scholarly journals RECYCLING OF MODIFIED ASPHALT SHEETS FOR AUTOMOTIVE USE

10.6036/10097 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 351-354
Author(s):  
MIGUEL FERNANDO ALDAS CARRASCO ◽  
CRISTINA PAOLA PAVON VARGAS ◽  
ANDRES FABRICIO ACEVEDO DAVILA ◽  
HARRISON DE LA ROSA RAMIREZ ◽  
VLADIMIR VALLE ALVAREZ ◽  
...  
Keyword(s):  
Manufacturing Process ◽  
Industrial Scale ◽  
Recycling Process ◽  
Modified Bitumen ◽  
Modified Asphalt ◽  
Asphalt Mastic ◽  
Minimum Requirements ◽  
Rotational Viscosity ◽  
Parameters Of Interest ◽  
Selection Of

In the present study, the recycling of modified bitumen soundproofing membranes, known as automotive-grade asphalt (ART) membranes, was carried out. The ART sheets were incorporated in the mixing stage of the asphalt mastic, which is part of the manufacturing process of new sheets. The selection of the best asphalt mastic formulation was performed at laboratory scale, where the ATR sheet cutting waste was added to the original asphalt mastic at 2.5, 5.0, 7.5, 10.0 and 15.0 % w/w percentages. The formulations were evaluated for six parameters of interest associated with softening point, rotational viscosity, density, weight per area, thickness and creep. It was determined that the properties of all the formulations studied met the minimum requirements stipulated for the commercialization of the product. The recycling process was carried out on an industrial scale using the formulation with 5% w/w of ATR residues, which presented a viscosity close to that of the original mastic. The results at industrial scale were favorable, since the six parameters of interest were within the ranges established in the regulations.

scholarly journals INFLUENCE OF RECYCLED AGGREGATE QUALITY FROM PRECAST REJECTION ON MECHANICAL PROPERTIES OF SELF-COMPACTING CONCRETE

10.6036/10079 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 407-414
Author(s):  
JOSE ANGEL PEREZ BENEDICTO ◽  
MERCEDES DEL RIO MERINO ◽  
PEDRO LUIS LOPEZ JULIAN ◽  
ANGEL SALESA BORDANABA ◽  
ALEJANDRO ACERO OLIETE
Keyword(s):  
Recycled Aggregate ◽  
Industrial Scale ◽  
Recycling Process ◽  
Self Compacting Concrete ◽  
Modified Bitumen ◽  
Asphalt Mastic ◽  
Minimum Requirements ◽  
Rotational Viscosity ◽  
Parameters Of Interest ◽  
Selection Of

In the present study, the recycling of modified bitumen soundproofing membranes, known as automotive type membranes (ATR), was carried out. The ATR sheet waste was incorporated in the mixing stage of the asphalt mastic, which is part of the manufacturing process of new sheets. The selection of the best asphalt mastic formulation was carried out at laboratory scale, where the ATR sheet cutting waste was added to the original asphalt mastic in percentages of 2.5, 5.0, 5.0, 7.5, 10.0 and 15.0 % w/w. The formulations were evaluated for six parameters of interest associated with softening point, rotational viscosity, density, weight per area, thickness and creep. It was determined that the properties of all the formulations studied met the minimum requirements stipulated for the commercialization of the product. The recycling process was carried out on an industrial scale using the formulation with 5% w/w of ATR residues, which presented a viscosity close to that of the original mastic. The results at industrial scale were favorable, since the six parameters of interest were within the ranges established in the regulations. Translated with www.DeepL.com/Translator (free version)

scholarly journals Multi-Criteria Selection of Additives in Porous Asphalt Mixtures Using Mechanical, Hydraulic, Economic, and Environmental Indicators

