Multiphysics analysis of effects of encapsulated phase change materials (PCMs) in cement mortars

Djamai, Zakaria Ilyes; Salvatore, Ferdinando; Larbi, Amir Si; Cai, Gaochuang; Mankibi, Mohamed El

doi:10.1016/j.cemconres.2019.02.002

Cited by 83 publications

(14 citation statements)

References 19 publications

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“…The reductions in flexural strength values calculated on mortars based on cement (CEM I type) and containing a PCM system achieved up to 50% depending on the kind and amount of PCM system [56]. The reductions in compressive strength are even more severe (up to 70%) at the highest contents of encapsulated PCM [20,21,56,62]. Our cement-based mortars containing LS/PEG PCM, therefore, followed the same trend, once again referring to the mortar containing the highest content of cement, i.e., 800 kg/m 3 .…”

Section: Resultsmentioning

confidence: 99%

Applications of Sustainable Polymer-Based Phase Change Materials in Mortars Composed by Different Binders

et al. 2019

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Eco-sustainable, low toxic and low flammable poly-ethylene glycol (PEG) was forced into flakes of the porous Lecce stone (LS), collected as stone cutting wastes, employing a very simple cheap method, to produce a “form-stable” phase change material (PCM). The experimental PCM was included in mortars based on different binders (hydraulic lime, gypsum and cement) in two compositions. The main thermal and mechanical characteristics of the produced mortars were evaluated in order to assess the effects due to the incorporation of the PEG-based PCM. The mortars containing the PEG-based PCM were found to be suitable as thermal energy storage systems, still displaying the characteristics melting and crystallization peaks of PEG polymer, even if the related enthalpies measured on the mortars were appreciably reduced respect to pure PEG. The general reduction in mechanical properties (in flexural and compressive mode) measured on all the mortars, brought about by the presence of PEG-based PCM, was overcome by producing mortars possessing a greater amount of binder. The proposed LS/PEG composite can be considered, therefore, as a promising PCM system for the different mortars analyzed, provided that an optimal composition is identified for each binder.

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Section: Resultsmentioning

confidence: 99%

Applications of Sustainable Polymer-Based Phase Change Materials in Mortars Composed by Different Binders

et al. 2019

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“…They considered that the mortar prepared by a basic mix (sand: cement = 3:1 or sand: cement: PCM = 2:1:2) could evaluate thermal and mechanical properties. Djamai et al considered the hydrophilicity of PCM, tested the water absorption capacity of PCM, adjusted the water‐to‐binder ratio (W/C), and then carried out the mixing design based on slump.…”

Section: Methodsmentioning

confidence: 99%

“…The mechanical properties of concrete was improved by the microaggregate effect of PCM; however, the amount of PCM incorporated was limited (less than 3%). Djamai et al revealed the interaction between microencapsulated PCM and cement through various detection methods. They found that there were two factors that caused the strength of PCM mortar dropping.…”

Section: Introductionmentioning

confidence: 99%

Characterization of novel shape‐stabilized phase change material mortar: Portland cement containing Na ₂ SO ₄ ·10H ₂ O and fly ash for energy‐efficient building

