Optimization Of Cementitious Material Content For Sustainable Concrete Mixtures Through Value Engineering Approach PDF Download

Author: Adel Baghdady
Publisher:
ISBN:
Category :
Languages : en
Pages : 22

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Book Description
This paper studies the effectiveness of applying value engineering to actual concrete mixtures. The study was conducted in the State of Qatar on a number of strategic construction projects with international engineering specifications for the 2022 World Cup projects. The study examined the concrete mixtures of Doha Metro project and the development of KAHRAMAA's (Qatar Electricity and Water Company) Abu Funtas Strategic Desalination Plant, in order to generally improve the quality and productivity of ready-mixed concrete used in construction and hydraulic projects. The application of value engineering to such concrete mixtures resulted in the following: • Improving the quality of concrete mixtures and increasing the durability of buildings in which they are used; • Reducing the waste of excess materials of concrete mixture, optimizing the use of resources, and enhancing sustainability; • Reducing the use of cement, thus reducing CO2 emissions which ensures the protection of environment and public health; • Reducing actual costs of concrete mixtures and, in turn, reducing the costs of construction projects; and • Increasing the market share and competitiveness of concrete producers. This research shows that applying the methodology of value engineering to ready-mixed concrete is an effective way to save around 5% of the total cost of concrete mixtures supplied to construction and hydraulic projects, improve the quality according to the technical requirements and as per the standards and specifications for ready-mixed concrete, improve the environmental impact, and promote sustainability.

Author: Hosam Saleh
Publisher: BoD – Books on Demand
ISBN: 1839623144
Category : Technology & Engineering
Languages : en
Pages : 238

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Book Description
Cement is the basis of the building and construction industry and of fundamental importance for many civil engineering applications. As such, the cement industry is one of the key industries worldwide necessary for the current and future sustainable development of society. Despite its undisputed importance, the cement industry is one of those industrial branches predominately responsible for high energy consumption and excessive generation of large amounts of carbon dioxide and other contaminants that significantly endanger human health and the environment and contributes to global warming.In this context, nanomaterials, polymeric materials, and natural additives are being used for cement enhancement in various applications. This book examines these novel materials and their optimization, characterization, and sustainable application in the building industry and for stabilizing hazardous waste.

Author: Md Rezaur Rahman
Publisher: Springer Nature
ISBN: 3030988120
Category : Technology & Engineering
Languages : en
Pages : 190

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Book Description
This book presents solutions for optimizing sustainable concrete fabrication techniques. It shows how to reinforce sustainable concrete by various waste materials such as glass waste, uncrushed cockle shell, plastic waste and ceramic tiles. It also reports on properties’ enhancement of high-strength concrete materials. The book presents an analysis of the environmental impact of waste materials’ use.

Author: Avijit Chaubey
Publisher: CRC Press
ISBN: 1000766667
Category : Technology & Engineering
Languages : en
Pages : 185

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Book Description
Practical Concrete Mix Design has been compiled to help readers understand the concrete mix design methodology, including formulas and tables involved in the pertinent steps. This book helps engineers understand the mix design procedure, through illuminating every possible explanation for each step of mix design, limitations given by standards, and practical guides on tailor-making concrete to meet specific requirements. The construction industry needs engineers/experts who can reduce the costs of concrete, and thereby increase their profitability. This book shows effective methods for optimizing concrete and simultaneously achieving the desired properties of concrete. It covers why, how, and when with respect to concrete proportioning and optimization. It further provides the necessary skills for engineers to hone their skills in doing so, understanding the risks involved, and troubleshooting related problems.

Author: Waleed Faleh Almutairi
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 114

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Book Description
Portland cement is an essential ingredient in concrete. The use of cement is to enhance the strength as well as other hardened properties of concrete mixtures. Determining the accurate amount of cement is important because the required strength may not be achieved if not enough cement is used. By contrast, when using too much cement, concrete cracking may occur that leads to reducing durability. Researchers at the University of Arkansas (UA) have shown that many bridge decks achieve their 28 day design strength of 4000 psi by 7 days of age. Bridge decks having high strength may experience cracking, which affects the durability. The Arkansas State Highway and Transportation Department (AHTD) classifies two types of concrete mixtures that can be used in bridges. The first is Class S concrete, and the second is Class S(AE). Class S is used for the structural components and does not contain air entrainment while Class S (AE) is mainly used for bridge decks and contains air entrainment. AHTD requires the same minimum cementitious material content for both classes of concrete. The purpose of this research is to determine if the cementitious material content of Class S mixtures can be reduced while still meeting AHTD specifications. The research program examined cementitious material content, Class C fly ash content, and water to cementitious material ratio (w/cm) . For all mixtures, selected fresh and hardened concrete properties were measured to ensure that they complied with AHTD requirements.