2021 ◽  
Vol 13 (4) ◽  
pp. 2146
Author(s):  
Anik Gupta ◽  
Carlos J. Slebi-Acevedo ◽  
Esther Lizasoain-Arteaga ◽  
Jorge Rodriguez-Hernandez ◽  
Daniel Castro-Fresno
Keyword(s):  
Cellulose Fiber ◽  
Environmental Indicators ◽  
Asphalt Mixtures ◽  
Environmental Benefits ◽  
Modified Bitumen ◽  
Porous Asphalt ◽  
Different Types ◽  
Product Assessment ◽  
Polymer Modified Bitumen ◽  
Selection Of

Porous asphalt (PA) mixtures are more environmentally friendly but have lower durability than dense-graded mixtures. Additives can be incorporated into PA mixtures to enhance their mechanical strength; however, they may compromise the hydraulic characteristics, increase the total cost of pavement, and negatively affect the environment. In this paper, PA mixtures were produced with 5 different types of additives including 4 fibers and 1 filler. Their performances were compared with the reference mixtures containing virgin bitumen and polymer-modified bitumen. The performance of all mixes was assessed using: mechanical, hydraulic, economic, and environmental indicators. Then, the Delphi method was applied to compute the relative weights for the parameters in multi-criteria decision-making methods. Evaluation based on distance from average solution (EDAS), technique for order of the preference by similarity to ideal solution (TOPSIS), and weighted aggregated sum product assessment (WASPAS) were employed to rank the additives. According to the results obtained, aramid pulp displayed comparable and, for some parameters such as abrasion resistance, even better performance than polymer-modified bitumen, whereas cellulose fiber demonstrated the best performance regarding sustainability, due to economic and environmental benefits.

Cybersecurity Standards in the Context of Operating System

2021 ◽  
Vol 54 (3) ◽  
pp. 1-36
Author(s):  
Syed Wasif Abbas Hamdani ◽  
Haider Abbas ◽  
Abdul Rehman Janjua ◽  
Waleed Bin Shahid ◽  
Muhammad Faisal Amjad ◽  
...  
Keyword(s):  
Organizational Context ◽  
Cyber Attacks ◽  
Fine Tuning ◽  
Security Vulnerabilities ◽  
Compliance Testing ◽  
Depth Analysis ◽  
Minimum Requirements ◽  
Security Standards ◽  
High Degree ◽  
Selection Of

Cyber threats have been growing tremendously in recent years. There are significant advancements in the threat space that have led towards an essential need for the strengthening of digital infrastructure security. Better security can be achieved by fine-tuning system parameters to the best and optimized security levels. For the protection of infrastructure and information systems, several guidelines have been provided by well-known organizations in the form of cybersecurity standards. Since security vulnerabilities incur a very high degree of financial, reputational, informational, and organizational security compromise, it is imperative that a baseline for standard compliance be established. The selection of security standards and extracting requirements from those standards in an organizational context is a tedious task. This article presents a detailed literature review, a comprehensive analysis of various cybersecurity standards, and statistics of cyber-attacks related to operating systems (OS). In addition to that, an explicit comparison between the frameworks, tools, and software available for OS compliance testing is provided. An in-depth analysis of the most common software solutions ensuring compliance with certain cybersecurity standards is also presented. Finally, based on the cybersecurity standards under consideration, a comprehensive set of minimum requirements is proposed for OS hardening and a few open research challenges are discussed.

scholarly journals KOMPETENSI PETERNAK SAPI POTONG PERANAKAN ONGOLE DALAM PEMBUATAN KOMPOS (STUDI KASUS PADA KELOMPOK TERNAK MEKAR KECAMATAN DAGANGAN KABUPATEN MADIUN)

2018 ◽  
Vol 10 (3) ◽  
pp. 1
Author(s):  
Deha Purwoko ◽  
Bekti Nur Utami
Keyword(s):  
Manufacturing Process ◽  
Research Method ◽  
Organic Content ◽  
Compost Quality ◽  
Preparation Stage ◽  
Before And After ◽  
Descriptive Approach ◽  
Quantitative Descriptive ◽  
Selection Of

