scholarly journals Effects of Particle Size and Cement Replacement of LCD Glass Powder in Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Seong Kyum Kim ◽  
Su Tae Kang ◽  
Jin Kwang Kim ◽  
Il Young Jang
Keyword(s):  
Particle Size ◽  
Glass Powder ◽  
Liquid Crystal Display ◽  
Waste Recycling ◽  
Cement Industry ◽  
Hardened Concrete ◽  
National Scale ◽  
The Sustainable Development ◽  
Technological Level ◽  
And Performance

The high quality liquid crystal display (LCD) processing waste glass (LPWG) generated from the manufacturing process of Korea’s LCD industries, having the world’s highest technological level and production, was finely ground into particles smaller than cement particles (higher fineness than OPC) to verify their applicability and performance as a replacement for cement. For a concrete mix having a W/B ratio of 0.44, cement was replaced with LPWG glass powder (LGP) at ratios of 5, 10, 15, and 20% (LGP12) and 5 and 10% (LGP5) according to the particle size to prepare test cylinder specimens, which were tested with respect to air contents, slump in fresh concrete, and compressive strength and splitting tensile strength of hardened concrete. The microstructure of the concrete specimens was analyzed through Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), and a Mercury Intrusion Porosimetry (MIP). Replacement of cement with LGP for cement could effectively decrease the quantity of cement used due to the excellent performance of LGP. It may positively contribute to the sustainable development of the cement industry as well as waste recycling and environment conservation on a national scale.

Use of Glass Powder and Sand Dune in Concrete: Characterization and Performance

2021 ◽  
Vol 406 ◽  
pp. 521-531
Author(s):  
Sofiane Saggai ◽  
Wafa Bouaka ◽  
Amira Benhaddou ◽  
Ibtissam Belaid
Keyword(s):  
Glass Powder ◽  
Sound Propagation ◽  
Cement Industry ◽  
Waste Reduction ◽  
Dune Sand ◽  
Glass Waste ◽  
Waste Glass Powder ◽  
Alluvial Sand ◽  
And Performance ◽  
Concrete Characterization

Cement and alluvial sand are very essential materials in concrete preparation. The first material production contributes to the emissions of greenhouse gases, in particular carbon dioxide (CO2), and the extensive exploitation of second material constitutes a danger on the extinction of its deposits. The use of waste glass powder (WGP) to partially replace cement and dune sand as a replacement for a small amount of alluvial sand appears as a potential solution that solves several problems at once (disposal of glass waste, reduction of emissions gas and preservation of construction sand deposits). The objective of this study is to verify the effects of these partial replacements on concrete properties, their cost, and the CO2 emission reduction in the atmosphere. For this, three types of concrete are prepared: a control (0% of WGP); mixture 1 (10% WGP); and mixture 2 (20% WGP). In all three types, 5% of alluvial sand is replaced by dune sand. Obtained results show that these partial replacements do not affect the porosity (less than 20%), they give good indices as to the speed of sound propagation in the concrete (up to 3500 m/s), especially for the case of the second mixture after 56 days but this does not increase the concrete performance concerning compressive strength and performance of concrete with glass is less than that of control concrete. Economically, the reduction of 10% in cement saves 5 € per ton and environmentally, it reduces the emission of CO2 from cement industry by 0.5 to 0.7% of total anthropogenic CO2 emissions.

scholarly journals Effects after 1500 Hardening Days on the Microstructure and Durability-Related Parameters of Mortars Produced by the Incorporation of Waste Glass Powder as a Clinker Replacement

2021 ◽  
Vol 13 (7) ◽  
pp. 3979
Author(s):  
Rosa María Tremiño ◽  
Teresa Real-Herraiz ◽  
Viviana Letelier ◽  
Fernando G. Branco ◽  
José Marcos Ortega
Keyword(s):  
Diffusion Coefficient ◽  
Water Absorption ◽  
Glass Powder ◽  
Cementitious Materials ◽  
Cement Industry ◽  
Waste Glass ◽  
Supplementary Cementitious Materials ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Waste Glass Powder

One of the ways of lessening the CO2 emissions of cement industry consists of replacing clinkers with supplementary cementitious materials. The required service life of real construction elements is long, so it is useful to characterize the performance of these materials in the very long term. Here, the influence of incorporating waste glass powder as a supplementary cementitious material, regarding the microstructure and durability of mortars after 1500 hardening days (approximately 4 years), compared with reference mortars without additions, was studied. The percentages of clinker replacement by glass powder were 10% and 20%. The microstructure was studied using impedance spectroscopy and mercury intrusion porosimetry. Differential thermal and X-ray diffraction analyses were performed for assessing the pozzolanic activity of glass powder at the end of the time period studied. Water absorption after immersion, the steady-state diffusion coefficient, and length change were also determined. In view of the results obtained, the microstructure of mortars that incorporated waste glass powder was more refined compared with the reference specimens. The global solid fraction and pores volume were very similar for all of the studied series. The addition of waste glass powder reduced the chloride diffusion coefficient of the mortars, without worsening their behaviour regarding water absorption after immersion.

