Up-scaling and performance assessment of façade panels produced from construction and demolition waste using alkali activation technology

Frankovič, Ana; Ducman, Vilma; Dolenec, Matej; Panizza, Matteo; Tamburini, S.; Natali, Marco; Παππά, Μαρία; Tsoutis, Constantinos; Bernardi, Adriana

doi:10.1016/j.conbuildmat.2020.120475

Cited by 14 publications

(10 citation statements)

References 29 publications

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“…The HTF loops contained a mixture of water-glycol at 30% glycol concentration in the lab-scale and at 10% in the full-scale set-up, at a temperature above the PCM melting point. The thermo-physical properties of the HTF used in the lab-scale set-up according to the manufacturer [23] For the aluminum, the value of 900 J•kg −1 •K −1 was used for the specific heat capacity [30]. Moreover, both modules were insulated with 120 mm of mineral wool, with thermal conductivity k = 0.04 W•m −1 •K −1 and density of 60 kg•m −3 [31] and 65 kg•m −3 [32] for the full-scale and the lab-scale modules, respectively.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…For the discharging process, the energy performance (ε ch ) was evaluated according to Equation (23).…”

Section: Definition Of the Performance Indicators (Pis) Consideredmentioning

confidence: 99%

“…The modelling for scaling up/down of the system is based in this case on similarities in the dimensionless group that describe the phenomenon (Reynolds number, Grashof number, Froude number, and Richardson number). In [23], the Six-Sigma methodology was used to go from lab-scale testing to pilot production by converting the outcome of the "Basic Flow Sheet" to a "Detailed Design", with modelling simulations for all the production-critical tasks and their engineering implementation.…”

Section: Introductionmentioning

confidence: 99%

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A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

et al. 2021

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A clear gap was identified in the literature regarding the in-depth evaluation of scaling up thermal energy storage components. To cover such a gap, a new methodological approach was developed and applied to a novel latent thermal energy storage module. The purpose of this paper is to identify some key aspects to be considered when scaling up the module from lab-scale to full-scale using different performance indicators calculated in both charge and discharge. Different normalization methods were applied to allow an appropriate comparison of the results at both scales. As a result of the scaling up, the theoretical energy storage capacity increases by 52% and 145%, the average charging power increases by 21% and 94%, while the average discharging power decreases by 16% but increases by 36% when mass and volume normalization methods are used, respectively. When normalization by the surface area of heat transfer is used, all of the above performance indicators decrease, especially the average discharging power, which decreases by 49%. Moreover, energy performance in charge and discharge decreases by 17% and 15%, respectively. However, efficiencies related to charging, discharging, and round-trip processes are practically not affected by the scaling up.

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Section: Materials Propertiesmentioning

confidence: 99%

“…For the discharging process, the energy performance (ε ch ) was evaluated according to Equation (23).…”

Section: Definition Of the Performance Indicators (Pis) Consideredmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

et al. 2021

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“…To overcome this problem, Mastali et al [34] replaced the additional amount of water (absorbed by the aggregates during mixing) with an equivalent quantity of the alkali-activator, which resulted in a slight decrease in the fluidity of the mixture, with a limited aggregate segregation and a noticeable improvement in strength. For their part, Frankovic et al [35] indicated that the adding short plastic fibres improves the behaviour of concrete towards shrinkage-induced cracks.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Metakaolin/Slag-Based Geopolymer Mortars Incorporating Natural and Recycled Sands

2022

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Great efforts are being made to minimize the negative impact of the Portland cement industry on the environment by using industrial by-products during the manufacture of clinker or by the partial replacement of cement during the preparation of concrete. However, the carbon footprint remains relatively high in addition to the large consumption of natural resources such as sand and other aggregates. A solution to these problems is to completely replace Portland cement with a new generation of mineral binders, commonly known as geopolymers, which have properties similar to those of Portland cement. These binders can be obtained by the alkali-activation of siliceous or aluminosilicate materials. This study aims to develop pozzolanic type binders at room temperature (20°C) from the alkali-activation of aluminosilicate materials based on metakaolin and blast furnace slag at different percentages. Different activators were employed, including solid (NaOH) and liquid (Na2SiO3.nH2O). The optimal mixtures were used for making mortars based on natural sand (NS) and concrete recycled sand (CRS). A comparative experimental study of the physical, mechanical, and microstructural characteristics of the two types of mortars was conducted. Cement mixtures with a high amount of slag and an association of sodium hydroxide and sodium silicate gave the best physico-mechanical properties. A drop in the compressive strength of mortars prepared with CRS was observed after 365 days, but it was still higher than those with NS. The obtained results show the possibility of designing an eco-friendly CRS-based geopolymer mortar that is more resistant than NS-based mortar with a homogeneous and integrated microstructure. Doi: 10.28991/CEJ-2022-08-08-07 Full Text: PDF

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“…The aging test is usually carried out according to the indoor accelerated environmental conditions required. Subsequently, the changes in the microstructure and physical or mechanical properties of the external wall insulation materials or test specimens after aging are evaluated [20][21][22][23]. Xiong et al [24] carried out 160 heat-rain cycles on expanded perlite mortar and analyzed the pore structure evolution, water absorption, and moisture absorption characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on water absorption and mechanical properties of expanded perlite mortar under accelerated and natural aging conditions

Yuan

Xiong

et al. 2022

Mater. Res. Express

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The objective of this paper is to study the variation in the physical and mechanical properties of expanded perlite mortar with environmental factors and analyze its deterioration mechanism. In this paper, the influence of the heat-rain cyclic and natural aging on the physical and mechanical properties of expanded perlite mortar has been studied. The expanded perlite mortar specimens were subjected to 80 heat-rain cycles (the maximum temperature rises to 70℃, and the spray volume reaches 1 L/(m² min)) and 60-day natural aging tests (the daily average temperature is 23°C, with the maximum temperature reaching 36°C). The corresponding mass loss rate, water absorption, and compressive strength of the specimens at every 10 heat-rain cycles and 10 days were determined. The results show that the mass loss rate gradually increases with the increase in heat-rain cycles and the natural aging days. The variation range was found as about 0.2%~0.7% and -0.4%~0.2%, respectively. The water absorption rate gradually decreases with the number of heat-rain cycles and natural aging days; however, the decay rate of the water absorption rate differs by orders of magnitude in the two weathering conditions. The compressive strength does not have an obvious change with the number of heat rain cycles, but it first increases and then decreases with the number of natural aging days. Under artificial and natural aging, the deterioration mechanism and aging speed of expanded perlite mortar are much different. The comparative analysis of the physical and mechanical properties of expanded perlite mortar under artificially accelerated and natural aging conditions can further reveal its evolution model and the corresponding relationships under the two conditions and provide a theoretical basis for establishing a more scientific and reasonable aging system.

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Up-scaling and performance assessment of façade panels produced from construction and demolition waste using alkali activation technology

Cited by 14 publications

References 29 publications

A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

A New Methodological Approach for the Evaluation of Scaling Up a Latent Storage Module for Integration in Heat Pumps

A Comparative Study of Metakaolin/Slag-Based Geopolymer Mortars Incorporating Natural and Recycled Sands

Experimental investigations on water absorption and mechanical properties of expanded perlite mortar under accelerated and natural aging conditions

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