CaCl2·6H2O/SiO2气凝胶复合相变泡沫混凝土的制备及性能

doi:10.19964/j.issn.1006-4990.2025-0103

Abstract

Abstract:

Phase change concrete materials are widely used in the field of building insulation and building energy conservation.CaCl₂·6H₂O/SiO₂ aerogel composite phase change materials were prepared by physical mixing method with SiO₂ aerogel as carrier，CaCl₂·6H₂O as phase change material and SrCl₂·6H₂O as nucleating agent.The thermal storage and insulation properties and thermal reliability of the composite phase change materials were evaluated.The CaCl₂·6H₂O/SiO₂ aerogel composite phase change foam concrete was prepared by mixing silicate cement，foaming agent，thickener，water reducing agent，composite phase change material and water according to a certain mixing ratio.The effects of CaCl₂·6H₂O/SiO₂ aerogel doping amount on the mechanical properties and heat storage and heat resistance properties of composite phase change foam concrete were analyzed.The results showed that compared with CaCl₂·6H₂O phase change material，CaCl₂·6H₂O/SiO₂ aerogel composite phase change material exhibited excellent heat storage and insulation performance and thermal reliability.When the mass fraction of CaCl₂·6H₂O was 70%，the CaCl₂·6H₂O/SiO₂ aerogel composite phase change material did not leak.The thermal conductivity，phase change temperature，phase change enthalpy and supercooling degree were 0.095 8 W/（m·K），27.32 ℃，113.5 J/g and 1.5 ℃，respectively.The CaCl₂·6H₂O/SiO₂ aerogel composite phase change material had little change in phase change temperature and phase change enthalpy after 100 thermal cycles，and the supercooling degree was reduced from 1.5 ℃ to 0.7 ℃，which had excellent thermal reliability.When the doping amount of CaCl₂·6H₂O/SiO₂ aerogel was 20%，the phase change temperature and enthalpy of phase change foam concrete were 21.68 ℃ and 32.3 J/g，respectively.The thermal conductivity，specific heat capacity，heat storage coefficient and thermal inertia were 9.17%，69.98%，52.05% and 35.70% higher than those of ordinary foam concrete，respectively.Compared with ordinary foam concrete，phase change foam concrete had good heat storage，heat resistance and thermal conductivity.The research provided a new idea for the development of thermal insulation concrete.

Key words: CaCl₂·6H₂O, SiO₂ aerogel, phase change materials, foam concrete, heat storage and insulation

CLC Number:

TQ132.32

CHEN Jing. Preparation and properties of CaCl₂·6H₂O/SiO₂ aerogel composite phase change foam concrete[J]. Inorganic Chemicals Industry, 2026, 58(3): 49-57.

Figures/Tables 18

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w（相变材料）/%	m（硅酸盐水泥）/g	m（相变材料）/g	m（水）/ g	m（泡沫）/ g	m（增稠剂）/g	m（减水剂）/g
0	2 200	0	770	250	15.3	22.1
4	2 024	88	1142	250	22.6	21.0
8	1 936	176	1175	250	23.3	20.1
12	1 870	264	1220	250	24.5	19.6
16	1 848	352	1255	250	25.3	18.4
20	1 760	440	1304	250	26.2	17.7

w（CaCl₂·6H₂O）/%	T_m/℃	ΔH_m/（J·g^-1）
100	29.94	150.1
90	29.23	115.4
80	28.78	105.2
70	27.32	113.5
60	29.63	74.2

材料	T_m/℃	ΔH_m/（J·g^-1）
聚乙二醇/粉煤灰^［23］	56.51	57.0
癸酸-十六醇/SiO₂气凝胶^［24］	19.20	91.3
甲基丙烯酸甲酯聚合物/聚乙二醇/碳纳米管^［25］	16.48	58.8
交联聚氨酯^［26］	39.90	56.6
CaCl₂·6H₂O/SiO₂气凝胶	27.32	113.5

w（CaCl₂·6H₂O/SiO₂ 气凝胶）/%	T_m/℃	ΔH_m/（J·g^-1）
4	12.13	11.4
8	14.98	11.6
12	17.14	11.9
16	18.97	29.1
20	21.68	32.3

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation and properties of CaCl₂·6H₂O/SiO₂ aerogel composite phase change foam concrete

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Preparation and properties of CaCl2·6H2O/SiO2 aerogel composite phase change foam concrete