These grouting projects were implemented using specifications largely consistent with the new NASSCO grouting specifications. This paper will review the requirements for testing and grouting under which the original work was done.
There have been many debates regarding the long term effectiveness of a sewer grouting approach. ARCADIS selected 12 sewer segments that had been grouted under various sewer rehab projects for which detailed records of testing and grouting were collected.
Tunnel contractors can choose whether to use cement or chemical grouts. To help them out, Britt Babcock discusses both types, which to use, when to use them and why...and an idea of how much it will all cost.
Groundwater infiltration can be due to either primary or secondary permeability. When both types of permeability are present, mitigation requires versatility and cooperation between multiple project participants.
Over the last 6 years, Malcolm Pirnie has conducted a monitoring program of cured in place mainline liners and lateral liners to assess the affect of various variables on long term liner quality, especially with regard to liner porosity/pinhole leakage.