The Job
This 8″ pipe abandonment project is located outside of Washington, DC. As part of continuing waterline replacements, a utility contractor in Fort Washington, Maryland, needed to abandon 10,600LF of 8″ water main. The utility and DOT both require grouting of all utilities 6″ and larger taken out of service.
The Challenge
In order to minimize the number of placement points, the grout needed to be exceptionally mobile.
The Solution
CJGeo proposed a 30lb/cuft CJFill-Ultra Lightweight (CJFill-UL) cellular grout, and worked with the client to design a grouting plan that would allow grouting all 10,600LF of pipe from just three access points. CJGeo performed the grouting over a period of two days, with no additional excavation required from the customer other than their original tie ins/disconnects.
By cutting the pipe at three locations, it was split into roughly equal segments. Each of around two thousand six hundred feet. 30lb/cuft CJFill-Ultra Lightweight is easily pumpable this distance without yield loss.
To do this same work with flowable fill would have required approximately thirty five access points. This would be to split the pipe into roughly thirty six segments around three hundred feet, each. Even then, pumping flowable fill three hundred feet through eight inch pipe is very difficult. By using CJFill-Ultra Lightweight for this pipe abandonment project, the general contractor saved about two weeks off of their schedule, and tens of thousands of dollars.
Speak With An Expert
Facing a similar challenge to this 8″ pipe abandonment project that CJGeo performed using cellular grout? Give us a shout or shoot us a text. Click the state marker for the location of your project for contact info for the appropriate rep.
