Connection Between PVC Pipe and Concrete Manhole in Different Schemes

Abstract Precast concrete manholes are essential in infrastructure management systems, allowing directional adjustments and connections in the sewerage system and serving as vital maintenance points. The connection between the concrete manhole and the PVC pipe is one of the most essential components of sewerage networks. In addition, quality bonding materials and Sealing provide substantial durability in harsh environmental conditions. However, external factors and internal corrosion result in connection failure, and sewage is released into the surrounding environment, leading to pollution. However, limited studies have been conducted about the connection between the pipe joint and the concrete manhole. Therefore, the study aims to find the most effective method connection by proposing three techniques with different materials. The test utilized a manhole concrete with a 44 cm diameter entrance connected to a 40 cm PVC pipe, advanced sealants based on polymers, epoxy, polyurethane, and modified cementitious materials. Fly ash was added at 25% of the cement weight to all cementitious materials employed in the paper. The Exfiltration test was carried out, and the water level was measured to test the resistance of the materials to leakage. The study indicated that the leakage ratio of the first method was 0.36% of the standard leakage test, providing it superior in leakage resistance. Additionally, the leakage ratio of the second method was 1.81% higher than the leakage test standard. In contrast, the third method showed a leakage ratio of 1% from the standard leakage test. The leakage ratio of the conventional method was 10.90% higher than the standard leakage test, making it the least effective among alternative methods. The results indicate that advanced leakage systems offer efficient and effective ways of closing the gap, improving the efficient and reliable connection between the manhole and the pipe, and enhancing the system’s ability to withstand environmental conditions. Consequently, diminishing the probability of leakage. Additionally, cement-based techniques showed potential effectiveness, provided that the internal composition of the material and the application method align with the requirements for leak resistance and structural durability.