The durability of cementitious composites containing microencapsulated phase change materials

Wei, Zhenhua; Falzone, Gabriel; Wang, Bu; Thiele, Alexander M.; Puerta-Falla, Guillermo; Pilon, Laurent; Neithalath, Narayanan; Sant, Gaurav

doi:10.1016/j.cemconcomp.2017.04.010

Cited by 91 publications

(45 citation statements)

References 42 publications

(53 reference statements)

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“…Figure 1: (a) A scanning electron micrograph of "core-shell" microencapsulated phase change materials (PCMs) wherein the core is the active phase change component (e.g., often alkanes of composition CnH2n+2) and the shell is a polymer structure often comprised of melamineformaldehyde (MF) (N.B. : Only the MF shell is visible in this image ‡ ‡ ) [9], and, (b) The compressive strength, fc, of cementitious mixtures containing quartz or microencapsulated PCM inclusions after 28 days of aging as a function of the inclusion volume fraction (VF) [10].…”

Section: Introductionmentioning

confidence: 99%

Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions: A paste (matrix) controlled response

Wei¹,

Falzone²,

Das

et al. 2017

Materials & Design

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The addition of phase change materials (PCMs) has been proposed as a means to mitigate thermal cracking in cementitious materials. However, the addition of PCMs, i.e., soft inclusions, degrades the compressive strength of cementitious composites. From a strength-of-materials viewpoint, such reductions in strength are suspected to increase the tendency of cementitious materials containing PCMs to crack under load (e.g., volume instability-induced stresses resulting from thermal and/or hygral deformations). Based on detailed assessments of free and restrained shrinkage, elastic modulus, and tensile strength, this study shows that the addition of PCMs does not alter the cracking sensitivity of the material. In fact, the addition of PCMs (or other soft inclusions) enhances the cracking resistance as compared to a plain cement paste or composites containing equivalent dosages of (stiff) quartz inclusions. This is because composites containing soft inclusions demonstrate benefits resulting from crack blunting and deflection, and improved stress relaxation. As a result, although the tensile stress at failure remains similar, the time to failure (i.e., macroscopic cracking) is considerably extended in the case of PCM-containing composites. More generally, the outcomes indicate that dosages of soft(er) inclusions, and the resulting decrease in compressive strength does not amplify the cracking risk of cementitious composites.

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Section: Introductionmentioning

confidence: 99%

Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions: A paste (matrix) controlled response

Wei¹,

Falzone²,

Das

et al. 2017

Materials & Design

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“…For application in buildings, the coating needs to achieve a good compromise between hardened state properties and heat transfer, so 20% PCM will be more beneficial for the mortar's durability. It has been demonstrated that the presence of PCM capsules in mortars [46], even with several cooling and melting cycles, does not affect its durability-it was not observed any cracking in the mortars' layers of the cells subject to thermal cycling.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional wall coating combining photocatalysis, self-cleaning and latent heat storage

Lucas¹,

Aguiar²

2018

Mater. Res. Express

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Mortars, one of the most common construction materials, have not received any substantial modification for many decades. This has changed in recent years; new compositions are now being developed, with new properties, using nano-additives, fibres and capsules. In this work, surfaces with new and innovative functionalities that promote energy savings and improve air quality have been developed and studied. Incorporation of phase change materials (PCM) and titanium dioxide (TiO 2) nanoparticles in construction products is currently under study by different research groups. However, these studies only address their incorporation separately. Adding new additives into the mortar's matrix can be complex-due to microstructural modifications that will influence both fresh and hardened state properties. Moving from a single additive to multiple additions, as in this study, increases the system's complexity. Only with a good understanding of the microstructural properties, it is possible to add multiple additives (including nano and microparticles) to mortars, without damaging its final quality. This work demonstrates that a higher additive content is not always a guarantee of better results; lower additions can often provide a better compromise between performance and final mechanical properties. The results presented in this paper confirmed this and show that combining PCM microcapsules and TiO 2 nanoparticles open a new path in the development of mortars with multiple functionalities. In this study, a new material with depolluting, self-cleaning and heat storage was created. For the development of new and innovative mortars, a proper balance of multiple additives, supported by the study of microstructural changes, can lead to an optimization of the compositions, ensuring that the mortar's final properties are not affected.

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“…Wei et al reported the durability of cementitious composite containing commercially available micro‐PCMs. The results revealed that micro‐PCMs reduced the rate and extent of water sorption and did not affect the dry shrinkage of cementitious composites.…”

Section: Application Of Micro‐/nano‐pcmsmentioning

confidence: 99%

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

et al. 2019

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Summary With advancement in technology—nanotechnology, various thermal energy storage (TES) materials have been invented and modified with promising thermal transport properties. Solid‐liquid phase change materials (PCMs) have been extensively used as TES materials for various energy applications due to their highly favourable thermal properties. The class of PCMs, organic phase change materials (OPCMs), has more potential and advantages over inorganic phase change materials (IPCMs), having high phase change enthalpy. However, OPCMs possess low thermal conductivity as well as density and suffer leakage during the melting phase. The encapsulation technologies (ie, micro and nano) of PCMs, with organic and inorganic materials, have a tendency to enhance the thermal conductivity, effective heat transfer, and leakage issues as TES materials. The encapsulation of PCMs involves several technologies to develop at both micro and nano levels, called micro‐encapsulated PCMs (micro‐PCM) and nano‐encapsulated PCMs (nano‐PCM), respectively. This study covers a wide range of preparation methods, thermal and morphological characteristics, stability, applications, and future perspective of micro‐/nano‐PCMs as TES materials. The potential applications, such as solar‐to‐thermal and electrical‐to‐thermal conversions, thermal management, building, textile, foam, medical industry of micro‐ and nano‐PCMs, are reviewed critically. Finally, this review paper highlights the emerging future research paths of micro‐/nano‐PCMs for thermal energy storage.

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The durability of cementitious composites containing microencapsulated phase change materials

Cited by 91 publications

References 42 publications

Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions: A paste (matrix) controlled response

Restrained shrinkage cracking of cementitious composites containing soft PCM inclusions: A paste (matrix) controlled response

Multifunctional wall coating combining photocatalysis, self-cleaning and latent heat storage

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

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