scholarly journals Fungicidal effects on cement composites with recycled glass from photovoltaic panels

2021 ◽  
Vol 900 (1) ◽  
pp. 012019
Author(s):  
K Kučová ◽  
K Máčalová ◽  
V Václavík ◽  
T Dvorský ◽  
M Vašinková
Keyword(s):  
Ph Value ◽  
High Growth ◽  
Cement Composites ◽  
Photovoltaic Panels ◽  
High Ph ◽  
Solid Structure ◽  
Recycled Glass ◽  
Natural Aggregate ◽  
Monitoring Time ◽  
Large Production

Abstract This research was focused on the effects of micromycetes on cement composites with 100% replacement of natural aggregate by the recycled glass from photovoltaic panels. The experiment was performed on samples of small beams measuring 40 x 40 x 8 mm (length x width x height) and cement crumbling with recycled glass from photovoltaic panels in percentages representing 10%, 20% and 40%. The representatives of the selected micromycetes were Aspergillus niger, A. clavatus, Penicillium glabrum, Cladosporium sp. and Zygomycetes sp. Biocorrosion causes changes in the properties of the material, mainly as a result of the action of microorganisms. Due to their large production of acids and enzymes, micromycetes are an important part of microscopic consortia involved in biocorrosion. This experiment focused on evaluating the effect of micromycetes on cement composites – solid structure and crumbling, with 100% replacement of natural aggregate with photovoltaic glass recyclate. The results show a high growth of biomass on solid composites, while on cement crumbling, the growth was minimal due to high pH value. Longer monitoring time was used in case of adaptation to the environment.

scholarly journals Algae as a part of microorganisms involved in biocorrosion of cement composites with total replacement of natural aggregates by photovoltaic glass

2021 ◽  
Vol 900 (1) ◽  
pp. 012022
Author(s):  
K Máčalová ◽  
K Kučová ◽  
V Václavík ◽  
T Dvorský ◽  
J Charvát ◽  
...  
Keyword(s):  
Ph Value ◽  
Cement Composites ◽  
Minimal Growth ◽  
Photovoltaic Panels ◽  
Recycled Glass ◽  
Total Replacement ◽  
Zero Growth ◽  
Natural Aggregates ◽  
Intensive Growth

Abstract Algae of the Pleurococcus, Trentepohlia and Stichococcus genera were selected for the experiment on the cement composites with total replacement of natural aggregates by recycled photovoltaic glass. The growth of the algae was monitored on cement beams with dimension 40 x 40 x 8 mm (length x width x height) and on the cement crumbling in various proportion. In the case of cement composites with recycled glass from photovoltaic panels, intensive growth was observed in the Trentepohlia genus from the Chlorophyceae class, while in the case of cement crumbling with recycled photovoltaic glass, the most obvious growth in biomass was recorded in the Pleurococcus genus; the Stichococcus and Trentepohlia genera showed minimal or zero growth. This minimal growth is mainly influenced by the pH value and the fact that biocorrosion is accompanied by the effect of symbiotizing microbiota, which mutually support each other, not just one species.

scholarly journals The Use of Glass from Photovoltaic Panels at the End of Their Life Cycle in Cement Composites

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6655
Author(s):  
Kateřina Máčalová ◽  
Vojtěch Václavík ◽  
Tomáš Dvorský ◽  
Róbert Figmig ◽  
Jakub Charvát ◽  
...  
Keyword(s):  
Czech Republic ◽  
Life Cycle ◽  
Raw Materials ◽  
Cement Composite ◽  
Cement Composites ◽  
Solar Panels ◽  
The Czech Republic ◽  
Photovoltaic Panels ◽  
Recycled Glass ◽  
Secondary Raw Materials

This article deals with the use of photovoltaic panels at the end of their life cycle in cement composites. Attention is focused on the properties of cement composite after 100% replacement of natural aggregate with recycled glass from photovoltaic panels. This goal of replacing natural filler sources with recycled glass is based on the updated policy of the Czech Republic concerning secondary raw materials for the period of 2019–2022, which aims to increase the self-sufficiency of the Czech Republic in raw materials by replacing primary sources with secondary raw materials. The policy also promotes the use of secondary raw materials as a tool to reduce the material and energy demands of industrial production and supports the innovations and development of a circular economy within business. The research has shown that it is possible to prepare cement composite based on recycled glass from solar panels, with compressive and flexural strength after 28 days exceeding 40 MPa and 4 MPa. Furthermore, a possible modification of the cement composite with different pigments has been confirmed, without disrupting the contact zone.

