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The Impact of Different Parameters on the Formwork Pressure Exerted by Self-Compacting Concrete
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-0036-8417
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-1398-6118
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-3997-3083
2023 (English)In: Materials, E-ISSN 1996-1944, Vol. 16, no 2, article id 759Article in journal (Refereed) Published
Abstract [en]

Despite the advantageous benefits offered by self-compacting concrete, its uses are still limited due to the high pressure exerted on the formwork. Different parameters, such as those related to concrete mix design, the properties of newly poured concrete, and placement method, have an impact on form pressure. The question remains unanswered on the degree of the impact for each parameter. Therefore, this study aims to study the level of impact of these parameters, including slump flow, T500 time, fresh concrete density, air content, static yield stress, concrete setting time, and concrete temperature. To mimic the casting scenario, 2 m columns were cast at various casting rates and a laboratory setup was developed. A pressure system that can wirelessly and continuously record pressure was used to monitor the pressure. Each parameter’s impact on the level of pressure was examined separately. Casting rate and slump flow were shown to have a greater influence on pressure. The results also demonstrated that, while higher thixotropy causes form pressure to rapidly decrease, a high casting rate and high slump flow lead to high pressure. This study suggests that more thorough analysis should be conducted of additional factors that may have an impact, such as the placement method, which was not included in this publication.

Place, publisher, year, edition, pages
MDPI , 2023. Vol. 16, no 2, article id 759
Keywords [en]
formwork, parameters, pressure, self-compacting concrete
National Category
Other Materials Engineering
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-95541DOI: 10.3390/ma16020759ISI: 000927643400001PubMedID: 36676495Scopus ID: 2-s2.0-85146533983OAI: oai:DiVA.org:ltu-95541DiVA, id: diva2:1735258
Funder
Svenska Byggbranschens Utvecklingsfond (SBUF)
Note

Validerad;2023;Nivå 2;2023-02-08 (joosat);

Licens fulltext: CC BY License

Available from: 2023-02-08 Created: 2023-02-08 Last updated: 2024-11-20Bibliographically approved
In thesis
1. Formwork Pressure of Self-Compacting Concrete
Open this publication in new window or tab >>Formwork Pressure of Self-Compacting Concrete
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Self-compacting concrete (SCC) is commonly known for its high flowability and resistance to segregation. Using SCC in constructing large structural members where reinforcements are congested offers several benefits, including reduced project time and a better work environment due to the lack of vibration. However, the concern is the presumably higher pressure exerted on the formwork during casting.

This thesis presents the results of a study on the form pressure exerted by SCC, which included the literature review to evaluate existing theoretical design models, laboratory testing, and modelling. A laboratory setup was developed, including a 2-meter circular column instrumented with a wireless pressure system. Two types of SCC were tested: with and without ground granulated blast furnace slag (GGBFS). The pressure was recorded by novel pressure sensors attached to transmitters to send real-time data to the cloud. The system was equipped with a pressure membrane that was in direct contact with the concrete. Several material and environmental parameters were recorded before and during casting.

The collected data were used to assess the accuracy of the following models, including DIN1821 (2010), Khayat et al. (2009), Gardner et al. (2012), Teixeira et al. (2017), Beitzel (2010), Ovarlez and Roussel (2006), and Proske (2010).  Most models were conservative, calculating higher pressures than recorded. In the next step, machine learning methods were developed to monitor and predict the pressure during casting continuously. These models showed significantly higher accuracy and flexibility than the existing prediction models. 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
self-compacting concrete, form pressure, material parameters, mathematical modelling, maximum pressure, pressure reduction
National Category
Other Materials Engineering
Research subject
Building Materials
Identifiers
urn:nbn:se:ltu:diva-109666 (URN)978-91-8048-626-2 (ISBN)978-91-8048-627-9 (ISBN)
Public defence
2025-02-28, A109, Luleå University of Technology, Luleå, 08:00 (English)
Opponent
Supervisors
Available from: 2024-09-05 Created: 2024-09-05 Last updated: 2025-01-28Bibliographically approved

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Gamil, YaserCwirzen, AndrzejNilimaa, JonnyEmborg, Mats

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