Located in central Ontario?s cottage country and founded in 1914, the Peterborough Utilities Commission (PUC) operates as a not-for-profit organization providing safe and reliable supplies of electricity and water to the city of Peterborough, ON, Canada
Underground Shotcreting
Many tunnels and mines constructed throughout North America in the last 20 years have successfully used shotcrete as a major element of support during excavation and as part of the lining system.
You Can’t Shoot What You Can’t See
The Importance of Lighting in an Underground Environment.
Changing Methods of Sinking Vertical Shafts in Mining
The way the mining industry and contractors work with vertical shafts is changing through the introduction of technologies such as Murray & Roberts (M&R) Cementation?s advanced shaft-lining technology.
The Elevated Gam
Materials scientist and concrete expert George Yoggy has studied the shotcrete and gunite processes for more than 50 years, focusing not only on tunnel and mine construction, but also turning his eye toward watershapes.
Third-Rail Safety
There are a few things you should be aware of when working around the third rail of an electric-powered passenger train.
Changing the Traditional Shotcrete Mixture to Suit Underground Applications
Concrete mixtures used in the shotcreting process have traditionally been low-slump mixtures.
Liberty Tunnels Phase 2
The Liberty Tunnels were opened in January 1924.
Using Accelerators for Shotcreting
Are you shooting overhead and need to build up a 6 in. (154.2 mm) layer in a single pass?