This research aims to describe the level of competence of farmers in composting, and to draft extension and try out the implementation of counseling about composting in group of livestock of Mekar. The research was conducted in sub-district Dagangan of Madiun Regency. Selection of livestock group is done by purposive that is the only group of livestock that have made compost that is group of livestock of Mekar which is located in Kepet village. The research method used is case study with quantitative descriptive approach with scoring. The population is 44 people, the sample is based on the census. The results showed that: 1) the level of competence of farmers in composting is classified with the details of the competence of the preparation stage is low, the competence of the manufacturing process is low, and the competence of the storage stage is classified; and 2) drafting the extension plan based on the target and the purpose of extension so that the breeder know, understand and able to increase the C-Organic content and C / N Ratio on the compost according to the standard. Success shows the improvement of compost quality before and after counseling in accordance with the purpose of counseling.   Keywords: competence of breeder, livestock group of Mekar, draft extension, composting, extension

scholarly journals The Contribution of Geological Maps and Mapping to Industrial Scale Design

2021 ◽  
Vol 5 (1) ◽  
pp. 35
Author(s):  
Emmanouil Manoutsoglou ◽  
Nikolaos Papageorgiou ◽  
Emilios Georgiou
Keyword(s):  
Site Selection ◽  
Economic Viability ◽  
Industrial Scale ◽  
Research Project ◽  
Geological Maps ◽  
Acceptable Quality ◽  
Scale Design ◽  
Selection Of

The aim of this work is to highlight the contribution of geological maps and mapping to industrial scale design. To achieve this goal, the site selection of a new quarry area is used as an example. For the development of a new quarry, the materials to be mined must meet specific requirements, mainly acceptable quality, adequate reserves, environmental restrictions, and economic viability. Geological maps of various scales were used in all stages of this research project. Initially, geological surveillance maps (1:50,000), which formed the basis for the sampling, were used. Finally, this research project was completed with the detailed mapping of two candidate areas for the development of the new quarry.

Continuous Recycling of Vulcanisates

2001 ◽  
Vol 28 (6) ◽  
pp. 5-11 ◽  
Author(s):  
K. Fukumori ◽  
M. Mouri ◽  
N. Sato ◽  
H. Okamoto ◽  
M. Matsushita
Keyword(s):  
Shear Stress ◽  
Internal Stress ◽  
Automobile Industry ◽  
Manufacturing Process ◽  
Recycling Process ◽  
Epdm Rubber ◽  
Rubber Waste ◽  
Controlled Conditions ◽  
New Process

Vulcanised EPDM rubber waste produced during the manufacturing process is devulcanised using a screw granulator under controlled conditions of shear stress, temperature and internal stress. During this recycling process, carbon-sulphur bonds are broken selectively so that a devulcanised rubber consisting of a sol component and a gel component is obtained which can be processed like new rubber and re-vulcanised with an accelerated sulphur curing system. The revulcanisates exhibit nearly the same properties as cured new rubber. EPDM rubber which has been devulcanised using the new process is used for the production of rubber products for the automobile industry.

scholarly journals Assessment and Comparison of Various MCDM Approaches in the Selection of Manufacturing Process

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Atef M. Ghaleb ◽  
Husam Kaid ◽  
Ali Alsamhan ◽  
Syed Hammad Mian ◽  
Lotfi Hidri
Keyword(s):  
Decision Making ◽  
Computational Complexity ◽  
Manufacturing Process ◽  
Group Decision ◽  
Die Casting ◽  
Multicriteria Decision Making ◽  
Sand Casting ◽  
Manufacturing Processes ◽  
Alternative Processes ◽  
Selection Of

