TY - JOUR
T1 - An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration
AU - Cai, Yuxin
AU - Liu, Qing feng
AU - Yu, Linwen
AU - Meng, Zhaozheng
AU - Hu, Zhe
AU - Yuan, Qiang
AU - Šavija, Branko
N1 - Accepted Author Manuscript
PY - 2021
Y1 - 2021
N2 - Fresh concrete needs vibration to compact, fill the mould and reach a dense state. During the compaction process, coarse aggregates (CAs) tend to settle, affecting the homogeneity and eventually the long-term durability of hardened concrete. In this study, a 3-D, multi-phase numerical model for fresh concrete is developed for better understanding the CA settlement under vibration. The settlement rate of the CA in vibrated concrete is considered based on the Stokes law, and the calibrated rheological parameter of mixtures is determined by the segmented sieving method. The model prediction shows that the vibration time has the greatest effect on CA settlement, followed by the particle size of CAs, whereas the density of CAs and the plastic viscosity of mixtures contribute a little compared with the aforementioned factors. Through experimental tests, the validity of prediction results is well verified. The proposed model provides a new method to understand and estimate the settlement behaviour of CAs.
AB - Fresh concrete needs vibration to compact, fill the mould and reach a dense state. During the compaction process, coarse aggregates (CAs) tend to settle, affecting the homogeneity and eventually the long-term durability of hardened concrete. In this study, a 3-D, multi-phase numerical model for fresh concrete is developed for better understanding the CA settlement under vibration. The settlement rate of the CA in vibrated concrete is considered based on the Stokes law, and the calibrated rheological parameter of mixtures is determined by the segmented sieving method. The model prediction shows that the vibration time has the greatest effect on CA settlement, followed by the particle size of CAs, whereas the density of CAs and the plastic viscosity of mixtures contribute a little compared with the aforementioned factors. Through experimental tests, the validity of prediction results is well verified. The proposed model provides a new method to understand and estimate the settlement behaviour of CAs.
KW - CA settlement
KW - Fresh concrete
KW - Vibration
KW - Rheology
KW - Numerical model
KW - Grey relational analysis
UR - http://www.scopus.com/inward/record.url?scp=85109112872&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2021.104153
DO - 10.1016/j.cemconcomp.2021.104153
M3 - Article
SN - 0958-9465
VL - 122
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 104153
ER -