introduCtion Joint Details The concrete pipe industry utilizes a number of joint details to satisfy a broad range of performance requirements. These joints can vary in cost, as well as in performance characteristics, and field performance is dependent upon proper installation procedures. Consultation with local concrete pipe manufacturers will provide information on the availability, performance and cost of the various joints. Mastic or Mortar Joints ConCrete pipe The performance of these joints depends exclusively upon the workmanship of the contractor. Joints employing mortar joint sealants are rigid, and any deflection or movement after installation may cause cracks and leakage. Mastic sealants provide a degree of flexibility without impairing watertightness. Mastic and mortar joints are not generally recommended for any internal or external head conditions if leakage is an important consideration. Rubber Gasket Joints Concrete surfaces with or without shoulders on the tongue or the groove utilize compression type rubber gaskets. Although there is wide variation in joint dimensions and gasket cross section for this joint, most are manufactured in conformity with ASTM C 443. This joint is primarily intended for use with pipe manufactured to meet the requirements of ASTM C 14, C 76 or C 655 and may be used with either bell and spigot or tongue and groove pipe. Concrete surfaces with opposing shoulders on both the bell and spigot use O-ring, circular cross section, rubber gaskets. Basically designed for low pressure capability, these joints are frequently used for irrigation lines, waterlines, sewer force mains, and gravity or low head sewer lines where infiltration or exfiltration is a factor in the design. Meeting all the requirements of ASTM C 443, these type joints are also employed with pipe meeting the requirements of ASTM C 361. They provide good inherent watertightness in both the straight and deflected positions. Concrete surfaces with a groove on the spigot for an O-ring rubber gasket, are referred to as a confined O-ring joint. These are designed for low pressure capabilities and used for irrigation lines, water lines, sewer force mains, and sewers where infiltration or exfiltration is a factor. This joint provides excellent watertightness in both the straight and deflected positions and meets the joint requirements of ASTMC443 or C361. stormwater treatment teChnologies box seCtions gaskEt InstallatIon - PIPE Gasket Installation Self-Lube Gasket 450-1200mm Pipe 1950mm Pipe Gasket Spigot Spigot Gasket Wedge Gasket 2100-3000mm Pipe O-Ring Gasket 300-375mm Pipe C361 Pipe Gasket Spigot manhole and CatCh basin material Carefully clean all dirt and foreign substances from the jointing surface of the bell or groove end of pipe. Carefully clean all dirt and foreign substances from the jointing surface of the bell or groove end of pipe. Lubricate bell jointing surface liberally. Use a brush, cloth, sponge or gloves to cover entire inside surface. Only approved lubricant should be used. LAFARGE PIPE Carefully clean spigot or Carefully clean spigot or eMANUAL PAGE 59