TY - JOUR
T1 - Research on local deformation property of asphalt mixture using digital image correlation
AU - Xing, Chao
AU - Tan, Yiqiu
AU - Liu, Xueyan
AU - Anupam, Kumar
AU - Scarpas, Tom
PY - 2017/6/1
Y1 - 2017/6/1
N2 - Failure behavior of asphalt mixture is the process of local deformation accumulation, therefore, local deformation investigation is the base work of failure behavior. Digital image correlation (DIC) method is an optical method which can calculate the local deformation in the failure process. This paper aims to evaluate the precision, select the optimal test parameters for DIC deformation measurement based on natural speckle image, and investigate the local deformation characteristic in the failure process for different mixtures. The results show the image quality of AC with smaller normal maximum aggregate size (NMAS) is better for DIC deformation calculation, the relative deviation of virtual translation and shear test can satisfy the precision requirement, the optimal subset size is 31. Based on the strain distribution, the optimal local deformation measure length for indirect tensile test is set as 50 mm, the critical steady strain is proposed based on R2 obtained by the least squares fitting method, according to local deformation characteristic, the results show SMA can bear more deformation before unstable deformation stage and failure.
AB - Failure behavior of asphalt mixture is the process of local deformation accumulation, therefore, local deformation investigation is the base work of failure behavior. Digital image correlation (DIC) method is an optical method which can calculate the local deformation in the failure process. This paper aims to evaluate the precision, select the optimal test parameters for DIC deformation measurement based on natural speckle image, and investigate the local deformation characteristic in the failure process for different mixtures. The results show the image quality of AC with smaller normal maximum aggregate size (NMAS) is better for DIC deformation calculation, the relative deviation of virtual translation and shear test can satisfy the precision requirement, the optimal subset size is 31. Based on the strain distribution, the optimal local deformation measure length for indirect tensile test is set as 50 mm, the critical steady strain is proposed based on R2 obtained by the least squares fitting method, according to local deformation characteristic, the results show SMA can bear more deformation before unstable deformation stage and failure.
KW - Asphalt mixture
KW - Digital image correlation method
KW - Image quality evaluation
KW - Local deformation property
UR - http://www.scopus.com/inward/record.url?scp=85014139440&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:b5b57653-d470-46f0-b1d4-40532413b105
U2 - 10.1016/j.conbuildmat.2017.02.108
DO - 10.1016/j.conbuildmat.2017.02.108
M3 - Article
AN - SCOPUS:85014139440
VL - 140
SP - 416
EP - 423
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
ER -