CEMENTITIOUS LININGS     Cementitious Lining of Small Diameter Pipes Today, local, state and federal engineers in the highway departments are facing the failure of storm drains installed decades ago. The options for repair traditionally have been expensive and disruptive to traffic. There is a new method and material that has been developed to line these failing drains without disrupting the normal traffic flow. We successfully and efficiently re-line corrugated steel drain pipes to extend their life. By filling in the missing and damaged sections of the invert and lining the pipe with a 1 inch thick high strength shotcrete, soil erosion beneath the culvert and road is prevented and the life expectancy of the pipe and the roadway is extended. This is the fastest, most effective, non-disruptive method to repair failing storm drains or to extend the life of newer ones. The pipe is usable 24 hours after lining. Using a remote controlled track robot mounted with CCTV cameras and a rotary applicator allows us to bring the concrete hose and application equipment to the point of placement eliminating the need for confined space entry and all the restrictions and safety issues related to it. The proprietary mix that we use allows this high strength shotcrete to develop a compressive strength of 6000+ PSI in 7 days. Engineering studies have indicated a 1-inch thick lining of this material on the inside of the pipe will improve the load carrying capability to H80. Being virtually impermeable to water, this material has high abrasion and acid resistance and non-shrink properties. This makes the material ideal for lining pipes that carry large amounts of solids and/or acidic flows. Flow within the corrugated pipe is increased substantially after the lining process is completed. Specially designed equipment allows this material to be remotely applied in a consistent thickness up to 2 inches and in pipes that have many deflections and angles both vertical and horizontal. The cost of relining a pipe, being a fast non-disruptive process and the ability to reline pipes that other systems cannot makes this system desirable for managers that need to fix many pipes within a certain budget. Concrete historically has been proven to be an exceptional material for conveying water and water with high amounts of solids. We have provided this service for Colorado Department of Transportation on over a thousand feet of 2-foot diameter corrugated pipes. Over 2,500 feet of 42-inch pipe was lined for the Union Pacific Railroad in Hotchkiss , Colorado. Pumping through 550 foot of 1½ inch concrete hose, we lined the pipe at 400+ foot a day for 6 consecutive days. A severely misaligned 110 foot 36 inch pipe in Grand Junction, Colorado was relined for Mesa County in less than 2 hours. Union Pacific Railroad - Hotchkiss, CO Click on an image below to enlarge   Before After Before After Before After Brochure Mesa County - Grand Junction, CO Click on an image below to enlarge Inlet before Inlet after Outlet before Outlet after Brochure Track Robot video clips Video - Low resolution WARNING: Large file (3.7Mb) Video - High resolution WARNING: Very large file (18.1Mb, recommended for high bandwidth users only)