scholarly journals Experimental Study on Ready-Mix Concrete: Case Study

2018 ◽  
Vol 149 ◽  
pp. 01071
Author(s):  
Dorra Ellouze ◽  
Aida Ghammouri ◽  
Rahma Ben Amar
Keyword(s):  
Building Materials ◽  
Mechanical Tests ◽  
Professional Life ◽  
Price Ratio ◽  
Minimal Cost ◽  
Concrete Case ◽  
Fresh State ◽  
Hardened State ◽  
Ready Mix Concrete

Ready-mix concrete (RMC) in Tunisia is becoming more and more in demand in the civil engineering sector thanks to its qualities of handling in the fresh state and resistance in the hardened state, this composite material must respect the quality-price ratio. A RMC with a minimal cost is the object of our work. This research is part of the opening of higher education on professional life, where we optimized the formulation of a RMC. This work has 3 axes. In the first place the resources in building materials were characterized, namely various samples of sand, gravel, cement and water. Subsequently, the adjuvant-cement ratio (A/C) was optimized. Finally, the workability of the concrete as well as its mechanical aptitude at various ages 7, 14 and 28 days were characterized. These examinations have resulted in an appropriate formulation for any type of resource that varies according to the provenance of the quarries (gravel and sand), the effect of the plasticizer-water reducer is found for a very interesting A/C ratio, the mechanical tests for different ages are also conclusive.

Analysing the Suitability of C16/20-X0v(H)-24-F3 Concrete for Pumping

2015 ◽  
Vol 812 ◽  
pp. 213-218
Author(s):  
Alexandra Kitti Németh ◽  
M.B. Maros
Keyword(s):  
Practical Problem ◽  
Mechanical Tests ◽  
The Novel ◽  
Additive Structure ◽  
Concrete Material ◽  
Technological Performance ◽  
The Given ◽  
Industrial Problem ◽  
Ready Mix Concrete

The current paper introduces a case study dealing with the problem of pumpability of the ready-mix concrete of grade of C16/20-X0v (H)-24-F3 []. During solving a practical industrial problem we have worked out a modified composition of the related concrete material in order to improve the pumpability. After describing some possible theoretical and practical methods the authors give suggestion for a practical solution. The characteristic feature of the method consists in modifying the recipe of the given grade of concrete without altering the additive structure, and to assure the pulp saturation. The paper reports the results of standardised physical and mechanical tests, executed on the novel concrete material. Based on these results it has been proved, that besides solving the original practical problem of pumpability, the new concrete material possesses better application and technological performance, and is more economical to produce.

scholarly journals Experimental Study on Ready-Mix Concrete: Case Study

2018 ◽  
Vol 149 ◽  
pp. 01071
Author(s):  
Dorra Ellouze ◽  
Aida Ghammouri ◽  
Rahma Ben Amar
Keyword(s):  
Experimental Study ◽  
Concrete Case ◽  
Ready Mix Concrete

Experimental and Numerical Characterization of Self-Compacting Concrete «Using Construction Waste»

2015 ◽  
Vol 749 ◽  
pp. 353-357 ◽  
Author(s):  
Hassiba Hermime ◽  
Youcef Bouafia ◽  
Sarah Benakli
Keyword(s):  
Shear Force ◽  
Mechanical Tests ◽  
Test Results ◽  
Numerical Characterization ◽  
Fresh State ◽  
Hardened State ◽  
Mechanical Performances ◽  
Direct Tensile ◽  
Direct Tensile Test

This work carries an experimental study on the composition and the characterization of the self-compacting concretes made starting from waste of construction with comparisons which were made by contribution with the vibrated concrete. Studies on the workability and the compactness of material were made and this in a fresh state and a hardened state. Five different mechanical tests were performed: compression, direct tensile, splitting tensile, 3 points binding and failure to the shear force. Confrontations of the test results compared to formulas for calculating the shear force were realized. All the test results showed an increase in terms of resistance for SCC contribution to the VC, except the direct tensile test which gave values slightly lower. The SCC improves the failure load notably and gives better mechanical performances.

Evaluating The Effectiveness Of Problem-Based Learning (Pbl) Implemented In The Textile Engineering Course - A Case Study On Ahsanullah University Of Science And Technology, Bangladesh

2014 ◽  
Vol 1 (1) ◽  
pp. 111-114
Author(s):  
Lal Mohan Baral ◽  
Ramzan Muhammad ◽  
Claudiu Vasile Kifor ◽  
Ioan Bondrea
Keyword(s):  
Engineering Students ◽  
Science And Technology ◽  
Problem Based Learning ◽  
Professional Life ◽  
System Level ◽  
Teaching Tool ◽  
Technical Problems ◽  
Empirical Survey ◽  
Undergraduate Programs

AbstractProblem-based learning as a teaching tool is now used globally in many areas of higher education. It provides an opportunity for students to explore technical problems from a system-level perspective and to be self-directed life-long learner which is mandatory for equipping engineering students with the skill and knowledge. This paper presents a case study illustrating the effectiveness of implemented Problem-based learning (PBL) during five semesters in the undergraduate programs of Textile Engineering in Ahsanullah University of Science and Technology (AUST). An assessment has been done on the basis of feedback from the students as well as their employers by conducting an empirical survey for the evaluation of PBL impact to enhance the student's competencies. The Evaluations indicate that students have achieved remarkable competencies through PBL practices which helped them to be competent in their professional life.

