Effect of microencapsulated phase change materials on the flow behavior of cement composites

Sanfélix, Susana G.; Santacruz, Isabel; Szczotok, Anna M.; Belloc, Luis Miguel O.; Torre, Ángeles G. De la; Kjøniksen, Anna–Lena

doi:10.1016/j.conbuildmat.2018.12.215

Cited by 39 publications

(16 citation statements)

References 57 publications

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“…There are very few studies examining how the rheology of geopolymers or Portland cement composites is affected by MPCM addition. 15,18,34,35,36 Most previous studies only measure slump, which generally show that MPCM addition increase the water demand to obtain a constant slump value, 34,36 or analogously that adding microcapsules decrease the slump. 15,18,36 More thorough rheological investigations utilizing rheometers or viscosimeters are scarce.…”

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confidence: 99%

“…15,18,34,35,36 Most previous studies only measure slump, which generally show that MPCM addition increase the water demand to obtain a constant slump value, 34,36 or analogously that adding microcapsules decrease the slump. 15,18,36 More thorough rheological investigations utilizing rheometers or viscosimeters are scarce. 35,36 Shear rate dependencies of Portland cement paste containing MPCM has been examined, and it was found that the pastes went from shear thinning to shear thickening behavior when the amount of superplasticizer was increased.…”

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confidence: 99%

“…15,18,36 More thorough rheological investigations utilizing rheometers or viscosimeters are scarce. 35,36 Shear rate dependencies of Portland cement paste containing MPCM has been examined, and it was found that the pastes went from shear thinning to shear thickening behavior when the amount of superplasticizer was increased. 36 The time-dependent viscosities of geopolymer pastes containing three different MPCMs have been studied at a constant shear rate.…”

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confidence: 99%

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The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

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The effect of microencapsulated phase‐change materials (MPCM) on the rheological properties of pre‐set geopolymer and Portland cement mortars was examined. Microcapsules with hydrophilic and hydrophobic shells were compared. The shear rate dependency of the viscosities fitted well to a double Carreau model. The zero shear viscosities are higher for geopolymer mortar, illustrating poorer workability. The time evolution of the viscosities was explored at shear rates of 1 and 10 s−1. New empirical equations were developed to quantify the time‐dependent viscosity changes. The highest shear rate disrupted the buildup of the mortar structures much more than the lower shear rate. Microcapsules with a hydrophobic shell affect the rheological properties much less than the microcapsules with a hydrophilic shell, due to the higher water adsorption onto the hydrophilic microcapsules. Shear forces was found to break down the initial structures within geopolymer mortars more easily than for Portland cement mortars, while the geopolymer reaction products are able to withstand shear forces better than Portland cement hydration products. Initially, the viscosity of geopolymer mortars increases relatively slowly during due to formation of geopolymer precursors; at longer times, there is a steeper viscosity rise caused by the development of a 3D‐geopolymer network. Disruption of agglomerates causes the viscosities of portland cement mortars to decrease during the first few minutes, after which the hydration process (increasing viscosities) competes with shear‐induced disruption of the structures (decreasing viscosities), resulting in a complex viscosity behavior.

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The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

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“…A superplasticizer generally improves the flow behavior of cement slurries and provides highly amorphous hydrates [159]. It is observed that increasing the amount of a superplasticizer admixture increases the cement gelation threshold [160], while decreasing the yield stress and viscosity and delaying the cement hydration process [161][162][163][164]. These effects are not that obvious when the admixture concentration is higher than 0.75% or when the shear rate is high (>128 rpm).…”

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A Review of Rheological Modeling of Cement Slurry in Oil Well Applications

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The rheological behavior of cement slurries is important in trying to prevent and eliminate gas-migration related problems in oil well applications. In this paper, we review the constitutive modeling of cement slurries/pastes. Cement slurries, in general, behave as complex non-linear fluids with the possibility of exhibiting viscoelasticity, thixotropy, yield stress, shear-thinning effects, etc. The shear viscosity and the yield stress are two of the most important rheological characteristics of cement; these have been studied extensively and a review of these studies is provided in this paper. We discuss the importance of changing the concentration of cement particles, water-to-cement ratio, additives/admixtures, shear rate, temperature and pressure, mixing methods, and the thixotropic behavior of cement on the stress tensor. In the concluding remarks, we propose a new constitutive model for cement slurry, considering the basic non-Newtonian nature of the different models.

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“…(c) Many types of PCM result in wide distribution of phase change temperature range. Therefore, PCM have good application prospects like battery thermal management, solar heater, building (bricks and cement), industrial waste heat recovery systems, and textiles …”

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Thermal properties and characterization of palmitic acid/nano silicon dioxide/graphene nanoplatelet for thermal energy storage

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Palmitic acid (PA), nano silicon dioxide (nano SiO 2 ), and graphene nanoplatelets (GNPs) were fabricated to composite phase change materials (PCMs) for thermal energy storage. PA acted as PCM, nano SiO 2 was used as supporting material. GNP as thermal conductivity promoter was added to modify composite PCM. Nano SiO 2 has good adsorption property and can adsorb liquid PCM to prevent leakage. Leakage measurement indicated that PA maximum content in composite PCM is 70 wt%. Chemical and crystal structures, and microstructure of composite PCM were tested by Fourier transformation infrared spectroscope, X-ray diffractometer and scanning electronic microscope, which showed that the raw materials are well mixed by physical action. Differential scanning calorimeter result presented that composite PCM possess phase change temperature at about 60 C and latent heat of 128.42 kJ/ kg. Thermogravimetric analyzer and thermal cycle experiment showed that composite PCM have outstanding thermal stability and durability. Thermal conductivity apparatus measurement results indicated that thermal conductivity of composite PCM with 5 wt% GNP is 1.65 times that of composite PCM without GNP. Therefore, this composite PCM are potential materials for thermal energy storage. K E Y W O R D Scomposite phase change material, graphene nanoplatelet, nano silicon dioxide, thermal energy storage, thermal property

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Effect of microencapsulated phase change materials on the flow behavior of cement composites

Cited by 39 publications

References 57 publications

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

A Review of Rheological Modeling of Cement Slurry in Oil Well Applications

Thermal properties and characterization of palmitic acid/nano silicon dioxide/graphene nanoplatelet for thermal energy storage

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