scholarly journals Utilization of glass waste in vehicle restraint systems

2021 ◽  
Author(s):  
László Gáspár ◽  
Zsolt Bencze
Keyword(s):  
Traffic Safety ◽  
Environmental Sustainability ◽  
Treatment Method ◽  
Concrete Surface ◽  
Surface Finishing ◽  
Concrete Technology ◽  
Material Management ◽  
Glass Waste ◽  
Safety Parameter ◽  
Road Materials

The growing demand of society requires that engineers should concentrate more and more on recycling of broken road materials and various by-products in order to ensure environmental sustainability for future generations. Concrete technology has evolved to such an extent that it has become an important role in waste/secondary material management by now. There are several benefits of using glass waste in concrete mixtures. The experi-ments carried out at the Hungarian firm Ferrobeton Ltd. concentrated on exploring the possibility of using glass waste in the cement concrete recipe of vehicle restraint systems in order to release reflection in its material and thereby to increase road safety. In the concrete recipe, the maximization of both usability and reflectivity were aimed to. However, it was also necessary to make sure that the resistance to mechanical and environmental loads could not be worse than in the case of reference (basic) mixture recipe. The quality and type of concrete surface finishing is a financial and also lifetime design issue. The surface treatment method actually applied basically influence the light properties (gleam, reflectivity) of concrete surface as a significant traffic safety parameter.

scholarly journals Innovation potentials for construction materials with specific focus on the challenges in Africa

2020 ◽  
Vol 5 ◽  
pp. 63-74
Author(s):  
Wolfram Schmidt ◽  
Mike Otieno ◽  
Kolawole Olonade ◽  
Nonkululeko Radebe ◽  
Henri Van-Damme ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Construction Materials ◽  
Cementitious Materials ◽  
Sustainable Construction ◽  
African Continent ◽  
Concrete Technology ◽  
Rich Diversity ◽  
The Rich ◽  
Basic Infrastructure ◽  
Industrialised Countries

Africa is urgently in need of adequate basic infrastructure and housing, and it is one of the continents where massive construction activities are on the rise. There is a vast variety of potentially viable resources for sustainable construction on the continents, and consequently, the continent can bring innovative, greener technologies based on local sources effectively into practice. However, unlike established concrete constituents from industrialised countries in the global North, most of the innovation potentials from the African continent have not yet been the focus of intensive fundamental and applied research. This clearly limits the implementation of more sustainable local technologies. This paper presents a case for the need to first appreciate the rich diversity and versatility of the African continent which is often not realistically perceived and appreciated. It discusses specific innovation potentials and challenges for cementitious materials and concrete technology based on local materials derived from sources on the African continent. The unique African materials solutions are presented and discussed, from mineral binders over chemical admixtures and fibres to reinforcement and aggregates. Due to the pressing challenges faced by Africa, with regards to population growth and urbanisation, the focus is not only put on the technological (durability, robustness and safety) and environmental sustainability, but also strongly on socio-economic applicability, adaptability and scalability. This includes a review of alternative, traditional and vernacular construction technologies such as materials-saving structures that help reducing cementitious materials. Eventually, a strategic research roadmap is hypothesised that points out the most relevant potentials and research needs for quick implementation of more localised construction materials.

Nanoadditives - Future of High Performance Concrete

2017 ◽  
Vol 908 ◽  
pp. 83-87
Author(s):  
Martin Labaj ◽  
Jaroslav Válek ◽  
Tomáš Jarolím ◽  
Lucia Osuská
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Concrete Surface ◽  
Cement Stone ◽  
Hardened Cement ◽  
Concrete Technology ◽  
High Quality ◽  
Long Time ◽  
The Impact