The selection of manufacturing processes for a given application is a complex problem of multicriteria decision-making although there have been several different approaches that can be utilized to select a suitable alternative. However, identifying appropriate multicriteria decision-making approach from the list of available methods for a given application is a difficult task. This work suggests a methodology to assess different selection approaches, which are the technique for order of preference by similarity to ideal solution (TOPSIS), analytic hierarchy process (AHP), and VIKOR: stepwise procedure. This valuation was done depending on the following factors: number of alternative processes and criteria, agility through the process of decision-making, computational complexity, adequacy in supporting a group decision, and addition or removal of a criterion. A case study in this study was presented to analyse the evaluation methodology. The criteria used to evaluate and identify the best manufacturing process were categorized into productivity, accuracy, complexity, flexibility, material utilization, quality, and operation cost. Five manufacturing processes were considered, including gravity die casting, investment casting, pressure die casting, sand casting, and additive manufacturing. The results showed that each approach was suitable for the problems of manufacturing process selection, in particular toward the support of group decision-making and uncertainty modelling. Manufacturing processes were ranked based on their respective weights for AHP, TOPSIS, and VIKOR, and sand casting is the best. In terms of computational complexity, the VIKOR method performed better than TOPSIS and AHP. Moreover, the VIKOR and TOPSIS methods were better convenient to the selection of manufacturing processes for agility during the process of decision-making, the number of alternative processes and criteria, adequacy in supporting a group decision, and addition or removal of a criterion.

scholarly journals Evaluation of bitumen physical properties modified with waste plastic pipes

2018 ◽  
Vol 45 (6) ◽  
pp. 469-477 ◽  
Author(s):  
Sevil Köfteci ◽  
Perviz Ahmedzade ◽  
Taylan Günay
Keyword(s):  
Low Temperature ◽  
Physical Properties ◽  
Test Results ◽  
Dynamic Shear ◽  
Modified Bitumen ◽  
Bending Beam Rheometer ◽  
Waste Plastic ◽  
Plastic Pipes ◽  
Low Temperature Cracking ◽  
Rotational Viscosity

The aim of this paper is to examine the effects of ground plastic pipe wastes on bitumen. For this purpose, three modified bitumen samples with modifier contents of 2%, 4%, and 6% along with pure bitumen were prepared and tested. To understand the effect of modifier on bitumen, conventional bitumen tests, rotational viscosity tests at 135 °C and 165 °C, dynamic shear rheometer tests at three different frequencies that represent three different traffic speeds, and bending beam rheometer (BBR) test were performed. The BBR test results showed that resistance of pure bitumen to low-temperature cracking increased by using additives up to 4%. Based on the results of this study, it can be said that waste plastic pipes can be used as modifier for the bitumen binder. The 4% additive showed the best performance.

scholarly journals Experimental Study to Determine the Most Preferred Additive for Improving Asphalt Performance Using Polypropylene, Crumb Rubber, and Tafpack Super in Medium and High-Temperature Range

2019 ◽  
Vol 9 (8) ◽  
pp. 1567 ◽  
Author(s):  
Huang Xiaoming ◽  
Ismail Bakheit Eldouma
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Mechanical Performance ◽  
Asphalt Binder ◽  
Crumb Rubber ◽  
Asphalt Binders ◽  
Modified Bitumen ◽  
Asphalt Modification ◽  
Rotational Viscosity ◽  
Asphalt Performance

The overall objectives of this study were to determine the most appropriate additive for improving the physical properties and the medium- and high-temperature performances (mechanical performance) of asphalt binders. Three different types of modified binders were prepared: crumb rubber modifier (CRM), polypropylene (PP), and tafpack super (TPS), which had concentrations of 2%, 3%, 3.5%, and 4% by weight of asphalt binder, for each modifier. Their physical and rheological properties were evaluated by applying various tests such as ductility, rotational viscosity, toughness, and tenacity, as well as the dynamic shear rheometer (DSR) test. As a result, the physical properties of the modified bitumen binders were compared, as were the medium- and high-temperature performances (mechanical performance), which had temperatures of 58, 64, 70, 76, 82, and 88 °C, respectively. This was how the most appropriate modifier was determined. The results demonstrated that the asphalt binder properties significantly improved by utilizing CRM followed by PP and TPS modifiers. The increase in the rutting parameter (G*/sin(δ)) after asphalt modification indicated its excellent performance at both medium- and high-temperatures. Lastly, the CRM was determined as the most preferred additive because of its positive effect on the physical properties and enhancement of the medium- and high-temperature performance (mechanical performance).

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