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1

Mechanical and Durability Studies about the use of Municipal Solid Waste Landfill in Concrete

Nair Arya R, Nirmala D. B.

Civil and Environmental Engineering Reports

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2024

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Vol. 34, no. 1

1--19

EN

Landfilling is the most common and cheapest method of waste management practice in India. Municipal Solid Waste Landfills (MSWL) became a nuisance affecting the health, hygiene, sanitation and aesthetics of the surrounding area. Aggregates occupy almost 70% of concrete, so replacing waste materials with them could be a rewarding choice. In the current work, an experimental investigation is being carried out to test the addition of MSWL as a substitution with fine aggregate for concrete production. Out of the different aged samples available at the dumpsite, the most aged sample is chosen for experimental investigations according to the basic physical properties. Concrete mixes, with 0%, 4%, 5%, 7% and 10% partial replacement of fine aggregate with MSWL are tested for mechanical properties such as compressive strength, split tensile strength, flexural strength, and non destructive test and have proved to be a partial substitute for fine aggregate. Durability studies such as water absorption, acid attack and sulphate attack also gave better experimental proof for the sustainable reuse of this waste material. The research reveals 5% replacement is the optimum considering all the test result values. The paper leads to advanced research for the suitability of the material in the construction industry.

2

Enhanced Concrete Performance and Sustainability with Fly Ash and Ground Granulated Blast Furnace Slag – A Comprehensive Experimental Study

Cheruvu Rajasekhar, Rao Burugupalli Kameswara

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 3

161--174

EN

This research paper explains in detail how well regular concrete works and how well concrete with fly ash and ground granulated blast furnace slag (GGBS) as a substitute for cement. Through a series of experiments, the objective of the study is to perform an experimental approach that promote the usage of partial replacement-based concrete that can replace the conventional concrete and to promote the sustainable development. a dedicated methodology is developed for the study, focussing on the mechanical and durability properties of the materials with inducing sustainable materials. The methodology study examines at the mechanical properties, durability, and microstructural attributes of the concrete blends. Cement concrete specimens with binder ratios (%) of 0.3, 0.4, and 0.5 were tested for compressive strength, rapid chloride permeability, SEM, and XRD at 28, 56, and 90 days. Fly ash and GGBS were used to partially replace cement at 0% to 70% for all binder ratios by weight of cement. There were optimal replacement percentages for each binder ratio and fly ash and GGBS partially substituted concrete had similar or enhanced mechanical properties to conventional concrete. The novelty of the study is to incorporate microstructure analysis for the same samples that shall enable to analyse the behaviour of the partial replaced materials with conventional concrete. In connection with the results, the study had found lower RCPT values in partial replacement concrete specimens, fly ash and GGBS increased chloride ion resistance. SEM and XRD analyses revealed the concrete mixtures' microstructural properties and phase composition, showing how supplementary cementitious materials refine pore structure and provide durable hydration products. This study shows that fly ash and GGBS can improve concrete performance and reduce impact on environment and applications in construction.

3

Beton niskoemisyjny - perspektywy rozwoju

Gruszczyński Maciej

Materiały Budowlane

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2023

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nr 11

55

4

Reducing the Reactive Powder Concrete Weight by Using Building Waste as Replacement of Cement

Abbas Zena K., Al-Baghdadi Hayder A., Mahmood Raghad Sameer, Abd Estabraq Shawqi

Journal of Ecological Engineering

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2023

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Vol. 24, nr 8

25--32

EN

The ability of reducing the high weight of reactive powder concrete (RPC) by decreasing the cement content using waste demolished building material to produce the eco-friendly sustainable RPC was the main goal of the experimental lab investigation. The collecting, crushing and grinding to high fineness powder waste of clay brick, window glass and terrazzo tile constituted the best way to dispose without the need for a waste sanitary landfill. Nine RPC mixtures with 5, 10 and 15% partial replacement of cement weight in addition to control mix were prepared to investigate the strength. The slight enhancement strength of the RPC containing 5% of very fine powder clay brick or window glass or terrazzo tile as cement weight replacement cement up to (4.9, 4.2, 4.5)% – brick, (2, 1.8, 1.6)% – glass and (1.5, 0.5, 0.8)% – tile for (compressive – flexural – tensile), respectively, at 28 days compared to the control mix. The percentage of 10% still yielded acceptable strength results, while 15% presented the starting of reduction of (compressive – flexural – tensile) strength.