These days it is almost impossible to imagine the technology of high performance concrete without the use of any kind of additive. Whether it is a material capable of achieving high strength, excellent mobility of the fresh mix without losing cohesion or producing high quality architectural concrete surface, microadditives have their certain place for a long time now. Although the research in this field still has something to offer, it does not hurt to try to consider the future and imagine the path that will be taken in the production of high performance concrete of next generation. The article deals with the possibility of using nanoparticles in concrete technology. These materials can actively participate in the creation of very high-quality cement stone. In addition, due to the extreme reactivity of nanoparticles, these reactions can take place almost immediately after the onset of hydration and during its first hours. The experimental part of the paper assesses the impact of nanoparticles on selected properties of fresh cement paste and hardened cement mortar. In all cases, there was a positive effect and it has been demonstrated that nanoparticles may eventually create a new category of high performance concrete additives.

Hierarchical porous nitrogen doped reduced graphene oxide prepared by surface decoration–thermal treatment method as high-activity oxygen reduction reaction catalyst and high-performance supercapacitor electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 49497-49504 ◽  
Author(s):  
Zhijun Jia ◽  
Baoguo Wang ◽  
Yi Wang ◽  
Tao Qi ◽  
Yahui Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Thermal Treatment ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Treatment Method ◽  
Surface Finishing ◽  
Step Method ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Hierarchical Porous

Nitrogen doped (N-doped) porous reduced graphene oxide (rGO) is successfully obtained by a two-step method, which includes a surface finishing of graphene oxide (GO) followed by thermal treatment.

scholarly journals Sustainable design of concrete using industrial additives and wastes

2021 ◽  
Author(s):  
Bintul Zehra ◽  
Ali Salem ◽  
Souphavanh Senesavath ◽  
Saied Kashkash ◽  
Zoltan Orban
Keyword(s):  
Portland Cement ◽  
Construction Material ◽  
Steel Slag ◽  
Industrial Processes ◽  
Partial Replacement ◽  
Concrete Technology ◽  
River Sand ◽  
Glass Waste ◽  
Fine Aggregates ◽  
By Products

AbstractConcrete is the most widely used construction material in the world. Over ten billion tons of concrete are being produced each year resulting in exhaustion of natural materials and an enormous carbon footprint. One of the primary goals of concrete technology today is to reduce the use of Portland cement and natural fine aggregates by partially replacing them with various waste materials and by-products of industrial processes. The paper summarizes the results of a study where the partial replacement of river sand and Portland cement was successfully applied using steel slag aggregate, silica fume and glass waste.

scholarly journals Karakteristik Beton Scc (Self Compactibility Concrete) dengan menggunakan Limbah Kaca dan Limbah Bauksit sebagai Bahan Tambah

Jurnal Vokasi ◽  
2021 ◽  
Vol 15 (2) ◽  
pp. 50-56
Author(s):  
Etty Rabihati ◽  
Rasiwan Rasiwan ◽  
Deny Syahrani
Keyword(s):  
Compressive Strength ◽  
Glass Powder ◽  
Economic Value ◽  
Test Results ◽  
Concrete Technology ◽  
Glass Waste ◽  
Alternative Material ◽  
The Impact ◽  
Substitute Materials ◽  
Very High

The use of SCC (Self Compactibility Concrete) concrete in Indonesia is increasing in the field, especially for a variety of buildings that require large compaction speeds or use concrete that can compact itself. SCC Concrete Technology in the construction industry is growing, especially in meeting the needs of the construction world. Added material is an alternative material used to increase the strength characteristics of the concrete. Likewise the addition of glass powder waste, and bauxite waste in making SCC concrete is expected to increase the compressive strength concrete. Fresh concrete, which belongs to the self-compacting concrete (SCC) group, has a very high slump value (more than 20 cm), so measurements with cone abrams are no longer effective. The use of these materials as substitute materials and added based on the thought to utilize glass waste and , bauxite waste in order to reduce the impact of environmental pollution and provide economic value. This study uses glass powder as glass waste and bauxite waste as added material for cement. This study uses four kinds of mixed compositions, namely 0% (ordinary concrete); 2.5% mixture; 5% and 7.5% by weight of cement as added material from glass waste and bouksit waste, where each composition consists of 3 cylindrical specimens with a diameter of 15 cm and a height of 30 cm. Until now there has never been any research from mananpun to test the 2 (two) mixtures, therefore we want to test it so that glass waste and bauxite waste are not wasted and can be reused, especially in making SCC concrete. From the research results it was found that the maximum slum cone test results were in the 2.5% variation that is equal to 44.3 cm, while the minimum at 0% was 29.3 cm. The maximum compressive strength at the age of 3 days is 455,418 kg / cm2 for variations of 7.5% while the minimum is at a variation of 2.5% of 200.469 kg / cm2 at 7 days of concrete.

