Open AccessResearch on Application of Single Component Polyurea in Defect Treatment of Expansion Joints of Water Conveyance Structure
Author(s) -
Kun Li,
Fuying Qian,
Meng Li,
Sunzhi Heng
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/560/1/012029
Subject(s) - polyurea , aqueduct , expansion joint , component (thermodynamics) , joint (building) , ultimate tensile strength , composite material , structural engineering , materials science , engineering , forensic engineering , thermodynamics , physics , archaeology , history , coating
According to the operating features of aqueducts of water conveyance structures in cold regions, this paper proposed a flexible rehabilitation plan of water sealing by single component polyurea on the surface of expansion joint of an aqueduct. The author conducted a laboratory test to study the tensile strength, bond strength, impermeability, frost resistance and aging resistance of the single-component polyurea. The results showed that the single component polyurea has strong impermeability and frost resistance, excellent aging resistance, large elongation, and high viscosity with concrete. Therefore, the single-component polyurea is suitable for the defect treatment of concrete expansion joints. In a defect treatment project of an aqueduct in the North, a flexible rehabilitation plan of water sealing by single component polyurea was implemented on the defective expansion joint of an aqueduct, and the operation effect still remained good after 3 years. The flexible rehabilitation plan of water sealing is simple and reliable because it does not damage the overall structure of the concrete and is easy to be maintained.