5

Mikrobiologiczne wytrącanie kalcytu jako alternatywna metoda uszczelniania powierzchniowego kompozytu cementowego

Zygmunt Marcin, Bednarska Dalia, Wieczorek Alicja, Drzewiecka Dominika, Koniorczyk Marcin, Batog Maciej, Bakalarz Jakub

Materiały Budowlane

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2022

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nr 7

38--42

PL

W artykule przedstawiono zastosowanie mikrobiologicznego wytrącania kalcytu jako alternatywnej metody wzmacniania powierzchniowego kompozytów cementowych. Opisano procedury wytrącania kalcytu (ang. microbiologically induced calcium carbonate precipitation, MICP) oraz przedstawiono wyniki pilotażowych badań laboratoryjnych zastosowania tej metody. Wykazano duży potencjał zastosowania mikrobiologicznego wytrącania kalcytu w budownictwie, co w porównaniu z metodami tradycyjnymi jest procesem ekologicznie przyjaznym oraz energooszczędnym. Uzyskane wyniki wskazują, że zastosowanie wytrącania kalcytu prowadzi do wyraźnej poprawy właściwości badanych próbek i ich uszczelnienia. Planowane jest kontynuowanie i rozszerzenie badań, sprawdzające inne procedury zastosowania MICP.

EN

In this article, an application of MICP is examined, as an alternative method of surface strengthening in cement composites. Several MICP procedures and results out of some reference lab testing are shown in this paper. The high potential of MICP building application is shown based on the obtained results - the surface strengthening and sealing are improved. Additionally, the examined method is more ecologically friendly and energy-efficient compared with the standard procedures of surface strengthening. It is planned to continue research on MICP application in concrete elements.

6

The effect of recycled aggregates on the accuracy of the maturity method on vibrated and self-compacting concretes

Velay-Lizancos M., Martinez-Lage I., Vazquez-Burgo P.

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 2

311--321

EN

Fine and coarse recycled aggregate used jointly as partial replacement of natural aggregate is not allowed for structural concrete in many international standards. More studies about it are needed toward more ecofriendly standards. This research studies one important aspect for structural concrete: the influence of recycled aggregate on the accuracy of the maturity method. A total of 7 mixes were studied with two types of reference concretes: vibrated (VC) and self-compacting concrete (SSC). For vibrated concrete, we studied 4 mixes with different partial replacements of recycled aggregates: 0%, 8%, 20% and 31%. For self-compacting concrete, the partial replacements were 0%, 20% and 50% of the total amount of aggregates. We found that, for percentages equal or higher than 20%, the higher is the percentage of recycled aggregate, the higher the activation energy. It was observed that a unique curve “Maturity–Relative strength (S/S∞)” can be used for each type of concrete (SSC or VC) independent of the percentage of recycled aggregate. In addition, we found higher accuracy of the estimations using the hyperbolic equation for the curve “Maturity–S/S∞” than using the exponential equation; applying the hyperbolic approach, less than 3% of the estimations had an error higher than 10%.

7

Możliwość redukcji CO2 przez zastosowanie betonu zrównoważonego i kruszywa recyklingowego

Zając B., Gołębiowska I.

Inżynieria i Aparatura Chemiczna

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2012

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Nr 5

262-264

PL

W pracy analizowano poszczególne fazy cyklu życia obiektu betonowego związane z emisją i absorpcją CO2 oraz przedstawiono wybrane sposoby redukcji dwutlenku węgla poprzez obniżenie zużycia cementu w betonie i poprzez karbonatyzację. Obniżenie zużycia cementu w betonie można uzyskać przez stosowanie zastępczych, odpadowych materiałów przemysłowych. Absorpcja CO2 zachodzi głównie podczas procesu karbonatyzacji: w czasie użytkowania budowli, w trakcie rozbiórki i stosowania recyklingowych kruszyw betonowych.

EN

Particular phases of concrete construction life cycle related to COsub>2 emission and absorption are analyzed. Also selected reduction methods of carbon dioxide by decreasing cement consumption in concrete and by carbonation are described in the paper. Reduction of cement consumption in concrete is possible by application of supplementary industrial byproducts. Absorption of CO2 occurs mostly during carbonation process: in construction exploitation time, its demolition and usage of recycling aggregate concrete.