A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PCCP Rehabilitation with Fiber-Reinforced Polymer Composite: Confirming Installation Conditions
This paper presents a case study for the development and implementation of quality assurance and quality control measures for the most critical procedures for structural rehabilitation of prestressed concrete cylinder pipes (PCCP) with fiber-reinforced polymer (FRP) composites. The majority of large-diameter water transmission mains nationwide are made of PCCP. Many of the transmission mains have been in service for well over 50 years and are at risk of the failure because of the number of years they have been in service. One of the standard ways to repair PCCP pipelines is to use fiber-reinforced polymers, including glass- (GFRP) and carbon fiber (CFRP) composites. The installation of FRP structural liner inside the pipe includes many operations, such as preparation of the pipe substrate, fiber saturation, etc. Each step of the technological process may compromise the structural integrity of the repair, if performed with deviation from the specifications. One of the most critical procedures for the installation of the internal FRP structural liner is adequate preparation of the substrate (inner core concrete and metal rings) to ensure sufficient bond of the FRP liner material. Nondestructive testing methods are used to confirm the adequacy of the existing inner core concrete strength and to ensure satisfactory concrete preparation to comply with the new standard being developed by AWWA. The strength of the inner core concrete was determined with measurement of the transmission velocity of compression and shear waves. These velocity values are used to determine the elastic deformational characteristics of the concrete and empirically determined strength values. The volume of FRP repairs is constantly growing and quality control procedures for the structural rehabilitation of the PCCP with FRP composites become more critical. This paper and presentation will serve to highlight the most critical issues of the quality control for FRP liners and how to ensure adequacy of the substrate preparation.
PCCP Rehabilitation with Fiber-Reinforced Polymer Composite: Confirming Installation Conditions
This paper presents a case study for the development and implementation of quality assurance and quality control measures for the most critical procedures for structural rehabilitation of prestressed concrete cylinder pipes (PCCP) with fiber-reinforced polymer (FRP) composites. The majority of large-diameter water transmission mains nationwide are made of PCCP. Many of the transmission mains have been in service for well over 50 years and are at risk of the failure because of the number of years they have been in service. One of the standard ways to repair PCCP pipelines is to use fiber-reinforced polymers, including glass- (GFRP) and carbon fiber (CFRP) composites. The installation of FRP structural liner inside the pipe includes many operations, such as preparation of the pipe substrate, fiber saturation, etc. Each step of the technological process may compromise the structural integrity of the repair, if performed with deviation from the specifications. One of the most critical procedures for the installation of the internal FRP structural liner is adequate preparation of the substrate (inner core concrete and metal rings) to ensure sufficient bond of the FRP liner material. Nondestructive testing methods are used to confirm the adequacy of the existing inner core concrete strength and to ensure satisfactory concrete preparation to comply with the new standard being developed by AWWA. The strength of the inner core concrete was determined with measurement of the transmission velocity of compression and shear waves. These velocity values are used to determine the elastic deformational characteristics of the concrete and empirically determined strength values. The volume of FRP repairs is constantly growing and quality control procedures for the structural rehabilitation of the PCCP with FRP composites become more critical. This paper and presentation will serve to highlight the most critical issues of the quality control for FRP liners and how to ensure adequacy of the substrate preparation.
PCCP Rehabilitation with Fiber-Reinforced Polymer Composite: Confirming Installation Conditions
Gipsov, Michael (author) / Fisk, Paul S. (author)
Pipelines 2014 ; 2014 ; Portland, Oregon
Pipelines 2014 ; 346-357
2014-07-30
Conference paper
Electronic Resource
English
PCCP Rehabilitation Using Retrofitted Dowel Bars
| British Library Conference Proceedings | 1995