Defined-performance design of ecological concrete

Fennis, S.A.A.M.; Walraven, J.C.; Uijl, J.A. den

doi:10.1617/s11527-012-9922-2

Cited by 39 publications

(23 citation statements)

References 6 publications

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“…To achieve this goal several mixtures combining the addition of different pozzolans and filler with the granulometric optimization, and the use of powerful superplasticizers were tested. The granulometric optimization and the use of superplasticizer allow to increase the packing density of the mixture and, consequently, reduce the need for water and binder content since there is less space available between particles (Fennis et al 2013b;De Grazia et al 2019). This contributes to improve the efficiency of the binder paste in strength and the durability performance of the LCC (Björnström and Chandra 2003;Fennis et al 2013aFennis et al , 2013bProske et al 2014).…”

Section: Research Significance and Objectivesmentioning

confidence: 99%

Enhanced Mechanical and Durability Performances of Low Cement Concrete with Natural Pozzolan Addition

Robalo

Costa

Carmo

et al. 2021

ACT

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The decarbonization of concrete structures sector is a priority due to the world climate. Since Portland cement is responsible for approximately 7% of the anthropogenic emissions worldwide, it is decisive to partially replace it by products with lower environmental impact. Fly ash has become highly demanded, due to its proven advantages, however, has announced end by the developed countries. The purpose of this research is to develop and characterize low cement concrete (LCC) with natural and ecological pozzolan additions as an alternative to fly ash. The main objectives are: define several structural concrete mixtures with low cement dosage, ranging from 125 to 175 kg/m 3 ; characterize the workability and the mechanical properties, beyond the durability performance of those concretes; study the influence of pozzolans additions on LCC performance, as an alternative to fly ash; assess the service life of structures produced with the developed LCC. It is possible to produce LCC with natural pozzolan additions, instead of fly ash, with improved mechanical properties and enhanced durability performances. Results also show that the structural LCC produced with pozzolan from Cape Verde provide a great protection against steel corrosion, achieving values 50% higher than concrete with fly ash, and even higher margins when compared with the minimum concrete covers recommended by standards, which highlights the benefits of its use from the sustainability point of view.

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Section: Research Significance and Objectivesmentioning

confidence: 99%

Enhanced Mechanical and Durability Performances of Low Cement Concrete with Natural Pozzolan Addition

Robalo

Costa

Carmo

et al. 2021

ACT

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“…Ein ähnlicher zyklischer Designprozess mit dem Ziel von optimaler Klimaverträglichkeit wird auch von Fennis [49, 50] sowie Haist et al [11, 40] beschrieben, in dem die Packungsdichte der gesamten granularen Mischungszusammensetzung optimiert wird. Allerdings zeigte sich, dass maximal dicht gepackte Kornpackungen eine steife bzw.…”

Section: Betonentwicklungunclassified

Klimaverträglichkeit als Kriterium für Entwurf und Leistungsfähigkeit von Beton am Beispiel eines Kleintierdurchlasses der ÖBB

Juhart

Autischer

Krüger

et al. 2022

Beton und Stahlbetonbau

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Beton ist der weltweit meistverwendete Baustoff und wird u. a. aufgrund seiner hohen Leistungsfähigkeit, Vielseitigkeit und Beständigkeit für Infrastrukturbauten häufig eingesetzt. Seine Produktion und Verwendung verursacht allerdings signifikante Mengen an Treibhausgasemissionen (CO2eq). Jede Reduktion von CO2eq des Baustoffs trägt folglich dazu bei, das gesellschaftliche Ziel der CO2‐Neutralität zu erreichen. Im vorliegenden Beitrag wird an einem Kleintierdurchlass einer Eisenbahnlinie der ÖBB beispielhaft gezeigt, wie Klimaverträglichkeit bzw. CO2‐Äquivalente (kg CO2eq/m3) unmittelbar in den Mischungsentwurf eingehen. Es wird zudem ausgeführt, wie die wesentlichen Leistungsmerkmale klimaschonender Betone – das sind neben CO2‐Äquivalenten insbesondere deren Frühfestigkeit und Dauerhaftigkeit – in ihrer Gesamtheit betrachtet und optimiert werden können. Dafür werden performancebasierte Konzepte zur Bindemitteloptimierung mit kombinierten Zusatzstoffen und zum Nachweis der Dauerhaftigkeit angewandt. Außerdem wird über Erfahrungen bei der Ausführung, Prüfung und Qualitätssicherung von CO2‐reduziertem Beton im Vergleich zu äquivalentem Standardbeton berichtet.

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“…The last two approaches are related to the formulation of concrete. Several scientific works have been developed [11][12][13][14][15][16][17][18][19] with the goal of optimizing the proportion of UHPC constituents, which falls under the second approach. Regarding the third approach, the use of supplementary cementitious materials of micrometric and nanometric size has also been widely studied to partially replace the cement Portland in the production of UHPC, citing as examples the studies carried out by Chan and Chu [20], Droll [21], Tuan et al [22], Ghafari et al [4], Zhao and Sun [23], Yu et al [10], Ferdosian et al [24], etc.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of Eco-Efficient Ultra-High Durability Concrete

et al. 2023

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Ultra-High-Performance Concrete (UHPC) is characterized by having an ultra-compact matrix resulting in ultra-high mechanical properties, low permeability to water and gases, and improved ductility provided by the addition of fibers. The production of structures with this type of concrete is advantageous in some situations, especially in aggressive environments since it significantly increases durability. However, high dosages of Portland cement and silica fume are commonly adopted, increasing not only the cost but also the environmental impact, jeopardizing its use, mainly in the present context where the sustainability of the construction sector is a global priority. In this sense, improving the eco-efficiency of this type of concrete is mandatory. The objective of this work is to develop eco-ultra-high-durability concrete (eco-UHDC). The UHDC matrix was optimized, focusing mainly on durability and looking for the lowest environmental impact, where several parameters were varied: cement replacement ratio, additions in binder matrix and its relative proportions, water/binder ratio, type of fibers, and its proportion. The developed eco-UHDC was characterized both in fresh and hardened states, in terms of mechanical properties, time-dependent properties, and durability. This last topic includes the characterization of durability parameters under laboratory conditions and in a real environment, namely, in the tidal zone of the coast of Cape Verde. The results of resistance to carbonation and chloride penetration were used to predict the service life of structures produced with these eco-UHDC. The optimization of the UHDC matrix allowed the development of mixtures with only 60% of cement in relation to the total amount of powder of the matrix, maintaining good workability and the desired mechanical characteristics (compressive strength higher than 100 MPa and flexural strength higher than 12 MPa). The results also showed that considering only the requirements related to durability, the cover of structures produced with these optimized mixtures can be lower than the values recommended by Eurocode 2, with differences that can reach 55%, mainly when pozzolan of Cape Verde is used as partial replacement of Portland cement.

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Defined-performance design of ecological concrete

Cited by 39 publications

References 6 publications

Enhanced Mechanical and Durability Performances of Low Cement Concrete with Natural Pozzolan Addition

Enhanced Mechanical and Durability Performances of Low Cement Concrete with Natural Pozzolan Addition

Klimaverträglichkeit als Kriterium für Entwurf und Leistungsfähigkeit von Beton am Beispiel eines Kleintierdurchlasses der ÖBB

Development and Characterization of Eco-Efficient Ultra-High Durability Concrete

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