC/T 1023—2021）. In addition， the phase transition temperatures of NGSESM during heating and cooling processes are 17.2~27.3 ℃ and 14.9~22.4 ℃， with latent heating values of 4.1 and 4.3 J/g. This study provides key technical support for the application of energy-saving materials in solid waste based buildings.

Key words: brick slag, paraffin wax, flue gas desulphurized gypsum, gypsum-based self-leveling mortar, phase change material, solid waste utilization

CLC Number:

TU526

WANG Qingpei, LI Hui, ZHENG Wukui, YUAN Wenbin, CHANG Ning, ZHOU Zhou. Mechanical and Thermal Properties of Gypsum-Based Self-Leveling Mortar Incorporated with Brick Slag-Based Energy Storage Particles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(1): 212-226.

Figures/Tables 20

Fig.1 SEM image of BS

Fig.2 Particle size distribution of HG

Table 1 Main chemical composition of HG

Composition	SO₃	CaO	Al₂O₃	Fe₂O₃	MgO	SiO₂	Other
Mass fraction/%	57.64	39.78	0.09	0.05	0.55	0.27	1.62

Fig.3 Process of BS preparing from waste clay bricks

Fig.4 Schematic diagram of preparing ESPs

Table 2 Mix proportion design of NGSESM

Sample	Substitution rate of ESPs （mass fraction）/%	Mass/g
Sample	Substitution rate of ESPs （mass fraction）/%	ESPs	Sand	HG	WR	HPMC	SC	Water
1	0	0	200	800	2.5	1.0	1.0	480
2	25	50	150	800	2.5	1.0	1.0	480
3	50	100	100	800	2.5	1.0	1.0	480
4	75	150	50	800	2.5	1.0	1.0	480
5	100	200	0	800	2.5	1.0	1.0	480

Fig.5 Adsorption rate of BS and leakage rate of ESPs before and after cleaning under HP， SA， and NP conditions

Fig.6 Adsorption rate of BS and leakage rate of ESPs under different NP conditions

Fig.7 Influence of BS particle size on adsorption rate of BS， leakage rate of ESPs， and schematic diagram of evolution mechanism of BS pore structure

Fig.8 Fluidity of NGSESM with different substitution rates of ESPs

Fig.9 Particle morphology of sand and BS

Fig.10 Mechanical properties of NGSESM with different substitution rates of ESPs

Fig.11 Schematic diagrams of force distribution during mechanical properties tests for NGSESM

Fig.12 Thermal conductivity of NGSESM with different substitution rates of ESPs

Fig.13 XRD patterns of NGSESM and its constituent materials

Fig.14 FT-IR spectra of NGSESM and its constituent materials

Fig.15 Microstructure before and after BS adsorb PW

Fig.16 Microstructure of NGSESM without ESPs and with 75% ESPs

Fig.17 Thermal properties of ordinary gypsum-based self-leveling mortar and NGSESM

Fig.18 Schematic diagram of storage-release

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