scholarly journals Integration of Emergy Analysis with Building Information Modeling

2021 ◽  
Vol 13 (14) ◽  
pp. 7990
Author(s):  
Suman Paneru ◽  
Forough Foroutan Jahromi ◽  
Mohsen Hatami ◽  
Wilfred Roudebush ◽  
Idris Jeelani
Keyword(s):  
Life Cycle ◽  
Building Materials ◽  
Building Information Modeling ◽  
Energy Analysis ◽  
Information Modeling ◽  
Environmental Cost ◽  
Emergy Analysis ◽  
Modeling Tools ◽  
Building Information

Traditional energy analysis in Building Information Modeling (BIM) only accounts for the energy requirements of building operations during a portion of the occupancy phase of the building’s life cycle and as such is unable to quantify the true impact of buildings on the environment. Specifically, the typical energy analysis in BIM does not account for the energy associated with resource formation, recycling, and demolition. Therefore, a comprehensive method is required to analyze the true environmental impact of buildings. Emergy analysis can offer a holistic approach to account for the environmental cost of activities involved in building construction and operation in all its life cycle phases from resource formation to demolition. As such, the integration of emergy analysis with BIM can result in the development of a holistic sustainability performance tool. Therefore, this study aimed at developing a comprehensive framework for the integration of emergy analysis with existing Building Information Modeling tools. The proposed framework was validated using a case study involving a test building element of 8’ × 8’ composite wall. The case study demonstrated the successful integration of emergy analysis with Revit®2021 using the inbuilt features of Revit and external tools such as MS Excel. The framework developed in this study will help in accurately determining the environmental cost of the buildings, which will help in selecting environment-friendly building materials and systems. In addition, the integration of emergy into BIM will allow a comparison of various built environment alternatives enabling designers to make sustainable decisions during the design phase.

scholarly journals Life Cycle Environmental Assessment of Light Steel Framed Buildings with Cement-Based Walls and Floors

2020 ◽  
Vol 12 (24) ◽  
pp. 10686
Author(s):  
Mona Abouhamad ◽  
Metwally Abu-Hamd
Keyword(s):  
Life Cycle ◽  
Building Materials ◽  
Simulation Software ◽  
Life Cycle Assessment Methodology ◽  
Building Information Model ◽  
Building Information ◽  
Cold Formed Steel ◽  
Environmental Measures ◽  
Materials Used

The objective of this paper is to apply the life cycle assessment methodology to assess the environmental impacts of light steel framed buildings fabricated from cold formed steel (CFS) sections. The assessment covers all phases over the life span of the building from material production, construction, use, and the end of building life, in addition to loads and benefits from reuse/recycling after building disposal. The life cycle inventory and environmental impact indicators are estimated using the Athena Impact Estimator for Buildings. The input data related to the building materials used are extracted from a building information model of the building while the operating energy in the use phase is calculated using an energy simulation software. The Athena Impact Estimator calculates the following mid-point environmental measures: global warming potential (GWP), acidification potential, human health potential, ozone depletion potential, smog potential, eutrophication potential, primary and non-renewable energy (PE) consumption, and fossil fuel consumption. The LCA assessment was applied to a case study of a university building. Results of the case study related to GWP and PE were as follows. The building foundations were responsible for 29% of the embodied GWP and 20% of the embodied PE, while the CFS skeleton was responsible for 30% of the embodied GWP and 49% of the embodied PE. The production stage was responsible for 90% of the embodied GWP and embodied PE. When benefits associated with recycling/reuse were included in the analysis according to Module D of EN 15978, the embodied GWP was reduced by 15.4% while the embodied PE was reduced by 6.22%. Compared with conventional construction systems, the CFS framing systems had much lower embodied GWP and PE.

scholarly journals Effect of Polypropylene Fibre Addition on Properties of Geopolymers Made by 3D Printing for Digital Construction

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2352 ◽  
Author(s):  
Behzad Nematollahi ◽  
Praful Vijay ◽  
Jay Sanjayan ◽  
Ali Nazari ◽  
Ming Xia ◽  
...  
Keyword(s):  
3D Printing ◽  
Bond Strength ◽  
Fibre Volume ◽  
Interface Plane ◽  
Flexural Performance ◽  
Fresh State ◽  
Hardened State ◽  
3D Printed ◽  
Shape Retention ◽  
Interlayer Bond

