Eco-Efficient Concrete Using Industrial Wastes: A Review

Pacheco-Torgal, F.; Shasavandi, Arman; Jalali, Saíd

doi:10.4028/www.scientific.net/msf.730-732.581

Cited by 14 publications

(6 citation statements)

References 46 publications

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“…All these negative impacts have twisted the arms of researchers, concrete technologists and scientists to search for alternate materials for construction, which must certainly be user and eco-benign, durable, sustainable, affordable, essentially cost-effective, and can lend a helping hand in the saving of limited natural resources [11][12][13][14]. These are the root causes of the attraction by many researchers towards innovative geopolymer technology and geopolymer composites such as GP-cements, GP-pastes, GP-mortars, GP-concrete, etc.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Fly Ash-Based Geopolymer

Luhar

2022

J. Compos. Sci.

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The discovery of an innovative category of inorganic geopolymer composites has generated extensive scientific attention and the kaleidoscopic development of their applications. The escalating concerns over global warming owing to emissions of carbon dioxide (CO2), a primary greenhouse gas, from the ordinary Portland cement industry, may hopefully be mitigated by the development of geopolymer construction composites with a lower carbon footprint. The current manuscript comprehensively reviews the rheological, strength and durability properties of geopolymer composites, along with shedding light on their recent key advancements viz., micro-structures, state-of-the-art applications such as the immobilization of toxic or radioactive wastes, digital geopolymer concrete, 3D-printed fly ash-based geopolymers, hot-pressed and foam geopolymers, etc. They have a crystal-clear role to play in offering a sustainable prospect to the construction industry, as part of the accessible toolkit of building materials—binders, cements, mortars, concretes, etc. Consequently, the present scientometric review manuscript is grist for the mill and aims to contribute as a single key note document assessing exhaustive research findings for establishing the viability of fly ash-based geopolymer composites as the most promising, durable, sustainable, affordable, user and eco-benevolent building materials for the future.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Fly Ash-Based Geopolymer

Luhar

2022

J. Compos. Sci.

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“…This is because the FAMC are easily soluble and reactive with aggregates that have high silica content. PACHECO et al [9] describe that cementitious matrices with fly ash provide slower hydration chemical reactions, but, this addition is indicated to reduce clinker consumption, with the replacements in the cement between 40% and 50%. The use of fly ash combined with new production technologies can contributes to reducing CO 2 emissions, the main environmental liability of the cement industry.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of coal fly ash in cementitious matrices

Altheman

Ferreira

Montini

et al. 2017

Rev. IBRACON Estrut. Mater.

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ResumoThe addition of ash, initially classified as waste in cement matrices, is essential to achieve the requirements of National Policy of Solid Waste. However, technologies that enable such applications should be sought, especially when the material has adequate pozzolanic activity. The aim of this study was to verify the pozzolanic activity of fly ash from coal burning, from the aluminum manufacturing process, such as mineral admixture in mortars and conventional concrete. For that, physicochemical characterization of the ash sample and the mechanical behavior of mix dosage of mortar and commercially used concrete tests were carried out. Results showed the ash in evaluation has pozzolanicity as relevant standards employed and when inserted in the studied cementitious matrices, showed the expected performance for this type of addition (higher mechanical strength at older ages).Keywords: fly ash, concrete, mortar, waste, aluminum.A adição de cinzas em matrizes cimentícias é essencial para se alcançar os requisitos da Política Nacional dos Resíduos Sólidos. Entretanto, deve-se buscar tecnologias que viabilizem tais aplicações, principalmente quando o material apresenta adequada atividade pozolânica. O objetivo deste trabalho foi verificar a atividade pozolânica da cinza volante proveniente da queima de carvão mineral, proveniente do processo de fabricação de alumínio, como adição mineral em argamassas e concretos convencionais. Para isso foram realizados ensaios de caracterização físico-química da amostra de cinza e do comportamento mecânico de traços de argamassas e concretos comercialmente empregados. Os resultados demonstraram que a cinza em questão possui atividade pozolânica conforme normas ABNT empregadas e quando inserida nas matrizes cimentícias estudadas, apresentaram o desempenho esperado para este tipo de adição (maior resistência mecânica em idades mais avançadas).Palavras-chave: cinza volante, concreto, argamassa, resíduo, alumínio.

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“…There are several SCMs that each have specific properties and therefore play a different role in enhancing the mechanical properties of concrete, for example, Silica fume shows a significant pozzolanic reaction rate which results in an increase in the compressive strength at early ages [ 4 ], and Fly ash has very slow hydration characteristics, thus providing very little contribution to early-age strength [ 5 ] but instead providing suitable workability [ 6 ]. On the other hand, the ability of SCMs to react with calcium hydroxide is under the influence of the chemical and physical properties of that specific SCM [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Compressive Strength of Concrete Containing Binary Supplementary Cementitious Material Using Machine Learning Approach

et al. 2022

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Several advantages of supplementary cementitious materials (SCMs) have led to widespread use in the concrete industry. Many various SCMs with different characteristics are used to produce sustainable concrete. Each of these materials has its specific properties and therefore plays a different role in enhancing the mechanical properties of concrete. Multiple and often conflicting demands of concrete properties can be addressed by using combinations of two or more SCMs. Thus, understanding the effect of each SCM, as well as their combination in concrete, may pave the way for further utilization. This study aims to develop a robust and time-saving method based on Machine Learning (ML) to predict the compressive strength of concrete containing binary SCMs at various ages. To do so, a database containing a mixture of design, physical, and chemical properties of pozzolan and age of specimens have been collected from literature. A total of 21 mix design containing binary mixes of fly ash, metakaolin, and zeolite were prepared and experimentally tests to fill the possible gap in the literature and to increase the efficiency and accuracy of the ML-based model. The accuracy of the proposed model was shown to be accurate and ML-based model is able to predict the compressive strength of concrete containing any arbitrary SCMs at ay ages precisely. By using the model, the optimum replacement level of any combination of SCMs, as well as the behavior of binary cementitious systems containing two different SCMs, can be determined.

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Eco-Efficient Concrete Using Industrial Wastes: A Review

Cited by 14 publications

References 46 publications

A Comprehensive Review on Fly Ash-Based Geopolymer

A Comprehensive Review on Fly Ash-Based Geopolymer

Evaluation of coal fly ash in cementitious matrices

Predicting the Compressive Strength of Concrete Containing Binary Supplementary Cementitious Material Using Machine Learning Approach

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