TY - JOUR
T1 - Investigations of mixing technique on the rheological properties of self-compacting concrete
AU - Li, Huajian
AU - Huang, Fali
AU - Yi, Zhonglai
AU - Wang, Zhen
AU - Zhang, Yong
AU - Yang, Zhengxian
PY - 2020
Y1 - 2020
N2 - Rheological properties are of significant importance in successful placement and performance of self-compacting concrete (SCC). In this work, the rheological properties of SCC, combined with a powder-viscosity modifying admixture, were investigated based on a series of experimental studies. The modified Bingham model was applied to determine the rheological parameters and shear thickening behavior of SCC. The effects of mixing procedures, including charging sequence, mixing time and mixing speed, were analyzed. The results show that the shear thickening of SCC is reduced by first mixing the aggregate and water and then adding other raw materials. The direct contact between aggregate and water leads to a large amount of free water to be adsorbed by the aggregate system, resulting in an increase of the yield stress. In order to ensure an excellent fluidity and a low shear thickening behavior of SCC, the mixing time should be controlled at 4-5 min and the mixing speed at 30-45 r/min.
AB - Rheological properties are of significant importance in successful placement and performance of self-compacting concrete (SCC). In this work, the rheological properties of SCC, combined with a powder-viscosity modifying admixture, were investigated based on a series of experimental studies. The modified Bingham model was applied to determine the rheological parameters and shear thickening behavior of SCC. The effects of mixing procedures, including charging sequence, mixing time and mixing speed, were analyzed. The results show that the shear thickening of SCC is reduced by first mixing the aggregate and water and then adding other raw materials. The direct contact between aggregate and water leads to a large amount of free water to be adsorbed by the aggregate system, resulting in an increase of the yield stress. In order to ensure an excellent fluidity and a low shear thickening behavior of SCC, the mixing time should be controlled at 4-5 min and the mixing speed at 30-45 r/min.
KW - Charging sequence
KW - Mixing speed
KW - Mixing time
KW - Rheological properties
KW - Self-compacting concrete
UR - http://www.scopus.com/inward/record.url?scp=85088787688&partnerID=8YFLogxK
U2 - 10.3390/app10155189
DO - 10.3390/app10155189
M3 - Article
AN - SCOPUS:85088787688
SN - 2076-3417
VL - 10
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
IS - 15
M1 - 5189
ER -