EXPERIENCE OF USING THE CLUSTER APPROACH IN ASSESSING THE SUSTAINABLE DEVELOPMENT OF THE MOUNTAINOUS TERRITORIES OF THE NORTH CAUCASUS

2021 ◽  
Vol 1 (11) ◽  
pp. 37-46
Author(s):  
Rita I. Batyaeva ◽  
◽  
Tat’yana G. Shelkunova ◽  
Irina Yu. Khetagurova ◽  
Tamara G. Khetagurova ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Economic Development ◽  
Social Indicators ◽  
Federal District ◽  
North Caucasus ◽  
Mountain Areas ◽  
The Sustainable Development ◽  
The North ◽  
Technological Level ◽  
National Environmental

The article provides an overview of the effects of the resonant impact of clusters on the ability of mountain areas to adapt to the modern realities of the technological level, as well as the ability to apply innovations, attract investment in the agro-industrial and tourist cluster. A panel of indicators is presented that provides correct comparability of achievements and reflects information for aggregation by various parameters of the economic and geographical indicators of the region: the national environmental rating of the subjects of the North Caucasus Federal District; indicators of sustainable development of the Russian Federation and the North Caucasus Federal District; investment risk of the republics of the North Caucasus Federal District; the main economic and social indicators of the RSO-Alania. It is established that the geoinformation study of the use of a multicomponent indicator of the state of mountain territories is the basis for determining the vector of their further socio-economic development and justifying appropriate management decisions to stabilize economic development. The peculiarity of the approach is the selection of criteria that will be used in the development of mechanisms for the sustainable development of mountain territories according to the target indicators, in accordance with the UN resolution "Transforming our world in the field of sustainable develop-ment for the period up to 2030".

Research on Mining Technology of Communication Data Stream Based on Computer Network Multimedia

2013 ◽  
Vol 427-429 ◽  
pp. 2094-2098
Author(s):  
Yang Li
Keyword(s):  
Data Stream ◽  
System Analysis ◽  
Data Flow ◽  
Computer Network ◽  
Strong Shock ◽  
Multimedia Communication ◽  
Mining Technology ◽  
The Sustainable Development ◽  
And Performance ◽  
The Impact

According to the application of the computer network multimedia is more and more widely, and is also correspondingly strong shock by the network media and informatization for network communication and other requirements, progress and development of society constantly threatened by the impact of network multimedia communication. The paper theory-based with network multimedia communication to analysis the characteristics and performance requirements of network multimedia communication, combining to relevant material of the data flow, research and analyze the data flow of the mining technology, to carries on system analysis of the data flow, construct system model based on the network multimedia communication data stream, in order to better guide the dynamic analysis to network multimedia communication data flow, to master the multimedia communication data fusion and decision, so as to understand the users needs to network multimedia communication, to better guide the sustainable development of the network multimedia communication.

scholarly journals تأثير إستخدام خبث أفران مجموعة جياد الصناعية على جودة الخرسانة

2021 ◽  
Vol 9 (2) ◽  
pp. 1-6
Author(s):  
علي حسين محمد علي ◽  
الطيب عبداللطيف أحمد حبيب
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Hardened Concrete ◽  
Gradual Reduction ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Artificial Materials ◽  
Percent Increase ◽  
And Performance ◽  
Furnace Slag

The need to produce high performance concrete led the researchers to try to exploit the potentialities of natural or artificial materials so as to improve the properties and performance of concrete. Slag is an industrial disposal which considered as a secondary product of pig-iron, these disposal will cause a severe harm to the environment in case of not get rid of it. In this investigation iron furnace slag which is produced at Giad Group - Iron Factory has been used as an alternative of proportion on cement after being processed, since its main oxides are similar to those of cement. In the practical part of our research slag has been added to the concrete mix in two ways, first by using it to replace as cement by weight as a substitutions of cement in different percent [10, 20, 30]% without changing in water-cement ratio [W/C], second by using the slag with the same previous percentage in addition to [15, 25]% to replace cement with reducing in water-cement ratio [W/C], and in addition superplasticizer [SP 901] has been added as percent from cement used in the mixture. The effect of slag was studied on the properties of fresh and hardened concrete including slump test and compressive strength in [7, 14, 28] days were investigated. The results show improvement in all concrete specimens for the added percentage of the slag as replacement materials and the addition of superplasticizer in the production of concrete and improvement in its properties. However, there is a gradual reduction in slump measurements due to slag percent increase in case of the two methods.  

scholarly journals Глобальные города: многокритериальная оценка устойчивого развития

2019 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
И.А. Шмелева ◽  
С.Э. Шмелев
Keyword(s):  
New York ◽  
Los Angeles ◽  
San Francisco ◽  
Smart City ◽  
Carbon Tax ◽  
Waste Recycling ◽  
Global Cities ◽  
Policy Makers ◽  
Strategic Direction ◽  
And Performance

