Structural Design Methodology for Spray Applied Pipe Liners in Gravity Storm Water Conveyance Conduits

US Transportation Collection2021PDFTech ReportNajafi, MohammadYu, XinbaoKouchesfehani, Zahra KohankarTehrani, Amin DarabnoushKorky, SeyedSerajiantehrani, RamtinRaut, SamratKampbell, EdOsborn, LynnUniversity of Texas at Arlington. Center for Underground Infrastructure Research and EducationOhio. Dept. of TransportationUnited States. Department of Transportation. Federal Highway AdministrationOhio. Dept. of TransportationUnited StatesCementCorrugated metal culvertsCostsFinite element methodLiningsLoad testsPipe culvertsPlasticsSprays (Materials)State of the practiceStructural designTrenchless Renewal MethodsSpray Applied Pipe Lining (SAPL)Culvert renewalStructural Design of CulvertsFHWA/OH-2021/10PID: 103453Final ReportTo reduce high cost of emergency repairs and disruptions to travelling public, and prior to loss of host pipe integrity and soil-structure interaction, departments of transportations (DOTs) can use polymeric or cementitious/geopolymer spray applied pipe linings (SAPLs) to renew deteriorated gravity storm conduits and culverts. The AASHTO \u2013 National Transportation Product Evaluation Program (NTPEP) developed a Technical Committee (TC) for SAPL materials to implement this technology. However, no standardized structural design methodology existed, and vendors utilized different design methodologies with some using the cured-in-place pipe (CIPP), and others using various classical analytical structural design equations developed for other purposes. Therefore, the ultimate objective of this project was to develop design equations for structural application of SAPLs for invert-cut (invert deteriorated) circular and arch corrugated metal pipe (CMP) culverts with diameters or spans between 36 and 120 in. To achieve this objective, the project methodology included literature review, survey of U.S. and Canadian transportation agencies, review of CIPP design equations, considerations for use of additional reinforcement and benefits of filling CMP corrugations with cementitious SAPLs, comparison of construction and environmental cost of SAPL with CIPP and sliplining trenchless renewal techniques, inspection and field data collection of past SAPL projects, preparation of performance specifications, soil box testing of bare and renewed CMP samples, and finite element modeling (FEM). As detailed in this report, soil box testing included both intact and invert-cut CMPs of 60-in. diameter/span for circular and arch shapes in both bare (for control test) and renewed (lined) conditions. The CMPs were renewed with polymeric and cementitious SAPLs in three different thicknesses while embedded with poorly graded sand (SP) with shallow cover. A static load with an actuator was continuously applied through a load pad on the soil surface until renewed pipe failed. The results of this project showed that both tested polymeric and geopolymer SAPLs can significantly increase the ultimate loading capacity of invert deteriorated CMPs and be considered as structural solutions.127