TY - JOUR
T1 - Evaluation of fracture behavior of high-strength hydraulic concrete damaged by freeze-thaw cycle test
AU - Zhu, Xiangyi
AU - Chen, Xudong
AU - Bai, Yin
AU - Ning, Yingjie
AU - Zhang, Wei
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/2/28
Y1 - 2022/2/28
N2 - Hydraulic concrete structures in cold regions are vulnerable to freeze–thaw (FT) damage, which will affect the fracture performance of concrete structures. Hence, the fracture characteristics of high-strength hydraulic concrete subjected to different FT damage (0, 100, 200, 300, 400 FT cycles) are studied by experimental analysis and discrete element method (DEM) simulation. The results show that the FT damage has a significant weakening effect on the fracture characteristics of concrete beams. The elastic modulus E, critical crack length ac, fracture toughness KIc, fracture energy GF and critical crack tip opening displacement CTODc of concrete beams all show a linearly decreasing trend with the increase of the number of FT cycles. In addition, digital image correlation (DIC) and acoustic emission (AE) techniques are used to reveal the evolution law of internal cracks of FT damaged concrete beams under three-point flexural loads. On the basis of experimental research, the influence indexes of FT damage are introduced into DEM parameters, and a fracture model considering real aggregates is established, which can well predict the fracture behavior of concrete beams subjected to different FT cycles.
AB - Hydraulic concrete structures in cold regions are vulnerable to freeze–thaw (FT) damage, which will affect the fracture performance of concrete structures. Hence, the fracture characteristics of high-strength hydraulic concrete subjected to different FT damage (0, 100, 200, 300, 400 FT cycles) are studied by experimental analysis and discrete element method (DEM) simulation. The results show that the FT damage has a significant weakening effect on the fracture characteristics of concrete beams. The elastic modulus E, critical crack length ac, fracture toughness KIc, fracture energy GF and critical crack tip opening displacement CTODc of concrete beams all show a linearly decreasing trend with the increase of the number of FT cycles. In addition, digital image correlation (DIC) and acoustic emission (AE) techniques are used to reveal the evolution law of internal cracks of FT damaged concrete beams under three-point flexural loads. On the basis of experimental research, the influence indexes of FT damage are introduced into DEM parameters, and a fracture model considering real aggregates is established, which can well predict the fracture behavior of concrete beams subjected to different FT cycles.
KW - DEM prediction model
KW - DIC and AE techniques
KW - FT cycles
KW - Fracture characteristics
KW - Influence indexes of FT damage
UR - http://www.scopus.com/inward/record.url?scp=85122493452&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2022.126346
DO - 10.1016/j.conbuildmat.2022.126346
M3 - Article
AN - SCOPUS:85122493452
SN - 0950-0618
VL - 321
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 126346
ER -