Properties of cementitious mortar and concrete containing micro-encapsulated phase change materials

Jayalath, Amitha; Nicolas, Rackel San; Sofi, Massoud; Shanks, Robert A.; Ngo, Tuan; Aye, Lu; Mendis, Priyan

doi:10.1016/j.conbuildmat.2016.05.116

Cited by 177 publications

(67 citation statements)

References 19 publications

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“…This method does not alter the physical or chemical features of the specimen [32]. One side of the cube was polished with a silicon disc, which makes it flat and further ensures clarity of the images [33]. Specimens for XRD tests were pulverized using a pestle and mortal before they were mounted on an aluminum slide and scanned from 0 to 75° 2θ with a scan rate of 0.1 steps per minute.…”

Section: Methodsmentioning

confidence: 99%

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Awoyera

Dawson

Thom

et al. 2017

Construction and Building Materials

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Using industrial wastes and local materials as artificial aggregates in cement based materials remains a relevant measure for conservation of natural sources. In this study, novel cementitious mixes containing pulverized ceramic blended cement, ceramic aggregate and laterite were systematically combined to produce cement mortars. The mortar specimens were cured in water for a maximum of 28 days. At maturity, nondestructive tests, X-ray CT scan and Ultrasonic pulse velocity, were performed on hardened mortars. Thereafter, a series of predefined properties, namely dry bulk density, compressive and flexural strength, water absorption coefficient (due to capillary) of the hardened mortars were determined. Finally, in order to understand the hydration mechanism of the materials as it relates to the strength properties, microscale tests, SEM and XRD, were used to examine the fragments of the selected mortars. From the results, a mortar sample containing 10% ceramic powder and 100% ceramic aggregate as replacements for cement and sand respectively, gave higher strength values than the reference and other mixes.Microstructural analysis of the best mix revealed that it has larger proportions of ettringite, portlandite and calcite than the reference mix, and this could be responsible for the strength 2 gained. Thus, despite the apparent low reactivity of crushed ceramic material, this can improve bonding in cement-based mixture, when used at an appropriate concentration.

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Section: Methodsmentioning

confidence: 99%

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Awoyera

Dawson

Thom

et al. 2017

Construction and Building Materials

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show abstract

“…These results seem to indicate that the replacement of sand volume by PCM microcapsules influences strongly the pore structure of the mortars. In a study from [11], the authors indicate that PCM microcapsules promote nucleation of reaction products and therefore the phases assemblage in the hydrated matrix changed. A second explanation may come from the increase in specific surface of the interfacial transition zone (ITZ) due to the replacement of aggregates with variegated dimensions ranging from 0.08 to 2 mm by microcapsules.…”

Section: Physical and Mechanical Characteriza-mentioning

confidence: 99%

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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“…Moreover, the heat transfer efficiency was improved attribute to larger specific surface area. Therefore, the MPCMs have been widely attempted to be used in building materials, thermal energy storage, thermal regulated fiber, thermal regulated foam board, latent functionally thermal fluids, temperature regulation, and so forth …”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of microencapsulated phase change material with a urea–formaldehyde resin shell and paraffin wax core

Huo

Peng

Feng

2019

J of Applied Polymer Sci

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During this study, paraffin wax with low melting point was encapsulated in a urea-formaldehyde resin to prepare a novel microencapsulated phase change material (Micro-P6) for temperature regulation and thermal energy storage. The structure and properties of Micro-P6 were characterized by using Fourier transform infrared spectroscopy, differential scanning calorimeter, laser particle size analyzer, thermogravimetric analysis, contact angle analysis, and scanning electron microscope. The results indicated that the chemical structure of Micro-P6 meets the designed core-shell structure; and the paraffin wax with low melting point was successfully encapsulated by using urea-formaldehyde resin; and the Micro-P6 shows a spherical structure and rough surface, and the average size is 8.0-10.0 μm. Then, the performances of Micro-P6, such as core content, mechanical property, thermal conductivity and durability, were tested. Based on above characterization and performance test, it was indicated that the synthesized Micro-P6 could be used in the field of cementing and construction for temperature regulation and thermal energy storage. The applications of Micro-P6 in the field of cementing and construction will be completed in our next study.

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Properties of cementitious mortar and concrete containing micro-encapsulated phase change materials

Cited by 177 publications

References 19 publications

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

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

Synthesis and properties of microencapsulated phase change material with a urea–formaldehyde resin shell and paraffin wax core

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