Further challenges are the variety in host conduit material types, level of deterioration, shapes, embedment materials, types of roads, depth of cover from road surface, size (diameter or span), length, condition of substrate, accessibility, wide geospatial distribution, groundwater, and environmental exposures that makes every single culvert unique. Failure of these conduits is costly for DOTs directly due to emergency cost of replacement of the failed conduit and indirectly due to social costs of traffic interruptions and inconvenience to commuters. The results present a strong need for SAPL performance construction specifications, a standard design methodology, a robust quality control protocol, postinspection requirements, and recommendations for SAPL installation improvements.Ĭulverts and drainage structures are an integral part of roadway assets that deteriorate overtime and require maintenance and renewal. The data collected through the field inspection are used to assess the structural conditions of these projects. The second objective of this paper is to make suggestions for development of proper performance construction specifications to prevent SAPL potential problems. Therefore, the first objective of this paper is to conduct field data collections and in situ inspections of recent SAPL projects to identify renewal defects and installation issues. Identifying potential problems after installation can be considered during planning and design of SAPL. This study is part of a broader research project to develop a standard design methodology for this renewal method. The inspections were focused on large-diameter corrugated metal pipes (CMPs) and reinforced concrete pipes (RCPs) renewed with cementitious and geopolymer SAPLs. This paper assessed the existing conditions of 24 culverts renewed with SAPL in the states of Delaware, Florida, Minnesota, New York, North Carolina, Ohio, and Pennsylvania by considering various physical and operational factors. Most lining vendors utilize the cured-in-place pipe (CIPP) design methodology as specified in a current standard, and others use various analytical structural design approaches. However, currently no standard design methodology exists for SAPL. SAPLs can be a key strategy in extending service life and managing the future issues expected from the aging network of gravity pipes and culverts. The primary SAPL materials generally fall into two broad categories of cementitious and poly-meric materials. The results showed that the proposed analytical approach which is derived from Marston's Iowa equation is in an acceptable conformity with the test results.Ī structurally spray-applied pipe lining (SAPL) is a trenchless method to inhibit further deterioration and structurally renew deteriorated pipes, culverts, and drainage structures. Once the pipes were backfilled, they were renewed with geopolymer SAPL. The CMP samples were buried under 2 ft of soil cover. The invert of these CMPs were cut to simulate fully invert-deteriorated culverts in field conditions to eliminate ring stiffness of the host pipe and to maximize the applied load on the geopolymer SAPL. The soil box testing includes CMPs with 6 ft in length and 60 in. The outcomes are compared and verified with a set of large-scale soil box testing. This paper proposes a design methodology framework for flexible culverts renewed with geopolymer SAPL through an analytical approach.
However, there is no known standard design methodology available for SAPLs.
SAPL is widely used by departments of transportation (DOTs) and municipalities. SAPL can enhance structural and hydraulic capacity of deteriorated conduits. Spray applied pipe lining (SAPL) is a trenchless technology renewal technique for gravity flow conduits such as culverts, storm drain, storm sewer, etc.
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