Mechanical properties and antifreeze performance of cement-based composites with liquid paraffin/diatomite capsule low-temperature phase change

Li, Yong; Zang, Chuyue; Zhang, Yunsheng; Jiang, Jinyang; Yuan, Zhengcheng; Liu, Guojian; Li, Huajian

doi:10.1016/j.conbuildmat.2022.127773

Cited by 19 publications

(3 citation statements)

References 20 publications

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“…Articles describing possible solutions to the problem of freezing PMC composites are presented below. An important scientific problem and limitation of the use of PCM in temperate climates is the frost resistance of PCM composites, as highlighted in [ 48 , 49 ]. Using [ 50 ] as an example, it was noted that in composite mortars with a cement matrix and PCM in the form of encapsulated microgranulate, a microgranulate content of more than 30% resulted in a noticeable reduction in mechanical performance and a risk of failure of the frozen composite.…”

Section: Introductionmentioning

confidence: 99%

Multi-Faceted Analysis of Phase-Change Composite Intended for Autonomous Buildings

Musiał,

Lichołai

2024

Materials

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This paper presents the long-term, holistic results of research into an innovative heat accumulator based on an organic phase-change material in the form of a mixture of aliphatic alkanes, molecular silica sieves, carbon recyclate and epoxy and cement matrices. The research included chemical testing of vacuum soaking of molecular silica sieves with a liquid phase-change material. The results proved an improvement in the heat storage efficiency of the heat accumulators due to the addition of carbon recyclate by 28%, while increasing the heat storage time by 134 min, and a reduction in PCM leakage due to the use of molecular silica sieves. In addition to its cognitive scientific value, another research objective of the work achieved was to obtain response functions in the form of approximating polynomials. They provide a useful, validated and verified tool to predict the physical and chemical characteristics of heat accumulators with different contents of individual components. As part of the ongoing research, technical problems related to leak-proofing assurance and matrix selection for organic phase-change materials were also solved. The solution presented is in line with the issues of efficient use of renewable energy, low-carbon and energy-efficient circular economy.

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Section: Introductionmentioning

confidence: 99%

Multi-Faceted Analysis of Phase-Change Composite Intended for Autonomous Buildings

Musiał,

Lichołai

2024

Materials

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“…Tian et al [27] developed artificial PCM aggregate, and their results showed that the PCM aggregates have high freeze-thaw resistance, with maximum strength reaching 66% of 28 d strength after 200 freeze-thaw cycles. Liu et al [28] prepared cementitious materials integrated with PCM encapsulated by diatomite, showing that the incorporation of PCM weakened the mechanical properties of the cement matrix but improved the frost resistance. This can be explained by the following effect of PCM: when ambient temperature drops below the critical level, PCMs release latent heat, which guarantees the cement matrix at a relatively safe level.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete

Liu,

Wang,

Jia

et al. 2023

Buildings

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Stepwise phase change material (PCM) aggregate concrete has advantages in controlling temperature and resisting frost heave, but its freeze–thaw resistance performance is still unclear. This paper explored the impact of replacing ordinary coarse aggregate with stepwise aggregate on the freeze–thaw resistance characteristics of concrete. Firstly, the compressive strength, splitting tensile strength, and their relationship were evaluated. Then, the freeze–thaw resistance properties of PCM aggregate concrete were investigated, including macroscopic changes, mass loss, relative dynamic elasticity modulus loss, and compressive strength loss. Subsequently, the pore changes before and after freeze–thaw cycles were tested through non-destructive testing and nuclear magnetic resonance (NMR) testing, and the evolution of pores under freeze–thaw cycles was explored. The results show that adding 100% PCM aggregate reduces the strength of concrete by 32%. However, due to the high porosity in the 100% PCM aggregate concrete, it would have an adverse impact on corrosion resistance. The corrosion resistance of concrete increases firstly and then decreases with the addition of PCM aggregate, which can be attributed to PCM aggregate having a limiting effect on pore development. Overall, a substitution rate of 60% is acceptable for compressive strength and corrosion resistance.

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“…In building construction, it is common to incorporate PCMs into building walls to enhance the heat storage performance of the envelope structure. By adding PCMs to the walls, the ability of the building to store and release heat effectively is improved, contributing to better thermal comfort and energy efficiency [13][14][15][16][17][18]. The investigation of the mechanical and thermal properties of concrete materials containing PCMs is a significant focus in the field of building energy conservation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Zhang,

Han,

Liu

et al. 2023

Energies

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Based on phase-change heat storage backfill, paraffin microcapsules were selected as the phase change material and were directly mixed with backfill materials for preparing backfill specimens. The mechanical and thermal properties of specimens with different paraffin percentages and slurry concentrations were tested and analyzed. The results show that compressive strength gradually decreases with an increasing paraffin percentage while it significantly increases with increasing slurry concentration, thermal conductivity decreases with increasing paraffin percentage and specific heat capacity increases with an increasing paraffin percentage and slurry concentration. For a paraffin percentage from 0% to 10%, compressive strength decreases by an average of 22.5%, thermal conductivity decreases by an average of 43.8% and specific heat capacity increases by an average of 8.7% at a phase-change temperature of 30 °C. For a slurry concentration from 68% to 72%, compressive strength increases by an average of 4.12 times, and specific heat capacity increases by an average of 3.5% at a phase-change temperature of 30 °C. The weakening effect of phase-change materials on compressive strength can be effectively improved by the increase of slurry concentration, and the increases of paraffin percentage and slurry concentration can both improve the sensible heat storage capacity of backfill materials.

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Mechanical properties and antifreeze performance of cement-based composites with liquid paraffin/diatomite capsule low-temperature phase change

Cited by 19 publications

References 20 publications

Multi-Faceted Analysis of Phase-Change Composite Intended for Autonomous Buildings

Multi-Faceted Analysis of Phase-Change Composite Intended for Autonomous Buildings

Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

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