Development of ductile cementitious composites incorporating microencapsulated phase change materials

Šavija, Branko; Luković, Mladena; Kotteman, Geerte; Figuieredo, Stefan Chaves; Filho, Fernando França de Mendoça; Schlangen, Erik

doi:10.1007/s12572-017-0182-9

Cited by 13 publications

(17 citation statements)

References 33 publications

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“…A major drawback of using micro encapsulated PCMs is their negative influence on strength: The higher the amount of PCMs, the lower the strength. This reduction is, however, less pronounced for tensile strength compared to compressive strength [1,[11][12][13].…”

Section: Introductionmentioning

confidence: 93%

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

et al. 2019

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This paper presents a numerical investigation of thermal response of mortar panels, incorporating macro-encapsulated paraffin in different forms. Two types of macro capsules were fabricated and tested in this study using an instrumented hot plate device. The experimental results show that macro encapsulated paraffin reduced the temperature and increased time lag in the mortar panels due to the latent heat capacity of paraffin. Finite element models adopting the effective heat capacity method to model phase change effects were able to capture the overall thermal response of panels incorporated with paraffin well. Then, a parametric study was conducted using the validated finite element (FE) modelling technique to investigate the effects of different forms of macro capsules, the quantity of paraffin and the position of macro capsules. It was found that the tube and sphere macro capsules showed similar thermal responses, while the plate shaped capsules may cause a non-uniform temperature distribution in mortar panels. The quantity and position of paraffin have significant effects on the thermal response of the mortal panels. A higher paraffin content results in a significantly longer temperature lag and a lower temperature during the phase transition of paraffin. Furthermore, placing the paraffin away from the heating face can cause a longer temperature lag on the other face, which is desirable for building façade applications.

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Section: Introductionmentioning

confidence: 93%

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

et al. 2019

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“…They have very little effect on the flexural strength and deflection capacity. The compressive capacity is slightly reduced while concrete surface of the elements become extremely ductile [13]. In this test the main concern was to deal with brittleness, explosive failure and to improve ductility of LWAC.…”

Section: Materials and MIX Propertiesmentioning

confidence: 99%

Failure of Lightweight Aggregate Concrete in Compression under Stress Gradients

Živković

Øverli

2019

Nordic Concrete Research

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The objective of this experiment is to investigate the behaviour of lightweight aggregate concrete (LWAC) under compression and with stress gradients. Experimental program contained three sets of LWAC which were used for production of 21 prisms. Lightweight aggregate argillite slate, called Stalite, from North Carolina had been used. The sets differed in using dry (0.10% moisture content) or saturated (7.9% moisture content) aggregate. The third set included a small amount of polyvinyl alcohol fibres (PVA). The geometry of the prisms were 100 × 140 × 480 mm (width × length × height). Prismatic samples were loaded centrically and eccentrically in compression. From the achieved experimental results, it is visible that the lateral deformation of the most stressed fibre is counteracted by the less stressed fibres that confine compressive stress and increase strains. The obtained strain level was much higher than expected, especially for the third set of concrete samples with PVA fibres. Recorded strains in prisms test was in range from 3.08‰ to 6.82‰). In general, LWAC with Stalite showed ductile behaviour followed with very high strains. The third set of samples included a small amount of polyvinyl alcohol fibres (0.5% of volume fractions) was even more ductile and non-brittle.

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“…On the other hand, if the cracking is caused by thermal variations (such as early age temperature rise due to cement hydration or freeze-thaw damage), controlling the temperature is a good option. To achieve this, incorporation of phase change materials (PCMs) has been proposed in the past few years [ 7 , 8 , 9 , 10 ]. Phase change materials are combined (sensible-and-latent) thermal storage materials that can store and dissipate energy in the form of heat [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…When microencapsulated PCMs are added to the mix, they influence the mechanical properties of the cement paste and, consequently, concrete [ 8 , 9 , 13 , 14 ]. This is (presumably) because the microcapsules are softer than the matrix material.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Microencapsulated Phase Change Material (PCM) Addition on (Micro) Mechanical Properties of Cement Paste

2017

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Excessive cracking can be a serious durability problem for reinforced concrete structures. In recent years, addition of microencapsulated phase change materials (PCMs) to concrete has been proposed as a possible solution to crack formation related to temperature gradients. However, the addition of PCM microcapsules to cementitious materials can have some drawbacks, mainly related to strength reduction. In this work, a range of experimental techniques has been used to characterize the microcapsules and their effect on properties of composite cement pastes. On the capsule level, it was shown that they are spherical, enabling good distribution in the material during the mixing process. Force needed to break the microcapsules was shown to depend on the capsule diameter and the temperature, i.e., whether it is below or above the phase change temperature. On the cement paste level, a marked drop of compressive strength with increasing PCM inclusion level was observed. The indentation modulus has also shown to decrease, probably due to the capsules themselves, and to a lesser extent due to changes in porosity caused by their inclusion. Finally, a novel micro-cube splitting technique was used to characterize the tensile strength of the material on the micro-meter length scale. It was shown that the strength decreases with increasing PCM inclusion percentage, but this is accompanied by a decrease in measurement variability. This study will contribute to future developments of cementitious composites incorporating phase change materials for a variety of applications.

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Development of ductile cementitious composites incorporating microencapsulated phase change materials

Cited by 13 publications

References 33 publications

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study

Failure of Lightweight Aggregate Concrete in Compression under Stress Gradients

Influence of Microencapsulated Phase Change Material (PCM) Addition on (Micro) Mechanical Properties of Cement Paste

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