The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement

Dakhli, Zakaria; Chaffar, Khaled; Lafhaj, Zoubeir

doi:10.3390/sci1010027

Cited by 12 publications

(8 citation statements)

References 18 publications

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“…Thermal conductivity decreases when the addition of PCM to cement increases. This proves that the integration of PCM into cement can improve thermal insulation (Dakhli et al 2019).…”

Section: The Effect Of Pcm On Thermal Conductivitymentioning

confidence: 58%

A LITERATURE REVIEW ABOUT EFFECTS of PHASE CHANGING MATERIALS on COMPRESSIVE STRENGTH and THERMAL CONDUCTIVITY of BUILDING COMPONENTS

Çelik

Kayabaşi

ŞENER

2022

Mühendislik Bilimleri Ve Tasarım Dergisi

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One of the important areas of Phase Changing Materials (PCM) is to increase the heat retention capacity of building components. Researches are carried out on the heat retention capacities of PCMs to store energy in building components and to ensure building temperature control. The use of PCM in building components has become an important tool for energy saving, since ensuring building temperature control in summer and winter conditions is a situation that requires continuity. This feature provided to the building component provides an improvement in the energy identity of the building. In general researches, the use of macro, micro encapsulated PCM decreases the heat conduction coefficient as it increases the heat retention capacity of the building components, but effects compressive strength positive or negative. However, when the capsule size used in micro capsule applications is reduced to 7 microns and below, it is seen that the strength increases, while the thermal conductivity coefficient continues to decrease. When the PCM capsule particle sizes used in the building components are reduced, it provides an improvement in the granulometry of the component, so a positive effect on strength is seen in the building components. As a result of this research, differences in compressive strength were observed depending on the macro, micro and nano dimensions and mixing ratios of the pcm addition. However, due to the continuous increase in the PCM ratio of the building component, the heat holding capacity of the building component increases and its thermal conductivity decreases.

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“…Thermal conductivity decreases when the addition of PCM to cement increases. This proves that the integration of PCM into cement can improve thermal insulation (Dakhli et al 2019).…”

Section: The Effect Of Pcm On Thermal Conductivitymentioning

confidence: 58%

A LITERATURE REVIEW ABOUT EFFECTS of PHASE CHANGING MATERIALS on COMPRESSIVE STRENGTH and THERMAL CONDUCTIVITY of BUILDING COMPONENTS

Çelik

Kayabaşi

ŞENER

2022

Mühendislik Bilimleri Ve Tasarım Dergisi

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“…The measuring instrument was the Fox-200. The optimal delta of temperature between the plates (lower and upper) suggested by manufacture is 20 °C [ 33 , 34 ], according to [ 32 ] standard for steady-state measurements, and the arithmetic mean of temperature (T1 + T2)/2 was adopted as the repetitive temperature for measuring thermal conductivity.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study on the Development of Fly Ash Foam Concrete Containing Phase Change Materials (PCMs)

Pareek¹

2022

Materials

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Phase change materials (PCMs) have the ability to absorb and release a large amount of energy during the process of transforming physical properties (i.e., phase transition process). PCMs are suitable for thermal energy storage and reducing energy consumption in buildings. The aim of the study is to assess the basic material properties and thermal behavior of fly ash foam concrete mixed with two different types of microencapsulated PCMs (PCM6D and PCM18D). We made five different varieties of fly ash foam concrete by replacing the equivalent unit weight of cement with PCM 0%, PCM10% and PCM30%. The results show that using a new type of mixer, the microencapsulated PCMs kept their spherical shapes without any cracks or damage in the foam concrete matrix. Differential scanning calorimetry analysis showed that PCM18D-30% had a latent heat capacity of 19.2 °C and 44.7 J/g, in liquid and solid phase with melting and freezing temperatures of 9.46 °C and 41.7 J/g respectively. Additionally, thermocycle analysis showed that it had maintained the temperature for 8 h within the phase change range. In conclusion, PCMs can reduce indoor temperature fluctuations and exhibit the potential for enhancing energy savings and thermal comfort of buildings.

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“…Portland cement is the adhesive utilized most frequently in concrete mixtures. It is produced by the combustion of limestone (CaCO 3 ), silica sand (SiO 2 ), clay (Al 2 O 3 ), and iron oxide (Fe 2 O 3 ) at room temperature, which is extremely high at 1400 o C to 1500 o C for fossil fuels [3,4,13,[5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Compressive Test and Microstructure Analysis of the Coconut Fiber Ash-based Geopolymer Binder

Widnyana¹,

Salain²,

Sutarja³

et al. 2023

cea

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This watchfulness goal is to define the compressive test value and microstructure of a geopolymer binder made from coconut fiber ash (CFA). CFA comes from the combustion of coconut fibers in the tile-making industry in Tabanan, Bali. This waste is processed into CFA, which consists of 8.24% silicon dioxide, 70.6% potassium oxide, 14.1% chlorine, 2.3% diphosphate pentoxide, and 2.25% iron dioxide. CFA is then used as a crude material for the manufacture of geopolymer binders. The mixture's proportion consisted of three groups of variations: the ratio of precursors and activators, P/A: 70%:30%; 75%:25%; and 80%:20%. In the experiment, Na 2 SiO 3 and a 14 M molar concentration of NaOH were combined in weight ratios of 1:1, 1.5:1, and 2:1. These are both alkaline activators. The sample was shaped into 50-mm cubes, dried in an 80°C heater for 24 hours, and then tested at 7 and 28 days. The ASTM-C39 standard was used for the compression test, while the microstructural analysis used X-RD and SEM-EDX. The results showed that coconut fiber ash precursors could be used to generate a geopolymer binder with a compressive value of 4.67 MPa and 6.24 MPa on the 7 th and 28 th days of testing, respectively. The microstructure of the solid sample, which was associated with the rise in compressive value, was characterized using scanning electron microscopy. Using 80% CFA gave the best results.

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The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement

Cited by 12 publications

References 18 publications

A LITERATURE REVIEW ABOUT EFFECTS of PHASE CHANGING MATERIALS on COMPRESSIVE STRENGTH and THERMAL CONDUCTIVITY of BUILDING COMPONENTS

A LITERATURE REVIEW ABOUT EFFECTS of PHASE CHANGING MATERIALS on COMPRESSIVE STRENGTH and THERMAL CONDUCTIVITY of BUILDING COMPONENTS

Experimental Study on the Development of Fly Ash Foam Concrete Containing Phase Change Materials (PCMs)

Compressive Test and Microstructure Analysis of the Coconut Fiber Ash-based Geopolymer Binder

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