This paper investigates the effect of polypropylene (PP) fibres on the fresh and hardened properties of 3D-printed fibre-reinforced geopolymer mortars. Different percentages of PP fibres ranging between 0.25% and 1.00% by volume were added to an optimised geopolymer mixture. All samples showed reasonable workability and extrudability. In addition, shape-retention ability in the fresh state was investigated as a major requirement for 3D-printing. The compressive strength of the printed specimens was tested in the hardened state in three loading directions, viz. longitudinal, perpendicular, and lateral. The flexural strength of samples was also tested in the longitudinal and lateral directions. In addition, the interlayer bond strength was investigated. Fibre addition seems to influence compressive strengths positively only when the loading is perpendicular to the interface plane. This is due to the preferential fibre alignment parallel to the direction of extrusion. The addition of fibre significantly enhanced the flexural performance of the printed samples. The use of fibre dosages of 0.75 and 1.00 vol % caused deflection-hardening behaviour of the 3D-printed geopolymers and, hence, a significantly higher fracture energy in comparison to specimens without fibre or with lower fibre content. However, an increase in the fibre volume caused some minor reduction in interlayer bond strength. With respect to properties in the fresh state, higher fibre volumes caused better shape-retention ability in the printed samples. The results indicate the possibility of printing fibre-reinforced geopolymers which meet all the necessary properties in both the fresh and hardened states.

scholarly journals El archivo de la “Fundación Rodríguez”. Análisis, potencia y gestión del legado

2020 ◽  
Vol 23 ◽  
pp. 36-57
Author(s):  
Iker Fidalgo Alday
Keyword(s):  
Research Process ◽  
Digital Content ◽  
Concrete Case ◽  
Artistic Production ◽  
Collective Work ◽  
Artistic Work ◽  
Do So

El presente artículo parte de un caso de estudio concreto que es la investigación en torno al archivo del colectivo artístico “Fundación Rodríguez” (Vitoria-Gasteiz, 1994-2012). El proceso de investigación estará marcado por todo lo que conlleva enfrentarse a un archivo compuesto por contenido digital y con formatos a punto de la obsolescencia, así como las dificultades para su conservación y mantenimiento. Partiendo de esto, se contextualizará la práctica de “Fundación Rodríguez” y el papel que juega el concepto de archivo en varias de las fases de su producción artística. Para ello analizaremos su posición desde el trabajo colectivo, la disolución del rol del artista y la desmaterialización de la obra artística como los tres frentes principales desde los que se erige su producción. Con todo, podremos valorar desde la actualidad la vigencia y relevancia de su legado, así como la potencia del mismo en el contexto artístico al que pertenece. This article starts from a concrete case study that is the research around the archive of the artistic collective “Fundación Rodríguez” (Vitoria-Gasteiz, 1994-2012). The research process will be marked by all that is involved in dealing with an archive composed of digital content and formats on the verge of obsolescence, as well as the difficulties of preserving and maintaining them. Starting from this, the practice of “Fundación Rodríguez” and the role played by the concept of archive in several of the phases of its artistic production will be contextualized. To do so, we will analyze its position from the perspective of collective work, the dissolution of the role of the artist and the dematerialization of the artistic work as the three main fronts from which its production is built.With all this, we will be able to evaluate from the present time the validity and relevance of his legacy as well as its power in the artistic context to which it belongs.

scholarly journals Radon monitoring in a historical building in Košice city, Slovakia – a case study

2021 ◽  
Vol 900 (1) ◽  
pp. 012040
Author(s):  
E Singovszká ◽  
A Eštoková ◽  
M Vertaľ
Keyword(s):  
Human Exposure ◽  
Continuous Monitoring ◽  
Building Materials ◽  
Indoor Radon ◽  
Research Topic ◽  
Relevant Research ◽  
Historical Building ◽  
Limit Value ◽  
Radon Monitoring

Abstract It is known that the highest contribution to the yearly radiation dose for the population derives from natural radioactivity. About 50% of that is estimated to be caused by exposure to radon (Rn) and its products. Human exposure to indoor Rn is currently considered a relevant research topic, because of the associated epidemiological aspects. This paper aimed at Rn concentration measurement in a selected building in Košice city, Slovakia. The continuous monitoring of indoor radon levels was performed over a period of 40 days. The measured concentrations ranged in a wide interval up to 92 Bq/m3. The WHO limit value of 100 Bq/m3 wasn´t exceeded. Analysing the possible sources, both contributions of radon from the building materials and radon from the soil was observed.

scholarly journals Playing Global Monopoly in Cement: The Globalization of CEMEX

2021 ◽  
Vol 8 (1) ◽  
pp. 10
Author(s):  
Mark William Cawman ◽  
Patricia Fine-Skalnik
Keyword(s):  
International Business ◽  
Environmental Sustainability ◽  
Multinational Corporation ◽  
Building Materials ◽  
Significant Risk ◽  
Cultural Dimensions ◽  
Business Growth ◽  
Research Article ◽  
Political Implications

This research article is intended for use as a classroom case study with questions for discussion in International Business. This research analyzes CEMEX and their strategy for globalization. CEMEX is a Mexico founded building materials company that operates in more than fifty countries and maintains trade relationships in over one-hundred nations. In addition to CEMEX creating an international business, CEMEX embraces core values including ethics, integrity, and environmental sustainability. The literature review in this study, documents how CEMEX overcame cultural and political implications, and significant risk to become a significant multinational corporation. The topical focus and purpose of this research is to explore CEMEX critically as a specimen company representing cross-cultural and international business growth. The analysis includes the utilization of the Hofstede Cultural Dimensions framework and the PESTLEEG analysis.

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