Soil Box Testing Details of Spray Applied Pipe Linings as a Structural Renewal for Gravity Storm Water Conveyance Conduits

Departments of transportation (DOTs) can use spray applied pipe linings (SAPLs) to renew deteriorated gravity storm conduits and culverts if discovered prior to loss of soil-structure interaction. The American Association of State Highway Transportation Officials’ (AASHTO’s) National Transportation Product Evaluation Program (NTPEP) has developed a Technical Committee (TC) for spray applied pipe lining (SAPL) materials in an effort to implement this new technology. The SAPL TC consists of DOTs and manufacturers of resin-based and cementitious based materials. To develop standardized structural design methodologies for both cementitious- and polymer SAPLs and prepare performance specifications, Center for Underground Infrastructure Research and Education (CUIRE) at the University of Texas at Arlington is conducting soil box testing of these materials sprayed over invert-cut circular and arch-shaped corrugated metal pipes (CMPs) to minimize the load carrying capacity of the CMP.. A 330-kip MTS actuator is used to load 5-ft diameter CMPs lined with different thicknesses of SAPLs. Poorly graded sand is used for embedment. The objectives of this paper are to describe details of soil box testing, such as pipe samples, embedment, and loading rate. The results of testing along with survey of DOTs and field inspections of actual SAPL installations will provide basis for developing design equations and performance specifications.