Influence of adding phase change materials on the physical and mechanical properties of cement mortars

Cunha, Sandra; Lima, Marine; Aguiar, José

doi:10.1016/j.conbuildmat.2016.09.119

Cited by 108 publications

(49 citation statements)

References 28 publications

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“…Regarding the mechanical strength, as reported also elsewhere [13], higher leves of replacement result in dramatic decreases of the compressive strength, halved when 30 % of PCM are added, and moderated decreases of flexural strength. A possible cause for these decreases in this study is the fact that part of the quartz aggregates, with high mechanical strength, was substituted with soft inclusions, which offer little mechanical resistance.…”

Section: Physical and Mechanical Characteriza-supporting

confidence: 78%

Frost damage progression studied through X-Ray tomography in mortar with Phase Change Materials

Rodriguez¹,

Figueiredo²,

Filho³

et al. 2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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The potential of using phase change materials (PCM) in cementitious materials to mitigate damage due to thermal loadings has been recently focus of intensive research. In the case of PCM with transition temperatures near to the freezing point of water, their potential to delay frost in a cementitious matrix has been largely investigated through the monitoring of internal temperature changes when exposed to repeated cycles of subzero and ambient temperature. Yet, the effect of these admixtures to prevent damage in cement-based materials has not been directly studied. In this paper, mortars cylinders of two different sizes and containing 0, 10 and 30% of PCM replacement by volume of aggregates were subjected to frost salt scaling during freeze and thaw cycles. Prior to the start of the weathering and after cycles 1, 3, 7 and 15 the cylindrical specimens were subjected to X-ray microtomography to monitor morphological changes due to frost action, such as chipping and cracks. Compressive and flexural strength, coefficient of thermal expansion and apparent porosity of the undamaged composites were also investigated. Results suggest that the improvement of frost scaling resistance of the mortars with incorporated PCM is a trade-off between resulting mechanical properties, thermal volume stability and porosity of the composite, as evinced from the better performance of mortars with 10% of PCM replacement.

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Section: Physical and Mechanical Characteriza-supporting

confidence: 78%

Frost damage progression studied through X-Ray tomography in mortar with Phase Change Materials

Rodriguez¹,

Figueiredo²,

Filho³

et al. 2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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show abstract

“…Different authors have incorporated this type of microencapsulated PCM in building materials such as cement, gypsum or cement-lime mortars [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Besides, other additions, such as fibres (cellulose) and lightweight aggregates (LWAs, e.g., perlite), can be also incorporated to improve the thermal insulation capacity of mortars [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…The experimental characterisation of materials’ properties is the first step necessary to evaluate the possibilities of their application for building purposes [ 1 , 12 , 13 , 14 , 16 ]. However, the actual effect of the newly designed materials for improving building enclosures can only be fully evaluated by considering the multi-layered composition of real enclosures.…”

Section: Introductionmentioning

confidence: 99%

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PCM Cement-Lime Mortars for Enhanced Energy Efficiency of Multilayered Building Enclosures under Different Climatic Conditions

2020

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Phase change materials (PCMs) are promising materials for the energy efficiency improvement of building enclosures, due to their energy storage capacity. The thermal behaviour of a multi-layered building enclosure with five different compositions of PCM cement-lime mortars was evaluated under heating and cooling cycles. The behaviour of cement-lime mortars with 20% of microencapsulated PCM mixed with other additions, such as cellulose fibres and perlite, a lightweight aggregate (LWA), were studied under climate conditions of 15 °C–82% RH (cooling) and 30 °C–33% RH (heating) that were applied with a climatic chamber. Temperature and heat flux on both sides of the multi-layered enclosure were experimentally measured in laboratory tests. Temperature was also measured on both sides of the PCM cement-lime mortar layer. It was observed that the addition of the PCM cement-lime mortar layer delayed the heat flux through the enclosure. During a heating cycle, the incorporation of PCM delayed the arrival of the heat wave front by 30 min (8.1% compared to the reference mortar without PCM). The delay of the arrival of the heat wave front during the cooling cycle after adding PCM, compared to the reference mixture, reached 40.6% (130 min of delay). Furthermore, the incorporation of LWA in PCM cement-lime mortars also improved thermal insulation, further increasing energy efficiency of the building enclosure, and can be used not only for new buildings but also for energy rehabilitation of existing building enclosures.

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“…The problem has been overcome by encapsulation methods that keep the PCM contained in polymer capsules. The capsules' size is small enough to be accommodated by the mortar's internal porosity [8], the shell is also capable of resisting the mixing and application processes without breaking. The use of polymethyl methacrylate (PMMA) capsules has been proven quite successful with cement, lime and gypsum matrices [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of latent heat storage in mortars containing microencapsulated paraffin waxes – a selection of optimal composition and binders

Lucas

Aguiar

2019

Heat Mass Transfer

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The application of phase change materials (PCMs) in mortars have been extensively researched, however, most studies are focused in one single binder. Conducting comparative assessments using different binders can facilitate the development of compositions with adequate heat storage and suitable mechanical properties. In this work, several PCM-mortars using cement, lime and gypsum as binders, have been studied using a laboratory simulation that mimicked the day/night temperature changes that the material will be subject during service applications. It has been demonstrated that the addition of PCMs in mortars allows the material to retain heat, indicating that these mortars can have a positive impact on the overall energy demand of buildings. There is a combined effect of delay and lowering of temperature peaks, triggered by the heat released from the capsules. The cells with PCMs showed not only a smaller temperature gradient between night and day, but it also exhibited lower peaks. The tests conducted with this laboratory setup prove that PCMs can be successfully mixed into mortars without compromising its durability, hence their applicability as wall renderings.

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Influence of adding phase change materials on the physical and mechanical properties of cement mortars

Cited by 108 publications

References 28 publications

Frost damage progression studied through X-Ray tomography in mortar with Phase Change Materials

Frost damage progression studied through X-Ray tomography in mortar with Phase Change Materials

PCM Cement-Lime Mortars for Enhanced Energy Efficiency of Multilayered Building Enclosures under Different Climatic Conditions

Evaluation of latent heat storage in mortars containing microencapsulated paraffin waxes – a selection of optimal composition and binders

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