Abstract
Microencapsulated phase-change materials (MPCM) can be used to develop a structural–functional integrated cement paste having high heat storage efficiency and suitable mechanical strength. However, the incorporation of MPCM has been found to degrade the mechanical properties of cement based composites. Therefore, in this research, the effect of carbon nanotubes (CNTs) on the properties of MPCM cement paste was evaluated. Test results showed that the incorporation of CNTs in MPCM cement paste accelerated the cement hydration reaction. SEM micrograph showed that CNTs were tightly attached to the cement hydration products. At the age of 28 days, the percentage increase in flexural and compressive strength with different dosage of CNTs was found to be up to 41% and 5% respectively. The optimum dosage of CNTs incorporated in MPCM cement paste was found to be 0.5 wt %. From the thermal performance test, it was found that the cement paste panels incorporated with different percentages of MPCM reduced the temperature measured at the center of the room by up to 4.6 °C. Inverse relationship was found between maximum temperature measured at the center of the room and the dosage of MPCM.
Highlights
Cement based composite is an important and versatile building material in every area of construction worldwide
There is no evidence that carbon nanotubes (CNTs) have great influence on cement hydration at the stages of the first deceleration and induction
We developed CNT modified cement paste containing microencapsulated PCM
Summary
Cement based composite is an important and versatile building material in every area of construction worldwide. A structural–functional integrated cement-based material means that the material serves both as a structural material for building applications and as a functional material for thermal energy storage applications [3]. The technology of utilizing phase-change materials (PCMs) to store and retrieve latent heat has been considered a simple and effective technique for application to building envelopes to enhance the energy efficiency of buildings [4,5]. Microencapsulated PCM (MPCM) provides a high heat transfer rate through its larger surface area per unit volume and is capable of resisting volume change during phase transition. It is known that the addition of MPCM degrades the mechanical properties of structural–functional integrated composite materials. Cui et al [10] experimentally investigated the effect of the incorporation of different percentages of microencapsulated PCM
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