Early-age temperature evolutions in concrete pavements containing microencapsulated phase change materials

Young, Benjamin A.; Falzone, Gabriel; She, Zhenyu; Thiele, Alexander M.; Wei, Zhenhua; Neithalath, Narayanan; Sant, Gaurav; Pilon, Laurent

doi:10.1016/j.conbuildmat.2017.04.150

Cited by 55 publications

(18 citation statements)

References 35 publications

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“…The onset of phase change corresponding to melting is measured at 19.07 °C, and the endothermic peak at 22.07 °C. Considering their phase change temperature, these particles are suitable for applications such as reduction of temperature rise in young concrete for structures cast in moderate climatic conditions, as shown by previous finite element (FE) analyses by the authors [ 10 ] and others [ 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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

2017

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“…The authors also proposed a formulation that represents the hydration-dependency of the PCM thermal conductivity and heat capacity. A study to examine the benefits related to the addition of microencapsulated PCMs in concrete pavement sections to mitigate the temperature rise during early-age cement hydration was recently proposed by Young et al [183].…”

Section: Macro-scale Modelsmentioning

confidence: 99%

Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites

2018

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Accumulating solar and/or environmental heat in walls of apartment buildings or houses is a way to level-out daily temperature differences and significantly cut back on energy demands. A possible way to achieve this goal is by developing advanced composites that consist of porous cementitious materials with embedded phase change materials (PCMs) that have the potential to accumulate or liberate heat energy during a chemical phase change from liquid to solid, or vice versa. This paper aims to report the current state of art on numerical and theoretical approaches available in the scientific literature for modelling the thermal behavior and heat accumulation/liberation of PCMs employed in cement-based composites. The work focuses on reviewing numerical tools for modelling phase change problems while emphasizing the so-called Stefan problem, or particularly, on the numerical techniques available for solving it. In this research field, it is the fixed grid method that is the most commonly and practically applied approach. After this, a discussion on the modelling procedures available for schematizing cementitious composites with embedded PCMs is reported.

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“…The tensile strain may also be created from early contraction caused by autogenous shrinkage [2]. Xu et al [3] and Young et al [4] reported that heat of hydration was one of the most important characteristics associated with thermal stress and concrete temperature during the early age of the pavement. Since the concrete mixture generates heat during the hydration process of cement, the pattern of concrete temperature during construction period is somewhat different from that occurred during the later ages of the concrete pavement [5].…”

Section: Introductionmentioning

confidence: 99%

An Early-age Evaluation of Thermal Cracking Index of Heavy Concrete Applying for Airport Pavement

Nguyen

Лам

Huynh

2020

Period. Polytech. Civil Eng.

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Industrial waste management has been an integral part of many countries in the world, including in Vietnam. In which, bottom ash (BA) has been used as a pozzolanic additive in compositions of the heavy concrete applying for airport concrete pavement (ACP), which allows reducing the hydration heat, the cost, and the thermal cracking of the concrete during the construction process. The purpose of this study is to summarize the experimental laboratory results of the heavy concrete samples containing 35 % BA sourced from a thermal power plant in Vietnam. The mechanical and thermal properties of the heavy concrete samples were determined at different curing ages. Besides, the heat of cement hydration during the preparation of the heavy concrete in the laboratory was measured using a "TAM AIR" isothermal calorimeter. Moreover, the Midas civil computer software based on the finite element method was used to analyze the temperature field and thermal cracking index of the ACP at the early ages. As the results, the heavy concrete had the respective thermal conductivity and the average of specific heat of 1.1 W/(m.°C) and 878.35 J/(kg.°C). Moreover, the value of thermal cracking index indicates that no cracking occurred on the ACP at the early ages. Furthermore, the results of the present study can be considered as a useful reference source for future projects that are associated with the construction of the ACP.

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Early-age temperature evolutions in concrete pavements containing microencapsulated phase change materials

Cited by 55 publications

References 35 publications

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

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

Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites

An Early-age Evaluation of Thermal Cracking Index of Heavy Concrete Applying for Airport Pavement

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