Functional and environmental performance optimization of Portland cement-based materials by combined mineral fillers

Juhart, Joachim; David, Gheorghe-Alexandru; Saade, Marcella Ruschi Mendes; Baldermann, Claudia; Passer, Alexander; Mittermayr, Florian

doi:10.1016/j.cemconres.2019.05.001

Cited by 26 publications

(27 citation statements)

References 68 publications

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“…The results are presented in Figure 2. Parameters regarding the packing density and water demand as well as the optimum mix-ratio of PC/EF/MF were determined by a new combination of methods termed "Mi-S" described in detail in [9]. "Mi-S" stands for a mixing process (Mi) to measure the wet packing density Φ exp of a waterpowder mix combined with a subsequent spread flow test (S).…”

Section: Materials and MIX Design Materials To Design The Cementitioumentioning

confidence: 99%

“…PC/EF/MF of 50/25/25 V.-%) with higher Φ exp and lower water demand (lower β p and E p ) than the reference paste of pure CEM I, see Table 1 and Figure 3. It should be noted that the MF used possesses the ability to simultaneously increase the packing density of a mix by its physical filling effect and to enhance the flowability despite its high SSA by flow-enhancing effects similar to that of a SP [9]. Additionally, the used EF increases the flowability of the mix with PC due to its relatively low water demand β p and E p .…”

Section: Materials and MIX Design Materials To Design The Cementitioumentioning

confidence: 99%

“…The principles of "green concrete" or "ecological concrete" were pointed out by [1,2,[4][5][6]. The general approach of this study is illustrated in Figure 1 according to [7][8][9]. The methodology is based on the optimization of packing density and the minimization of water demand especially of the powders that represent the paste (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Cement clinker -which represents 95 wt.% of ordinary Portland cement (PC) according to EN 197-1:2018 and is also the main constituent of Portland composite cement -is primarily responsible for GWP and PEt of the paste of normal concrete [1,2]. In an optimized paste PC with its high GWP and PEt is partly substituted by properly selected very fine micro-fillers (MF) and coarser eco-fillers (EF) that have low water demand and lower environmental impact (Table 2), [9]. Previous studies on ecological concrete [6] and ultra-high performance concrete (UHPC) [10] showed that a physical filler effect can be achieved by a size ratio of smaller particles to larger particles (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In our case of eco-concrete, the paste-mix is more eco-efficient when PC or clinker are partly substituted with MF and EF. Such eco-pastes typically have a lower total water content in the mix, but the same or even higher w/c-ratio as pure PC-pastes as well as decreased w/pratio (water/powder-ratio) at equal flowability and at least equal strength [9].…”

Section: Introductionmentioning

confidence: 99%

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Air permeability, water penetration and water absorption to specify durability of eco-efficient concrete

Juhart¹,

Bregar²,

David³

et al. 2019

RILEM Tech Lett

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The durability of eco-efficient, clinker reduced concrete is a key factor of its performance. In the presented study, different durability indicators of a newly developed eco-concrete composition (ECO) are tested versus standard normal concrete as reference (REF). The tested durability indicators are open porosity, water penetration depth, rate of water absorption by capillarity and two different methods of measuring air permeability (PermeaTORR AC device versus Testing bubble counter). The ECO mix and in particular its cementitious matrix is designed by a combined filler concept substituting Portland cement partially by properly selected limestone fillers of different grain sizes. The approach is based on a combination of particle packing optimization techniques and the reduction of water demand for certain flowability of the paste. Cement content is below the limits of traditional standards while w/c-ratio exceed such limits. While the performance of the eco-concrete in terms of workability and strength is at least equivalent to the standard mix, ecological impact indicators as global warming potential and embodied energy are substantially improved. Durability indicators overall show nearly equivalent performance of ECO and REF. In detail, the resulting air permeability coefficient tested with a bubble counter differs significantly from the coefficient tested by PermeaTORR.

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Section: Materials and MIX Design Materials To Design The Cementitioumentioning

confidence: 99%

Section: Materials and MIX Design Materials To Design The Cementitioumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Air permeability, water penetration and water absorption to specify durability of eco-efficient concrete

Juhart¹,

Bregar²,

David³

et al. 2019

RILEM Tech Lett

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Ökologisierung von Normalbeton

Juhart¹,

Krüger²,

Briendl³

et al. 2022

2023 BetonKalender

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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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Functional and environmental performance optimization of Portland cement-based materials by combined mineral fillers

Cited by 26 publications

References 68 publications

Air permeability, water penetration and water absorption to specify durability of eco-efficient concrete

Air permeability, water penetration and water absorption to specify durability of eco-efficient concrete

Ökologisierung von Normalbeton

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

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