Environmental and Construction Cost Analysis of Trenchless High Density Polyethylene (HDPE) Sliplining Renewal Method in Large Diameter Culverts

Sustainability has become a trend in recent years in stormwater infrastructure management and will need to be practiced in perpetuity. Trenchless rehabilitation technologies are sustainable and innovative techniques for the renewal of stormwater drainages. Sliplining is a trenchless technology solution for rehabilitation of large diameter stormwater drainages that provide structural support for severely damaged host pipes. Trenchless sliplining is installed by inserting a smaller new pipe into a host pipe. This technology requires grouting the annular space between the two pipes and sealing the ends. Environmental costs include all the costs associated with the rehabilitation of stormwater drainages considering the complete life cycle, starting from the production of raw materials to the final disposal of the products. Construction cost is the original cost, including the direct and indirect costs of the project. The available information of the bid tabs and materials, manufacturing, processes, transportation, and disposal are used to analyze the environmental and construction costs associated with a trenchless sliplining renewal project. The objective of this paper is to conduct the environmental and construction cost analysis of sliplining using HDPE pipe for culverts. The environmental cost analysis was carried in SimaPro using TRACI method. Results show that carbon dioxide and ozone are the major emissions in sliplining renewal process that can lead to global warming and smog, respectively. Also, environmental costs consist of 7% of the total environmental and construction costs of a sliplining project in large diameter culverts. It can be concluded that the environmental costs of sliplining is an important component when considering sustainable stormwater infrastructure management. This study can be useful for analyzing the environmental and construction costs of other trenchless renewals for large diameter culverts with different project conditions.