scholarly journals The effect of modification of binders on technological and operational properties of composite construction materials

2018 ◽  
Vol 245 ◽  
pp. 03017 ◽  
Author(s):  
Lyubov Zakrevskaya ◽  
Igor Handelsman ◽  
Galina Provatorova
Keyword(s):  
Positive Impact ◽  
Construction Materials ◽  
New Materials ◽  
Composite Construction ◽  
Recycled Pet ◽  
Main Method ◽  
Basic Properties ◽  
Laboratory Technology ◽  
Properties Of Composites

The object of the study includes modified road bitumen and geotextile materials, for the synthesis of which recycled PET and CNT were used. The production of new materials is caused by the need to improve their technical characteristics, which, in the end, should have a positive impact on the properties of composites based on them. The main method of research is an experiment. During the experiment, a grid of compositions of new materials and laboratory technology for their production were developed, their basic properties were studied. According to the results of the study of the basic properties of new materials there is an improvement of their basic properties up to 10% compared to the original ones.

scholarly journals Mechanical and structural properties of composites made from recycled and virgin polyethylene terephthalate (PET) and metal chip or mesh wire

2019 ◽  
Vol 299 ◽  
pp. 06007
Author(s):  
Mircea Aurelian Antoniu Rusu ◽  
Sever-Adrian Radu ◽  
Catalin Moldovan ◽  
Codruta Sarosi ◽  
Ionela Amalia Mazilu (Moldovan) ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Terephthalate ◽  
Processing Parameters ◽  
Sem Images ◽  
Major Drawback ◽  
Recycled Pet ◽  
Plastic Processing ◽  
Metal Chip ◽  
Intense Research ◽  
Properties Of Composites

Although polyethylene terephthalate (PET) is a champion of recycling, intense research is being done to find new solutions for using recycled plastic. This study aims to characterize the mechanical andstructural properties (SEM- scanning electron microscopy) of products made from recycled metal swarf or mesh wire with recycled plastic (PET) in comparison with virgin plastic. Samples manufactured from virgin and recycled PET are made by pressing and high temperature. The loss of mechanical properties ofproducts made from recycled plastic is a major drawback that influences their use. SEM images confirm that the dispersion and distribution of the PET phase is not very uniform. By addition of virgin plastic in various compositions with recycled plastic, processing parameters and mechanical properties can be optimized.

scholarly journals Entrepreneurship Education in Nigeria Tertiary Institutions and its Impact on Students’ Entrepreneurial Career Intentions. A Study of Students at Federal Polytechnic Ekowe

2020 ◽  
Vol 5 (4) ◽  
Author(s):  
Kurotimi Maurice Fems
Keyword(s):  
Phenomenological Study ◽  
Positive Impact ◽  
Entrepreneurship Education ◽  
Entrepreneurial Intention ◽  
Positive Influence ◽  
Policy Makers ◽  
Tertiary Institutions ◽  
Career Intention ◽  
Laboratory Technology ◽  
The Impact

 Purpose: Entrepreneurship education as an influencer of graduate entrepreneurial intention is gaining massive attention amongst practitioners, policy makers and academics across the globe. The proliferation of entrepreneurship courses in universities around the world is evident of this wide acceptance of entrepreneurship education as a strategy for graduate entrepreneurship. The purpose of this research paper is to ascertain the impact entrepreneurship education has on students’ entrepreneurial career intentions.Methodology: The article includes a review of literature in entrepreneurship education and entrepreneurial intention to gain background knowledge. This research is a qualitative, interpretive phenomenological study and relies on narrative as a means of knowing, and as a form of communication. The scope of the study is year one students at the Federal Polytechnic of Oil & Gas Ekowe in the departments of Computer Science, Science Laboratory Technology and Statistics. The questionnaire was designed in a semi-structured way and distributed to students to return after 7 days to allow for proper articulation of narratives.Findings: A total of 42 students participated in the interview and 42 returned. 28.57% representing 12 students showed intention to start a business, 40.48% (17 students) desire to get a job after graduation while 13 students (30.95%) are unsure what they want to do after graduation. The results indicate that entrepreneurship education has a positive impact on students’ entrepreneurial career intention but other than EE, it was also revealed from participants’ narratives that age, prior experience and parents’ status have positive influence on graduate entrepreneurial decisions.Implication of Findings: Findings will aid curriculum designers and educational policy makers to scrutinize and re-examine EE programmes and how they are taught to enhance practice.Originality: Narratives and storytelling methods are not the common methods adopted in entrepreneurship education and entrepreneurial intention research. More research should be carried out using this method to validate results from this approach.

Waste-Based Construction Materials

2019 ◽  
Vol 41 ◽  
pp. 88-102 ◽  
Author(s):  
Elena Zelinskaya ◽  
N.A. Tolmacheva ◽  
V.V. Barakhtenko ◽  
A.E. Burdonov ◽  
N.E. Garashchenko ◽  
...  
Keyword(s):  
Coal Combustion ◽  
Baikal Region ◽  
Construction Materials ◽  
Industrial Wastes ◽  
Raw Material ◽  
Composite Construction ◽  
Construction Companies ◽  
Thermoplastic Matrix ◽  
Local Construction ◽  
And Storage

The article is devoted to the research into the utilization of large volume industrial wastes to produce mineral-polymer composite construction materials. To produce the composites, polyvinyl chloride wastes have been suggested as binding thermoplastic matrix and ash-and-slag wastes, which are the by-product of coal combustion at TPP of Irkutsk Oblast, as mineral filler. Since the problem of accumulation and storage, such as large volumes of power generation industry wastes is becoming more and more serious, the recycling of these wastes with the production of useful products is the vital task. Plants that manufacture products from PVC also produce plastic wastes in the form of rejected and substandard raw material, which can be recycled. At the same time, the problem of production available construction materials for the Baikal region from the local cheap raw material is solved. The team of Irkutsk National Research Technical University has conducted a number of the industrial trials on the production of mineral-polymer composites by the method of extrusion. As a result, the principal opportunity of co-utilization of PVC wastes and ash-and-slag materials during the production of composite construction materials has been testified. Local construction companies can use the produced materials.

