Influence on Type of Cement on The SCC Formwork Pressure During and After Casting

3rd World Multidisciplinary Civil Engineering, Architecture, Urban Planning Symposium

土木建筑工程;文学

Cygan, Grzegorz^1 ; Golaszewski, Jacek^1 ; Drewniok, Michal P.^2

Faculty of Civil Engineering, Silesian University of Technology, 5 Akademicka Street, Gliwice

44-100, Poland^1

Department of Engineering, University of Cambridge, Trumpington Street, Cambridge

CB2 1PZ, United Kingdom^2

关键词: Composite cements;    Dispersion ratio;    Formwork pressure;    Fresh concrete;    Hydrostatic level;    Lateral pressures;    Rheological property;    Superplasticizers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/11/112025/pdf
DOI  :  10.1088/1757-899X/471/11/112025

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

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.