scholarly journals Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires

2021 ◽  
Vol 11 (6) ◽  
pp. 2725
Author(s):  
Jakub Svoboda ◽  
Tomáš Dvorský ◽  
Vojtěch Václavík ◽  
Jakub Charvát ◽  
Kateřina Máčalová ◽  
...  
Keyword(s):  
Building Materials ◽  
Absorption Capacity ◽  
Acoustic Properties ◽  
Strength Characteristics ◽  
Cement Composites ◽  
Waste Tires ◽  
Natural Aggregate ◽  
Thermal Insulating ◽  
Recycled Rubber ◽  
Insulating Properties

This article describes an experimental study aimed at investigating the potential use of recycled rubber granulate from waste tires of fractions 0/1 and 1/3 mm in cement composites as a 100% replacement for natural aggregates. The use of waste in the development and production of new building materials represents an important aspect for the sustainability and protection of the environment. This article is focused on the sound-absorbing and thermal-insulating properties of experimental cement composites based on recycled rubber from waste tires. The article describes the grain characteristics of recycled rubber, sound absorption capacity, thermal conductivity and strength characteristics. The results of this research show that the total replacement of natural aggregate with recycled rubber in cement composites is possible. Replacing natural aggregate with recycled rubber has significantly improved the thermal and acoustic properties of the prepared cement composites, however, at the same time; there was also the expected decrease in the strength characteristics due to the elasticity of rubber.

Magnesium hydroxide coagulation performance and floc properties in treating high pH reactive orange wastewater

2015 ◽  
Vol 71 (9) ◽  
pp. 1310-1316 ◽  
Author(s):  
Meile Liu ◽  
Jingfang Lu ◽  
Lei Wei ◽  
Kang Wang ◽  
Jianhai Zhao
Keyword(s):  
Magnesium Hydroxide ◽  
Ph Value ◽  
Particle Dispersion ◽  
Magnesium Ion ◽  
Feeding Mode ◽  
High Ph ◽  
Coagulation Performance ◽  
Initial Ph ◽  
Floc Properties ◽  
Reactive Orange

Application of magnesium hydroxide as a coagulant for treating high pH reactive orange wastewater was studied. The coagulation performance and magnesium hydroxide-reactive orange floc properties were investigated under different dosages, feeding modes and pH values. Flocculation index (FI) was then discussed with controlled experiments using an intelligent particle dispersion analyzer and optimum coagulant dose of 150 mg/L (magnesium ion) was obtained for pH value 12. The results showed that the optimum magnesium ion dose tended to decrease with the increase of initial pH value. One time addition feeding mode led to relatively large FI value and higher removal efficiency compared with other addition modes. All of the flocs under investigation showed a limited capacity for re-growth when they had been previously broken. Based on the changes of zeta potential and floc properties, charge neutralization and precipitate enmeshment were proposed to be the main coagulation mechanisms.

Physical and Biological Conditions in Heavily Fertilized Water

1934 ◽  
Vol 1 (1) ◽  
pp. 67-93 ◽  
Author(s):  
M. W. Smith
Keyword(s):  
Oxygen Content ◽  
Ph Value ◽  
Cow Manure ◽  
Light Conditions ◽  
Concrete Walls ◽  
Number Of Species ◽  
Large Production ◽  
Experimental Pond

The physical and biological conditions in an experimental pond with concrete walls containing 33 cubic metres of water, initially fertilized with approximately 450 kg. (1000 lb.) of cow manure, were studied intermittently during four years. There was a large production of plankton, but it was subject to marked and sudden fluctuations, and the number of species found was not large. The fertilization caused extreme variations in the light conditions, oxygen content and pH value of the water.

Influence of pH on the Morphology of Yttrium Oxide Hydroxide Nitrate Nanocrystal

2007 ◽  
Vol 336-338 ◽  
pp. 2176-2178 ◽  
Author(s):  
Zhang Lian Hong ◽  
Huang Guo ◽  
Li Xia Peng ◽  
Min Quan Wang
Keyword(s):  
Hydrothermal Method ◽  
Yttrium Oxide ◽  
Ph Value ◽  
High Ph ◽  
Ph Values ◽  
Starting Solution ◽  
Primary Mechanism ◽  
Oxide Hydroxide ◽  
Influence Of Ph

Yttrium oxide hydroxide nitrate (Y4O(OH)9NO3), which was prepared by polyvinyl alcoholassisted hydrothermal method from the Y(NO3)3 and KOH starting solution, was characterized by XRD and FE-SEM. The results revealed that pH value of the starting solution is an important factor which determines the morphology and size of the products. The obtained products varied from lamina microprisms to circular nanorods when the pH value increased from 7.0 to 8.0. In the high pH value above 8.0, the size of nanorods decreased with increasing pH value. A primary mechanism was proposed to explain the evolution of morphology and size of Y4O(OH)9NO3 products prepared under various pH values.