A new strategic direction for greening our cities and making them smart to reduce the environmental impact of their performance, increase employment and economic viability and to enhance the quality of life requires a thorough assessment of sustainability and smart urban performance. The research presented in this paper is based on data on 143 global cities including London, New York, Hong Kong, San Francisco, Los Angeles, Sao Paolo, Rio de Janeiro, Buenos Aires, Paris, Berlin, Stockholm, Moscow, Beijing, Seoul, Singapore, Shanghai, Sydney and Tokyo. Exploring linkages between different sustainability and smart city dimensions, this study applied a multi-criteria approach using a panel of 20 indicators to assess urban sustainability performance of global cities. The assessment focused on the drivers of CO2 emissions in cities, including important aspects of energy transitions, the share of coal in the energy mix and renewable energy, public transport, cycling patterns and pedestrianization, waste recycling as well as carbon tax. The results show that San Francisco leads in economic and environmental priorities, and Stockholm leads insocial and smart city priorities. Seoul consistently performs very successfully across the whole spectrum of indicators. We devote considerable attention to the strategies, policies and performance of the leading cities, namely, San Francisco, Stockholm and Seoul. This assessment could be a valuable tool for policy-makers and investors, and could help identify linkages between different sustainability dimensions, as well as sustainable development potential and investment opportunities in cities.

Effect the Ratio and Particle Size of Glass Powder from Fluorescent Tubes Waste on Electrical Properties of PVA-Glass Composites

2021 ◽  
Vol 19 (10) ◽  
pp. 106-114
Author(s):  
Hani M Hussien
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Dielectric Constant ◽  
Glass Powder ◽  
Dissipation Factor ◽  
Powder Particle Size ◽  
Casting Method ◽  
Glass Composites ◽  
Mixing Ratios ◽  
Solution Casting Method

The polymer composites used in the present study were made of polyvinyl alcohol (PVA) as a matrix and glass powder as a filler. The glass powder was obtained from fluorescent tubes waste. The solution casting method was used to fabricate PVA/glass powder composite. Three groups of samples were prepared. The first was prepared by using PVA with the addition of glass powder (sieved less than 20 μm) in proportions 10, 20, 30, 40, and 50 %. The second: the mixing ratios of PVA and glass powder were 80% and 20%, respectively. The third: The mixing ratios of PVA and glass powder were 60% and 40%, respectively. In Both previous groups, the added glass powder used was sieved with sizes less than 20, 45, 105, and 125 μm. For all samples, the following properties were measured at room temperature: DC electrical conductivity, dielectric constant, electrical conductivity, and dissipation factor. The last three properties were measured with a range of frequencies from 1kHz to 5MHz. DC conductivity increases with increasing of glass powder. It was found that the highest conductivity values are for samples composed of glass powder with a particle size of less than 45 μm for both ratios of glass 20% and 40%. It is also noticed that within most frequencies, the sample with 30% glass has the largest dissipation factor. At 20% filler of glass powder, it is noted that the highest values of the dielectric constant are for samples composed of glass powder with a particle size of less than 45 μm and 125 μm. Below 1 MHz, the effect of glass powder particle size on the AC conductivity is minimal. It is found that the samples containing glass powder (less than 125 μm and 105 μm), have similar and lowest dissipation factor. At 40% filler of glass powder, it is noted that the lowest values of the dielectric constant are for samples composed of glass powder with a particle size little than 105 μm.

Aerosol jet printing of two component thick film resistors on LTCC

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000240-000246 ◽  
Author(s):  
K. Swiecinski ◽  
M. Ihle ◽  
R. Jurk ◽  
E. Dietzen ◽  
U. Partsch ◽  
...  
Keyword(s):  
Particle Size ◽  
Thick Film ◽  
Glass Powder ◽  
New Technology ◽  
Organic Additives ◽  
Powder Mixtures ◽  
Conducting Phase ◽  
Aerodynamic Properties ◽  
Jet Printing ◽  
Aerosol Jet Printing

Aerosol jet printing is a rather new technology for the deposition of thick film structures offering high line and space resolution. This offers a high potential for miniaturization for thick film structures. The advantages of this technology could be shown with inks carrying single solid powder (e.g. silver, platinum, ceramic or glass powder). Challenging is printing of solid powder mixtures due to the differences in the aerodynamic properties of different powders. Those differences result in changes of the mixing ratio within the aerosol jet and therefore poor reproducibility in the final film properties is obtained. In this work, thick film resistors consisting of RuO2 with particle size < 1 μm as the conducting phase and different glass powders with particle size around 1 μm as the isolating phase were investigated. One glass had a density rather close to RuO2, the other glass significantly lower. Inks were made from RuO2/glass powder mixtures, a solvent and organic additives. After manufacturing the inks are printed on LTCC and the microstructures of the dried and the fired films were visualized by FIB preparation and SEM. The resistances as well as the temperature coefficients of the resistors were measured and compared to resistor films with an identical solid composition manufactured by conventional screen printing. The results of the obtained resistors are presented and discussed in terms of powder properties, ink dispersion and printing parameters.

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