Properties of Old Concrete Built in the Former Leipziger Palace

Ambroziak, Andrzej; Haustein, Elżbieta

doi:10.3390/ma15020673

Cited by 7 publications

(5 citation statements)

References 53 publications

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“…Due to a lack of standard guidelines for the freezer of coated woven fabrics the freezer cycle was performed according to the PN-B-06250 standard [30]. This standard is used generally for the determination of concrete frost resistance [31][32][33]. The single freezer cycle consisted of freezing at −18 ± 2 • C for 4 h and thawing by full immersion in water at +18 ± 2 • C for 4 h. After the specified number of freezer cycles, the fabric specimens were air-dried at in-room temperature for one week and then subjected to mechanical tests.…”

Section: Methodsmentioning

confidence: 99%

Influence of cyclic frozen and defrost on mechanical properties of polytetrafluoroethylene (PTFE)-coated woven fabrics

2023

Archives of Civil Engineering

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This research aims to determine the influence of the cyclic process of freezing and defrosting on the mechanical properties of the chosen glass fibres and PTFE-coated woven fabrics. The specimens were subjected to freezing at about −20 • C for 4 h and thawing by full immersion into the water at about +20 • C for 4 h. The fabric samples after 25 and 50 frozen cycles were air-dried at room temperature for one week and then subjected to uniaxial tensile tests. The same tests have been performed on a reference group of specimens, which were not exposed to temperature change. The authors determined the tensile strength, and longitudinal stiffnesses resulting from performed tests. Although the investigated coated woven fabrics expressed a reduction in the tensile strength in water soaking conditions, the performed frozen cycles don't show a significant decrease in strength under uniaxial tensile tests.

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Section: Methodsmentioning

confidence: 99%

Influence of cyclic frozen and defrost on mechanical properties of polytetrafluoroethylene (PTFE)-coated woven fabrics

2023

Archives of Civil Engineering

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“…The loss on ignition (LOI) was identified according to EN 196-2 [39]. The application of this technique allows us to determine the chemical composition of cementitious materials and the microstructure of concrete [40][41][42].…”

Section: Methodsmentioning

confidence: 99%

“…The raw XRD data obtained from the spectrometer were analyzed by PDXL software. The test results are presented in Section 3.6 [42].…”

Section: Methodsmentioning

confidence: 99%

Influence of Cement Replacement with Sewage Sludge Ash (SSA) on the Heat of Hydration of Cement Mortar

et al. 2022

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The amount of fly ash from the incineration of sewage sludge is increasing all over the world, and its utilization is becoming a serious environmental problem. In the study, a type of sewage sludge ash (SSA) collected directly from the municipal sewage treatment plant was used. Five levels of cement replacement (2.5%, 5%, 7.5%, 10% and 20%) and unchanged water-to-binder (w/b) ratio (0.55) were used. The purpose of the study was to evaluate the effect of sewage sludge ash (SSA) on the hydration heat process of cement mortars. The heat of the hydration of cement mortars was monitored by the isothermal calorimetric method for 7 days at 23 °C. The analysis of chemical composition and particle size distribution was performed on the tested material. The tests carried out have shown that SSA particles have irregular grain morphology and, taking into account the chemical composition consists mainly of oxides such as CaO, P2O5, SiO2 and Al2O3. The concentration of these compounds affects the hydration process of cement mortars doped with SSA. In turn, the content of selected heavy metals in the tested ash should not pose a threat to the environment. Calorimetric studies proved that the hydration process is influenced by the presence of SSA in cement mortars. The studies showed that the rate of heat generation decreased (especially in the initial setting period) with the increasing replacement of cement by SSA, which also reduced the amount of total heat compared to the control cement mortar. With increasing mass of the replacement of cement with SSA up to 20%, the 7-day compressive strength of the mortar samples decreases.

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“…Much effort has not been made to recycle PTFE-coated baking sheets. However, several approaches, including hydrothermal treatment [23] , solvent-based methods [24] , physical separation [25] , and depolymerization [26] , are proposed to break down or separate PTFE coating from the fabrics. Meanwhile, in this work, these PTFE-coated baking sheets are directly reused for the fabrication of TENG after cleaning and disinfection.…”

Section: Introductionmentioning

confidence: 99%

Diaper Waste Recycling Towards a Triboelectric Nanogenerator based Weather Station: An Innovative Solution for Sustainable Energy Generation

Basith,

Ramadoss,

Khandelwal

et al. 2024

Preprint

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The escalating concerns surrounding waste management worldwide and the pressing need for sustainable energy sources have prompted innovative solutions at the nexus of resource recycling and self-powered applications. Diapers are disposed of after use in modern society, and widely available diapers are not environmentally friendly, thus posing a significant threat to the environment. According to the United Nations Environment Programme (UNEP) 2023 report, around 250 million single-use diapers are thrown out daily across the globe. This research presents a pioneering approach to recycling super absorbent polymer (SAP) gels from waste diapers and using them alongside discarded baking sheets to fabricate a maraca-resembled Diaper Waste-based Triboelectric Nanogenerator (DW-TENG). The fabricated DW-TENG is demonstrated for developing a self-powered weather station, enabling real-time wind speed, humidity, and temperature monitoring. The manuscript details the intricate fabrication of the DW-TENG, elucidating design considerations, assembly processes, and the unique roles of SAP powder and baking sheets in the triboelectric energy generation mechanism. In addition, our study quantifies the potential global impact of diaper recycling on energy generation. Based on the calculations, a 4.72 MW power generation is expected yearly, considering the yearly diaper disposal rates. The work highlights the transformative impact of recycling practices for energy generation and represents a promising stride toward a circular and sustainable future.

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Properties of Old Concrete Built in the Former Leipziger Palace

Cited by 7 publications

References 53 publications

Influence of cyclic frozen and defrost on mechanical properties of polytetrafluoroethylene (PTFE)-coated woven fabrics

Influence of cyclic frozen and defrost on mechanical properties of polytetrafluoroethylene (PTFE)-coated woven fabrics

Influence of Cement Replacement with Sewage Sludge Ash (SSA) on the Heat of Hydration of Cement Mortar

Diaper Waste Recycling Towards a Triboelectric Nanogenerator based Weather Station: An Innovative Solution for Sustainable Energy Generation

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