TY - JOUR
T1 - Preliminary Investigation of an Approach to Improve Water Impermeability in Concrete with Externally Bonded FRP Systems
AU - Jiang, Cheng
AU - Lai, Wallace Wai Lok
AU - Sham, Janet Fung Chu
AU - Lin, Guan
N1 - Funding Information:
The authors are grateful to Professor Jin-Guang Teng at The Hong Kong Polytechnic University for his many discussions and advices in this study. The authors are grateful for the financial support received from the Research Grants Council of the Hong Kong Special Administrative Region (Project No. T22-502/18-R). The authors are also grateful to CASTCO Testing Center Limited and Dr. Mick Atha for their supports of experiments and language improvement in this paper, respectively.
Publisher Copyright:
© 2021 American Society of Civil Engineers.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - Good bond and water impermeability in fiber-reinforced polymer (FRP) bonded/coated systems are essential if the durability of FRP-rehabilitated concrete structures is to be ensured. In addition, water impermeability is required in some special FRP applications, such as the strengthening of underground water pipes. So far, there has been no method in the literature guaranteeing water impermeability in FRP strengthening works. This paper studies the feasibility of using a waterproof coating as the initial primer on cementitious materials before applying externally bonded FRP. In this preliminary investigation, by examining the two most important indicators (i.e., pull-off bond tests and water penetration tests), it was found that the use of an initial waterproof layer in the proposed FRP bonding system did not influence the pull-off bond strength but significantly improved the system's water impermeability. It is, therefore, suggested that an initial waterproof layer can be included in method statements for externally bonded FRP systems to upgrade the effectiveness and durability of FRP systems.
AB - Good bond and water impermeability in fiber-reinforced polymer (FRP) bonded/coated systems are essential if the durability of FRP-rehabilitated concrete structures is to be ensured. In addition, water impermeability is required in some special FRP applications, such as the strengthening of underground water pipes. So far, there has been no method in the literature guaranteeing water impermeability in FRP strengthening works. This paper studies the feasibility of using a waterproof coating as the initial primer on cementitious materials before applying externally bonded FRP. In this preliminary investigation, by examining the two most important indicators (i.e., pull-off bond tests and water penetration tests), it was found that the use of an initial waterproof layer in the proposed FRP bonding system did not influence the pull-off bond strength but significantly improved the system's water impermeability. It is, therefore, suggested that an initial waterproof layer can be included in method statements for externally bonded FRP systems to upgrade the effectiveness and durability of FRP systems.
KW - Bond strength
KW - Cementitious materials
KW - FRP
KW - Pull-off test
KW - Water impermeability
KW - Water penetration test
UR - http://www.scopus.com/inward/record.url?scp=85114279140&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CC.1943-5614.0001158
DO - 10.1061/(ASCE)CC.1943-5614.0001158
M3 - Journal article
AN - SCOPUS:85114279140
SN - 1090-0268
VL - 25
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
IS - 6
M1 - e0001158
ER -