Geopolymer

City of Los Angeles
GeoSpray® 49" Brick Sewer

Project Overview
LA Sanitation collects, cleans and recycles solid and liquid waste generated by residential, commercial and industrial users in the City of Loa Angeles and surrounding communities.  The system serves over four million residents.  The Bureau of Engineering for the Department of Public Works is responsible for maintaining the sewer and storm water systems owned by the city.  Over the last several decades the city has worked to rehabilitate and replace much of its aging sanitary sewer system.  As the progress continues the city is now doing more work on the larger diameter piping structures in their system.  These larger diameter rehabilitations are significantly more costly then the smaller diameter repairs and many of the systems employed by the city are significantly budget constrained.
In order to test and develop alternative rehabilitation systems for these large diameter sewer structures, the city approved a pilot project with Milliken Infrastructure’s GeoSpray® geopolymer mortar in 2016. 


Solution
The pilot project was to rehabilitate 524 linear feet of brick sewer, likely installed in the early 1900s, along Rodeo Rd.  The sewer had significant loss of mortar between the bricks and damaged or missing brick.   The project consisted of several phases including: By-pass setup and testing, cleaning and pre-inspection, lining and post inspection.  A 1” GeoSpray mortar lining was applied to the structure to sever as a new structural lining for the system.  The lining was applied by hand spray so that the multiple live connections from local homes could be maintained as operational with minimal time disturbance during the lining.  The project was conducted over a 3 week period between late June and early July in the hotter summer conditions. 

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