TY - GEN
T1 - Self-healing Behaviour of Ultra-High-Performance Concrete Under Constant Load
AU - Alameri, Mohammad
AU - Sadakkathulla, Mohamed Mohamed
AU - Sheikh, Abdul Hamid
AU - Elchalakani, Mohamed
N1 - Funding Information:
Acknowledgment. The authors would like to acknowledge the financial support received from Australian Research Council (DP 21001425) for undertaking this research.
Publisher Copyright:
© 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - Concrete technology has been developing remarkably in recent decades. One of the most significant developments is the invention of ultra-high-performance concrete (UHPC), which can cope with the higher level of demands associated with complex structures, such as long-span bridges. The strength and durability of this type of concrete are quite high. However, this kind of concrete needs a very low water-to-cement ratio (up to 0.2); consequently, the hydrated cement particles could not exceed 26%. Hence, the cracks may appear frequently due to the autogenous shrinkage. To overcome autogenous shrinkage, a superabsorbent polymer (SAP) is used as an internal curing agent to subsequently increase the hydration of anhydrous cement particles. Much research has focused on inducing cracks under different curing conditions and observing the behaviour of the specimens when re-loaded, whether the cracks that had been induced had sealed during the curing time, and whether strength had been gained after re-loading. As such, in this research, a constant cracking load was applied to a pull-out specimen for 28 days under two different curing conditions (water curing and wet and dry cycles). The mix design for these specimens was UHPC with SAP of 0.3% and 0.4% of the total binder. Also, a reference UHPC mix has been used for comparison purposes. The results show that using SAP in the UHPC mix has the ability to boost the self-healing mechanism present in ultra-high-performance concrete. Additionally, tensile strength behaviour improved in the UHPC mix with 0.3% SAP.
AB - Concrete technology has been developing remarkably in recent decades. One of the most significant developments is the invention of ultra-high-performance concrete (UHPC), which can cope with the higher level of demands associated with complex structures, such as long-span bridges. The strength and durability of this type of concrete are quite high. However, this kind of concrete needs a very low water-to-cement ratio (up to 0.2); consequently, the hydrated cement particles could not exceed 26%. Hence, the cracks may appear frequently due to the autogenous shrinkage. To overcome autogenous shrinkage, a superabsorbent polymer (SAP) is used as an internal curing agent to subsequently increase the hydration of anhydrous cement particles. Much research has focused on inducing cracks under different curing conditions and observing the behaviour of the specimens when re-loaded, whether the cracks that had been induced had sealed during the curing time, and whether strength had been gained after re-loading. As such, in this research, a constant cracking load was applied to a pull-out specimen for 28 days under two different curing conditions (water curing and wet and dry cycles). The mix design for these specimens was UHPC with SAP of 0.3% and 0.4% of the total binder. Also, a reference UHPC mix has been used for comparison purposes. The results show that using SAP in the UHPC mix has the ability to boost the self-healing mechanism present in ultra-high-performance concrete. Additionally, tensile strength behaviour improved in the UHPC mix with 0.3% SAP.
KW - cracks
KW - self-healing
KW - superabsorbent polymer
KW - ultra-high-performance concrete
UR - http://www.scopus.com/inward/record.url?scp=85163970705&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-32519-9_49
DO - 10.1007/978-3-031-32519-9_49
M3 - Conference paper
AN - SCOPUS:85163970705
SN - 9783031325182
T3 - Lecture Notes in Civil Engineering
SP - 506
EP - 513
BT - Building for the Future
A2 - Ilki, Alper
A2 - Çavunt, Derya
A2 - Çavunt, Yavuz Selim
PB - Springer Science + Business Media
CY - Cham
T2 - International Symposium of the International Federation for Structural Concrete
Y2 - 5 June 2023 through 7 June 2023
ER -