TY - JOUR
T1 - New insights into autogenous self-healing in cement paste based on nuclear magnetic resonance (NMR) tests
AU - Huang, Haoliang
AU - Ye, Guang
AU - Pel, Leo
PY - 2016/7/1
Y1 - 2016/7/1
N2 - The aim of this study is to investigate the effect of water migration from cracks into the bulk paste on autogenous self-healing. Nuclear magnetic resonance (NMR) technique was utilized to monitor water migration from cracks into the bulk paste during the process of autogenous self-healing. NMR results show that initially the water in the crack migrates into the bulk paste and the water content of the bulk paste increases significantly. However, after 5-h autogenous self-healing, the amount of non-chemically bound water in the bulk paste (adjacent to the crack surfaces) determined by NMR decreased instead. It indicates that some of the water coming from the crack was used for additional hydration of unhydrated cement particles in the bulk paste (during the process of autogenous self-healing). Before this study, in term of autogenous self-healing only the recoveries that related to the filling of cracks were concerned. The observation and quantification of densification of cement paste adjacent to the crack surfaces provides a new insight into autogenous self-healing.
AB - The aim of this study is to investigate the effect of water migration from cracks into the bulk paste on autogenous self-healing. Nuclear magnetic resonance (NMR) technique was utilized to monitor water migration from cracks into the bulk paste during the process of autogenous self-healing. NMR results show that initially the water in the crack migrates into the bulk paste and the water content of the bulk paste increases significantly. However, after 5-h autogenous self-healing, the amount of non-chemically bound water in the bulk paste (adjacent to the crack surfaces) determined by NMR decreased instead. It indicates that some of the water coming from the crack was used for additional hydration of unhydrated cement particles in the bulk paste (during the process of autogenous self-healing). Before this study, in term of autogenous self-healing only the recoveries that related to the filling of cracks were concerned. The observation and quantification of densification of cement paste adjacent to the crack surfaces provides a new insight into autogenous self-healing.
KW - Additional hydration
KW - Autogenous self-healing
KW - Cement paste
KW - Nuclear magnetic resonance (NMR)
KW - Water migration
UR - http://www.scopus.com/inward/record.url?scp=84971645687&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:0a38dc62-755a-42f8-9da9-bbe875f3d373
U2 - 10.1617/s11527-015-0664-9
DO - 10.1617/s11527-015-0664-9
M3 - Article
AN - SCOPUS:84971645687
SN - 1359-5997
VL - 49
SP - 2509
EP - 2524
JO - Materials and Structures
JF - Materials and Structures
IS - 7
ER -