Waterproofing Evaluation of an Irrigation Channel-use Early Age Sealants under Back Water Pressure

Abstract

Joint filling using single-component sealants is commonly employed in the repair of joints in irrigation channels, owing to its ease of use and economic efficiency. However, sometimes a single-component sealant becomes deformed soon after it is applied due to swelling, rupture, or leakage under the impact of back water pressure. This study focused on sealants for irrigation channels, and hardening confirmation tests and water pressure resistance tests were conducted, with evaluated the impact of deformation on the waterproofing of early-age sealants. The results show that at a low temperature of 0 ℃, each sealants manifested strength about 1 to 2 weeks later than at a temperature of 23 ℃. Additionally, when the acting water pressure exceeded 0.02MPa, balloon-shaped swelling and rupture of the single-component and two-component sealants occurred, reducing waterproofing. The results also revealed that the fast-hardening, three-component sealant is highly resistant to deformation caused by water pressure.