Author: Ezgi Yurdakul
Publisher:
ISBN:
Category :
Languages : en
Pages : 112

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Author: Jorge de Brito
Publisher: Woodhead Publishing
ISBN: 0128208953
Category : Technology & Engineering
Languages : en
Pages : 810

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Book Description
Waste and By-Products in Cement-Based Materials: Innovative Sustainable Materials for a Circular Economy covers various recycled materials, by-products and wastes that are suitable for the manufacture of materials within the spectrum of so-called cement-based materials (CBM). Sections cover wastes for replacement of aggregates in CBM, focus on the application of wastes for the replacement of clinker and mineral additions in the manufacture of binders, discuss the optimization process surrounding the manufacture of recycled concrete and mortars, multi-recycling, advanced radiological studies, optimization of self-compacting concrete, rheology properties, corrosion prevention, and more. Final sections includes a review of real-scale applications that have been made in recent years of cement-based materials in roads, railway superstructures, buildings and civil works, among others, as well as a proposal of new regulations to promote the use of waste in the manufacture of CBM. Favors the institution of the circular economy in the construction industry by eliminating the barriers that currently prevent industrial waste from being valorized by its inclusion in CBM design Features an in-depth exploration of the strengths and weaknesses of new raw materials and their application to CBMs Features real-scale applications that have been made in recent years of cement-based materials in roads, railway superstructures, buildings and civil works, among others Presents current, state-of-the-art, and future-prospects for the use of industrial waste in CBMs

Author: Ankur C. Bhogayata
Publisher: CRC Press
ISBN: 1003809081
Category : Technology & Engineering
Languages : en
Pages : 209

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Book Description
This book focuses on the utilization of wastes produced from plastic usage by industry and consumers, along with the partial to full replacement of conventional cement as a primary binder material in concrete. This book demonstrates how to use post-consumer waste plastics and industry wastes from thermal power stations, agro-industries, and metal industries with a scientific approach to conventional concrete. The primary aim is to demonstrate the methods to prepare a sustainable alternative construction material of concrete using waste materials. Features: Illustrates making eco-friendly procedures of concrete construction popular by way of utilization of plastics and industrial wastes Covers all major aspects of plastic waste-based concrete from conception to execution Promotes alternative materials for sustainable construction Describes economic aspects of using eco-efficient concrete on a mass scale Includes experimental results with graphs This book is aimed at researchers and graduate students in civil engineering, construction materials, and concrete.

Author: Media Kharazi
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages :

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Author: Deepika Sundar
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
The new infrastructure bill promises to invest in repairing and replacing the aging critical infrastructure in the US, particularly roads and bridges. Ultrahigh-performance concrete (UHPC) is a "robust solution for highway infrastructure" since the high compressive strength (>120 MPa), high tensile strength (>5 MPa), homogeneity, and the superior durability of UHPC make it highly reliable wherever it is used (Du et al. 2021). This research aimed to produce and evaluate the performance of low-cost UHPC mixtures using local ingredients. To that end, in the first section of this dissertation, a database consisting of 139 mixture proportions of non-proprietary UHPC formulations, and their workability (flow) and compressive strength data was developed. This database was expanded using prior data of 83 UHPC mixtures developed at Penn State. Random forest-based machine learning (ML) models were developed using this data to first predict the mixtures' flow and compressive strength. Further, physics-based knowledge of the impact of particle size (of aggregates and cementitious materials), particle packing, and chemical composition of the cement was incorporated into the model. This endeavor improved the generalizability of prediction models. In the second part of the dissertation, 130 UHP mortar and concrete mixtures were developed using local ingredients and were evaluated. A plan was devised and executed to determine the impact ingredient properties, mixture proportions, and the temperature of fresh concrete on the properties of UHPC. This experimentation also allowed insight into the robustness of the developed UHPCs to quantify their sensitivity to variability in the mixture constituents and proportions. This research study determined lower-cost alternatives for expensive mixture constituents like quartz filler and quartz sand. At the end of this section, several low-cost UHPC mixtures were developed that met the requirements of FHWA and AASHTO guidelines. Reliably characterizing the mechanical performance, especially the tensile-stress-strain behavior of UHPC mixtures, is critical to determine whether the UHPC exhibited strain-hardening behavior. However, measuring this response by applying uniform loading in tension without pre-maturely cracking the test specimens or inducing large bending strains in the process is challenging. Therefore, in the third section of the dissertation, a UHPC tensile testing setup in compliance with the AASHTO T397-22 test method was built. This set-up involved equipping an 11-kips load cell with custom-made flat grips fabricated following AASHTO recommendations. In addition, an aluminum extensometer was fabricated to measure the average strain in the gauge section, and a data acquisition system was set up to accurately record the load and displacement signals. As a result, the mixtures' extent of strain hardening, and pre-crack localization strain capacity were consistently determined. This setup further allows for the optimization of the fiber reinforcement to reduce the cost of UHPC. Finally, a comprehensive literature review was carried out with the objective of assessing the risk of, and formulating strategies to mitigate, shrinkage cracking in UHPC mixtures. UHPC mixtures tend to be dominated by cementitious materials, composing greater than 60% of the volume of concrete. A high content of cementitious materials and low water-to-cementitious material (w/cm) ratio render UHPC mixtures vulnerable to shrinkage cracking and damage, particularly in connections between prefabricated bridge elements. Thus, the last part of the dissertation reviewed the risk of shrinkage-based cracking in UHPC, the role of fiber reinforcement, and finally assessed the effectiveness of mitigation measures. The outcome of this dissertation is the reduction of the cost of non-proprietary UHPC that were compliant with and exceeded FHWA and AASHTO design guideline performance. It also adds to the know-how in the reliable production of low-cost non-proprietary UHPC mixtures by offering consistently produced and collected data. ML modeling offers efficient and robust tools for future UHPC producers to optimize UHPC mix designs with minimal trial and error.