Influence on Type of Cement on the SCC Formwork Pressure during and after Casting
IOP Conference Series: Materials Science and Engineering
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Cygan, G., Golaszewski, J., & Drewniok, M. (2019). Influence on Type of Cement on the SCC Formwork Pressure during and after Casting. IOP Conference Series: Materials Science and Engineering, 471 (11)https://doi.org/10.1088/1757-899X/471/11/112025
Formworks for SCC are usually designed under the assumption of full hydrostatic pressure. Nevertheless, current research is attempting to explain the mechanism of this phenomenon as observed pressure usually is at the lower lever than expected. This causes formworks for SCC are usually overdesigned. It was noticed the rheological properties of fresh concrete might be a key to predict the SCC formwork pressure. Therefore, knowing the influence of fresh concrete properties on formwork pressure will enable to design formworks more efficiently. This paper presents the influence of type of cement on formwork pressure caused by SCC. Mixes were design under the assumption of equal dispersion ratio. Three types of cement were investigated: portland, blast furnace and composite cement with a different w/c ratio (0.30, 0.40) and in presence of carboxyl ethers superplasticizer. Formwork pressure was determined on the element imitating a column with dimensions of 0.20x0.20m and a height of 1.20 m with casting speed of 7 m/h. Results show the formwork pressure was registered at the lower than hydrostatic level. Rheological properties had an influence on formwork pressure. It was noticed the different cement types had an influence on rheological properties. Lateral pressure reduction over time was observed with the intensity depending on the cement.
This paper was elaborated with the financial support of the Project No. 842/B/T02/2011/40 "The influence of time and technological factors on rheological properties of self-compacting concrete in terms of the pressure on the formwork" financed by the from the National Science Centre in Cracow, Poland, project “Innovative cementitious materials and concretes made with high – calcium fly ashes” co-financed by the EU from the European Regional Development Fund and the project "DoktoRIS - Scholarship program for innovative Silesia" co-financed by the European Union under the European Social Fund. Research has been done in collaboration with HARSCO Infrastructure Poland HUNNEBECK Poland). This work was developed while Michał Drewniok was at Silesian University of Technology, Faculty of Civil Engineering, Poland.
External DOI: https://doi.org/10.1088/1757-899X/471/11/112025
This record's URL: https://www.repository.cam.ac.uk/handle/1810/290165
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/