Stochastic Multi-Objective Optimization-Based Life Cycle Cost Analysis for New Construction Materials and Technologies

2019 ◽  
Vol 2673 (11) ◽  
pp. 466-479
Author(s):  
Jingqin Gao ◽  
Kaan Ozbay ◽  
Hani Nassif ◽  
Onur Kalan
Keyword(s):  
Life Cycle ◽  
Cost Analysis ◽  
Life Cycle Cost ◽  
Construction Materials ◽  
Optimal Investment ◽  
Management Decision ◽  
Life Cycle Cost Analysis ◽  
Investment Strategies ◽  
New Materials ◽  
New Construction

The sustainability of transportation infrastructure depends on the adoption of new construction materials and technologies that can potentially improve performance and productivity. However, most agencies would like to evaluate these new materials and technologies at both the project and network levels before replacing the traditional ones. It also remains a challenge to reliably estimate the costs and lifetime performance of new construction materials and technologies because of limited implementation data. To address these issues, this paper presents a comprehensive bottom-up methodology based on Life Cycle Cost Analysis (LCCA) to integrate project- and network-level analysis that can fast-track the acceptance of new materials or technologies. Hypothesized improvement rates are applied to the deterioration functions of existing materials to represent the expected improved performance of a new material compared with a conventional material with relatively similar characteristics. This new approach with stochastic treatment allows us to probabilistically evaluate new materials with limited data for their future performance. Feasible maintenance and rehabilitation schedules are found for each facility at the project level and near-optimal investment strategies are identified at the network level by using a metaheuristic evolutionary algorithm while satisfying network-wide constraints. This provides an effective solution to many issues that have not been fully addressed in the past, including the trade-off between multiple objectives, effects of time, uncertainty, and outcome interpretation. A hypothetical bridge deck system from New Jersey’s bridge inventory database is used to demonstrate the applicability of the proposed methodology in constructing a planning and management decision-support procedure.

scholarly journals Physical and mechanical properties of composites based on hemp shives and lime

2018 ◽  
Vol 49 ◽  
pp. 00010 ◽  
Author(s):  
Przemysław Brzyski ◽  
Grzegorz Łagód
Keyword(s):  
Mechanical Properties ◽  
Thermal Insulation ◽  
Thermal Conductivity Coefficient ◽  
Positive Impact ◽  
Physical And Mechanical Properties ◽  
Wall Material ◽  
High Porosity ◽  
Plant Origin ◽  
Timber Frame ◽  
Properties Of Composites

One of the objectives of sustainable development in construction is the use of low-processed materials. They have a positive impact on the ecological balance of the building throughout the entire life cycle. Examples of such materials are materials of plant origin - straw, shives, cellulose fibers. They are used as thermal insulation or wall material. In recent years, hemp shives are increasingly used as a component of a lime-based composite, which performs the function of wall filling in timber frame constructions. The shives, due to the high porosity, determine the high thermal insulation properties of the composite. The physico-mechanical properties of the composite can be modified depending on various factors, including the ratio of hemp shives to the binder. The lime binder, in turn, can be modified by hydraulic and pozzolan additives. The paper presents mechanical properties (compressive and flexural strength) as well as physical properties (density, porosity, thermal conductivity coefficient, absorbability) of composites with various proportions of hemp shives of the Bialobrzeskie variety to the lime binder modified with Portland cement and metakaolinite.

scholarly journals Utilization of Pet Wastes Aggregate in Building Construction - A Review

2020 ◽  
Vol 9 (3) ◽  
pp. 656-663
Keyword(s):  
Building Materials ◽  
Construction Materials ◽  
Chemical Properties ◽  
Waste Recycling ◽  
Building Construction ◽  
Recycled Pet ◽  
Pet Waste ◽  
Physical And Chemical ◽  
Plastic Containers ◽  
And Chemical Properties

The rapid increase of plastics waste produced worldwide today poses a danger to human health because of the pollution caused by the unsafe disposal and non-biodegradability of this waste combined with toxic gas emissions during incineration. Globally, PET (polyethylene terephalate) is commonly used for bottling water and other plastic containers. Recycling the waste would be an additional benefit. This study focuses some researchers on the forms, methods of recycling and various literature applications of PET wastes. Recycled PET can of course be used when combined with the sand aggregate to manufacture of various construction materials, such as tiles, bricks, paving stones etc. This research focuses on its application as it attracts substantial building materials such as the manufacture of various PET waste tiles and their unique mechanical , physical and chemical properties; There are some important studies discussed in relation to PET waste, recycling methods , and results from the study. Even various applications are described here. Its usefulness is further defined as roofing Composite concrete, floor tiling and other applications

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