scholarly journals Production Logistics Visibility – Perspectives, Principles and Prospects

2020 ◽  
Author(s):  
Ravi Kalaiarasan ◽  
Jan Olhager ◽  
Magnus Wiktorsson ◽  
Yongkuk Jeong
Keyword(s):  
Environmental Sustainability ◽  
Business Performance ◽  
Production Systems ◽  
Resource Planning ◽  
Future Research ◽  
Accurate Information ◽  
Material Management ◽  
Production Logistics ◽  
Network Status

Globalisation, competitive markets and increasing sustainability requirements are demanding companies to focus on visibility to improve their supply chains and ultimately their businesses. This paper aims to identify perspectives, principles and prospects of production logistics visibility (PLV). The study is based on a literature review of articles presenting definitions, development trends and the future role of PLV. It is concluded that visibility is generally defined by availability, quality, accessibility and usefulness of information. PLV could refer to the extent to which actors within the production systems have access to timely and accurate information considered useful to their operations. According to the findings, antecedents of PLV include digitalisation, IoT and connectivity. These steps are required to turn data into meaningful information that can be used for decision making in production and logistics setting to improve operational and business performance. Furthermore, to fully benefit from PLV, there has to be an integration of external and internal perspectives. Concluding, the paper defines future research efforts including four lines of exploration and development: (1) Intra-site visibility for material management including dynamic synchronisation, takt and resource planning. (2) Supply-oriented visibility for dynamic status and prediction of supply network status. These two initial lines of enquiry should include the perspectives of stakeholders, parameter, enabling technologies and potential impact. (3) A synthesised framework for Production Logistics Visibility, relying on utilizing antecedents and enabling multi-criteria decision in production logistics based on visibility, where performance in terms of efficiency, sustainability and flexibility is ensured. (4) To specifically detail and exploit the potential in production logistics visibility in the aspect of environmental sustainability and closed material and product loops.

A Brief of Water and Soil Pollution Management (Recent Trend and Economic Perspective)

2021 ◽  
Vol 18 (2) ◽  
pp. 171-180
Author(s):  
Muhammad Safri ◽  
Nurhayani Nurhayani ◽  
Desy Rosarina
Keyword(s):  
Soil Pollution ◽  
Environmental Sustainability ◽  
Recent Trend ◽  
Secondary Data ◽  
Treatment Method ◽  
Information Collection ◽  
Adsorption Method ◽  
The World ◽  
Water And Soil Pollution

Soil and water pollution are the most crucial issues in the world. Various reports have informed that pollution has had long-term adverse effects on environmental sustainability and human health. Several methods have been reported to be effective in reducing pollutant parameters in water and soil. The methods often used in water and soil remediation are bioremediation (land-vetting, bio-cell. Bio cell, Phytoremediation, Land venting, Composite, Bio venting, Bio slurry), Adsorption, Pretreatment (Ultrasonic), Microwave, Electrokinetic disintegration, High-Pressure Homogenization/HPH, Thermal Hydrolysis, Acid hydrolysis (HCl, H2SO4, H3PO4, and HNO3), Ozonation, Fenton Oxidation, Fe (II) -activated persulfate, Protease, amylase, lipase. This paper will explain water and soil pollution and the methods used to overcome them. Information collection is carried out using secondary data; internationally reputable journals and accredited national journals are used to obtain information about the effectiveness and costs incurred. This paper will provide a holistic comparison of prices, effectiveness, and information on various remediating water and soil pollution methods around the world. Based on the NPV and IRR analysis, the water treatment method using the adsorption method is an economically feasible method with an IRR value of 51%.