Liu

Qiu

et al. 2019

Int J Energy Res

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Summary In this work, a novel Na2SO4·10H2O/fly ash shape‐stabilized phase change material mortar (PCM mortar) was prepared for building energy efficiency, in the context of energy conservation and environmental protection. The working, mechanical, and thermal properties of this proposed PCM mortar were investigated. The experiment results showed that the incorporation of PCMs greatly increased the thermal inertia of the mortar, while corresponding compressive strength was little affected. Specifically, when the blending amount of PCMs reached 15%, the thermal storage capacity of mortar sample (PCM‐15) was 6.18 × 104 kJ/m3, which is 2.4 times of that for mortar sample without PCM (OPC) evaluated by theoretical calculations, while the corresponding compressive strength of mortar sample (PCM‐15) still remained above 31 MPa. Furthermore, the effects of PCM mortar on thermal comfort and energy use of buildings were studied by using experiment and simulation methods, respectively. The control experiments showed that PCM mortar can effectively alleviate the influence of outdoor temperature on indoor temperature compared with OPC. Temperature difference between PCM‐15 and OPC board can reach 4.6°C (inner surface) and 8.6°C (outer surface), respectively. Meanwhile, temperature difference of internal space reached 1.2°C. The simulation results showed that the energy consumption per unit building area was reduced by 4.4 and 18.7 kg/m2 in Guangzhou and Harbin, respectively, with PCM mortar as the envelope structure. Hence, the proposed PCM mortar showed significant thermal and mechanical properties and had broad application prospects in regulating indoor temperature and constructing energy‐efficient buildings.

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“…This paper presents a simpler and innovative method able to derive E a and, in turn, to construct the strength– MI curve for both normal-strength and ultra-high-performance fiber-reinforced concretes, by using a semi-adiabatic calorimetry technique. This method also allows to determine the α ( t )– E t ( t ) curve, thus providing a powerful tool for quality control of hardening of cement-based materials in concrete batching plants as well as to explain the evolution of the mechanical properties of these composites [ 23 ]. The model and the tests’ procedure presented are innovative also because they make the apparatus auto-calibrating and because the model, giving a prediction with a pair of specimens, will provide over a hundred predictions with eight specimens (four runs of the apparatus).…”

Section: Introductionmentioning

confidence: 99%

An Auto-Calibrating Semi-Adiabatic Calorimetric Methodology for Strength Prediction and Quality Control of Ordinary and Ultra-High-Performance Concretes

et al. 2021

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A timely knowledge of concrete and ultra-high-performance concrete (UHPC) strength is possible through the so-called strength-equivalent time (Et) curves. A timely knowledge of concrete strength is useful, for instance, to precisely determine when the shores of a hardening structural element can be safely removed. At the present time, the preparation of the strength-Et curves requires time-consuming and labor-intensive testing prior to the beginning of construction operations. This paper proposes an innovative method to derive the strength-Et and total heat-Et curves for both normal strength and UHPC. Results confirmed that the proposed method is fast, inexpensive, self-calibrating, accurate and can detect any variation of the concrete mix proportions or components quality. In addition, the quality of predictions of strength–maturity curves can be constantly improved as the specimens’ population increases. Finally, results obtained with the proposed method were compared with those obtained using standard methods, showing a good agreement.

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Multiphysics analysis of effects of encapsulated phase change materials (PCMs) in cement mortars

Cited by 83 publications

References 19 publications

Applications of Sustainable Polymer-Based Phase Change Materials in Mortars Composed by Different Binders

Applications of Sustainable Polymer-Based Phase Change Materials in Mortars Composed by Different Binders

Characterization of novel shape‐stabilized phase change material mortar: Portland cement containing Na ₂ SO ₄ ·10H ₂ O and fly ash for energy‐efficient building

An Auto-Calibrating Semi-Adiabatic Calorimetric Methodology for Strength Prediction and Quality Control of Ordinary and Ultra-High-Performance Concretes

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Multiphysics analysis of effects of encapsulated phase change materials (PCMs) in cement mortars

Cited by 83 publications

References 19 publications

Applications of Sustainable Polymer-Based Phase Change Materials in Mortars Composed by Different Binders

Applications of Sustainable Polymer-Based Phase Change Materials in Mortars Composed by Different Binders

Characterization of novel shape‐stabilized phase change material mortar: Portland cement containing Na 2 SO 4 ·10H 2 O and fly ash for energy‐efficient building

An Auto-Calibrating Semi-Adiabatic Calorimetric Methodology for Strength Prediction and Quality Control of Ordinary and Ultra-High-Performance Concretes

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Characterization of novel shape‐stabilized phase change material mortar: Portland cement containing Na ₂ SO ₄ ·10H ₂ O and fly ash for energy‐efficient building