Radiolysis of 2,2',3,3',4,4',5,5',6,6'-Bromdiphenyl Ether Solutions by UV and Electron Beams

2011 ◽  
Vol 356-360 ◽  
pp. 614-619
Author(s):  
Wen Yan Shi ◽  
Jian Zhong Gu ◽  
Wen Jing Wu ◽  
Yan Feng Sun ◽  
Rui Yun Guo ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Organic Compounds ◽  
High Efficiency ◽  
Ph Value ◽  
Electron Beams ◽  
High Rate ◽  
Decomposition Rates ◽  
Absorbed Energy ◽  
High Ph ◽  
Bde 209

2,2',3,3',4,4',5,5',6,6'-bromdiphenyl ether (BDE-209) solutions were irradiated with ultraviolet (UV) and electron beams. Organic compounds were fully removed by each type of radiation. The absorbed energy of the ionizing radiation (electron beams) needed for removal was much lower than that of UV photocatalysis. BDE-209 removal using the ionizing radiation was accelerated drastically by dosage. It is suggested that pH value of solution affect the decomposition rates. Radiolysis with the high pH value showed consistently high rate and high efficiency of BDE-209 removal.

scholarly journals Corrosion on prestressing wires due to segregation of the injection mortar – Detection of injection defects with Ultrasonic-Echo Technique

2018 ◽  
Vol 199 ◽  
pp. 06008 ◽  
Author(s):  
Christian Sodeikat ◽  
Klaus Mayer ◽  
Philipp Obermeier
Keyword(s):  
Hydrostatic Pressure ◽  
Phase Shift ◽  
High Hydrostatic Pressure ◽  
Ph Value ◽  
Electrochemical Potential ◽  
High Ph ◽  
Ultrasonic Echo ◽  
Shift Technique

Unsuitable granulometry of injection mortar can promote segregation if high hydrostatic pressure impacts on the mortar for longer time during hardening. Endangered for segregation are long perpendicular prestressing tendons e.g. used in high towers due to the high hydrostatic pressure inside. The segregation causes an accumulation of water and solved ions on top of the tendons. In this area an extremely high pH-value and a very low electrochemical potential occurs. This environment is extremely corrosive and can cause wire breaks within only few months. With the Ultrasonic-Echo Technique (Flaw Detectors) it is possible to detect injection defects by using the phase shift technique.

scholarly journals Rhodamine 6G hydrazone with coumarin unit: a novel single-molecule multianalyte (Cu2+ and Hg2+) sensor at different pH value

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42312-42319 ◽  
Author(s):  
Zhou-Qing Xu ◽  
Xian-Jie Mao ◽  
Yuan Wang ◽  
Wei-Na Wu ◽  
Pan-Dong Mao ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Single Molecule ◽  
Fluorescence Enhancement ◽  
Rhodamine 6G ◽  
Ph Value ◽  
Aqueous Media ◽  
High Ph ◽  
Ratiometric Fluorescent Probe

An effective colourimetric and ratiometric fluorescent probe for Cu2+ in neutral aqueous media was synthesised. Moreover, the probe could sense Hg2+ with fluorescence enhancement at high pH.

Synthesis of Push-Pull Phenazines Possessing pH-Responsive Absorption Spectra and their Application in Selective Detection of Fe3+ Ions and Aromatics

Synlett ◽  
2018 ◽  
Vol 29 (08) ◽  
pp. 1014-1019 ◽  
Author(s):  
Subhadeep Banerjee ◽  
Apeksha Phadte ◽  
Anjan Chattopadhyay ◽  
P. Bhavana ◽  
Keisham Singh
Keyword(s):  
Ph Value ◽  
Theoretical Calculations ◽  
Oxidation Potential ◽  
Selective Detection ◽  
Ph Sensing ◽  
Ph Responsive ◽  
Spectrophotometric Detection ◽  
High Ph ◽  
Ph Values ◽  
Internal Charge Transfer

Phenazines bearing electron-donor and electron-acceptor groups with high pH-sensing behavior were synthesized in moderate to good yields. Theoretical calculations on the frontier molecular orbitals and experimental oxidation potential measurements under variable pH values provide evidence for extensive internal charge transfer at high pH value. The well-known strong affinity of the catecholate moiety present in our phenazines is utilized for spectrophotometric detection of Fe3+ ion. Fluorescence-quenching behavior of the prepared phenazines is utilized for detection and distinction of electron-rich and electron-poor aromatics.

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