Compressive Strength Performance of Reactive Powder Concrete Using Different Types of Materials as a Partial Replacement of Fine Aggregate

2020 ◽  
Vol 857 ◽  
pp. 39-47
Author(s):  
Shatha D. Mohammed ◽  
Hadeel K. Awad ◽  
Rawaa K. Aboud
Keyword(s):  
Compressive Strength ◽  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Partial Replacement ◽  
Reactive Powder Concrete ◽  
Fine Aggregate ◽  
Concrete Technology ◽  
Glass Waste ◽  
Strength Performance ◽  
Reactive Powder

Reactive Powder Concrete (RPC) can be incorporate as a one of the most important and progressive concrete technology. It is a special type of ultra-high strength concrete (UHSC) that’s exclude the coarse aggregate from its constitutive materials. In this research an experimental study had been carried out to investigate the effect of using three types of materials (porcelain aggregate) and others sustainable materials (glass waste and granular activated carbon) as a partial replacement of fine aggregate. Four percentages had considered (0, 10, 15 and 20) % to achieve better understanding for the influence of these materials upon the compressive strength of RPC. Four curing ages had included in this study, these are; 7, 28, 60 and 90 days. The outcomes of the experimental works improved that using porcelain aggregate as a partial replacement had an advanced effect on the compressive strength for all the adopted percentages and for all the studied curing ages. The maximum modification that’s obtained in case of porcelain aggregate was (24.14) % at age (90) days for 20% replacement. Using glass waste caused an increase in the overall values of the compressive strength for all the adopted replacements with less efficient than porcelain to reached (20.69) % at age (90) days for 20% replacement. Regarding the granular activated carbon, only (10%) replacement had a positive influence on the compressive strength to reached (13.16) % while the others caused a reduction in the compressive strength reached to (29.13)% for 20% replacement.

scholarly journals Evaluation of Road Safety for Roundabout and Signalized Intersection

2020 ◽  
Vol 9 (4) ◽  
pp. 18-23
Keyword(s):  
Traffic Safety ◽  
Relative Importance ◽  
Expert Opinions ◽  
Traffic Conflict ◽  
The Status ◽  
Safety Parameter ◽  
Travel Delay ◽  
Using Data ◽  
Safety Indices

Traditional intersections have always caused accidents. There are numerous geometric intersection designs that best fit each situation. This study performed an operational and safety comparison with different intersection like signalized, unsignalized and roundabout to decrease the overall travel delay & collision at intersection and increase the safety using case study. This dissertation describes the application of the traffic conflict technique to estimate, traffic safety at intersections. Using data collected from surveys, traffic frequency and severity standards for signalized and roundabout have been established. The methodologies are developed incorporating the relative importance of different severity of different safety indices at intersection. The relative importance (weights) of very low, low, medium and high severity condition is developed using data collection and expert opinions experience people which have knowledge in development/safety development at intersection were obtained by conducting a survey. A questionnaire was prepared to obtain the relative importance of different severity of different parameter performance. The weights are developed in such a way that their values lie between 0 and 1. In proposed work design safety parameter for intersection for enhancement of safety at intersections and all safety design is implemented on MATLAB and analysis of the geometrical design for vehicle system in the intersection by MATLAB, analyses, the status of confliction and desired value obtained by comparison of actual value with available geometric designs and to enhance the safety at intersection and explores methods to solve the problem of collision at intersections. In this paper evaluate safety parameter of roundabout.

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