TY - JOUR
T1 - Rheological behavior and formwork pressure of SCC, SFSCC, and NC mixtures
AU - Lomboy, Gilson R.
AU - Wang, Xuhao
AU - Wang, Kejin
N1 - Funding Information:
The authors would like to acknowledge the support of Iowa, Kansas, Nebraska, New York, and Washington State Department of Transportation (DOT), the Federal Highway Administration (FHWA), and the National Center of Concrete Pavement Technology (CP Tech Center) for this research’s sponsorship. The authors would also like to thank Bob Steffes and David Fliehler at Iowa State University for their help with the formwork pressure experiments.
PY - 2014/11
Y1 - 2014/11
N2 - This paper presents the rheological properties of self-consolidating concrete (SCC), semi-flowable self-consolidating concrete (SFSCC), and normal concrete (NC) and their relation to formwork pressure decline. IBB and Brookfield rheometers were used to determined rheological properties of concrete and mortar at 15-90 min after mixing. Formwork pressures were measured using a 200 mm (8 in.) diameter form. Setting time, hydration temperature and compressive strength development of the concretes were also evaluated. SCC displayed shear thickening behavior, and Bingham model became insufficient to describe such rheological behavior of SCC. The initial viscosity and yield stress of SFSCC and NC mortars are similar, but SFSCC mortar has a much higher thixotropy. In concrete mixtures, yield torque increased with time while flow curve slope and thixotropy did not. SCC had the fastest decrease in formwork pressure, followed by SFSCC, then by NC. This correlates with the rate of thixotropy increase of mortar.
AB - This paper presents the rheological properties of self-consolidating concrete (SCC), semi-flowable self-consolidating concrete (SFSCC), and normal concrete (NC) and their relation to formwork pressure decline. IBB and Brookfield rheometers were used to determined rheological properties of concrete and mortar at 15-90 min after mixing. Formwork pressures were measured using a 200 mm (8 in.) diameter form. Setting time, hydration temperature and compressive strength development of the concretes were also evaluated. SCC displayed shear thickening behavior, and Bingham model became insufficient to describe such rheological behavior of SCC. The initial viscosity and yield stress of SFSCC and NC mortars are similar, but SFSCC mortar has a much higher thixotropy. In concrete mixtures, yield torque increased with time while flow curve slope and thixotropy did not. SCC had the fastest decrease in formwork pressure, followed by SFSCC, then by NC. This correlates with the rate of thixotropy increase of mortar.
UR - http://www.scopus.com/inward/record.url?scp=84908449936&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84908449936&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2014.05.001
DO - 10.1016/j.cemconcomp.2014.05.001
M3 - Article
AN - SCOPUS:84908449936
VL - 54
SP - 110
EP - 116
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
ER -