Sensitive Strain Gauge Testing of Large-Diameter Culvert Rehabilitation

Angus W. Stocking, L.S.

In March 2010, an unusually configured culvert passing under Florida State Route 16 was rehabilitated with Permacast® PL-8000, a high strength, fine aggregate composite concrete, formulated by AP/M Permaform.

Florida Department of Transportation (FDOT) has been monitoring the project closely, with the structural integrity of the rehabilitation of particular interest. PL-8000, whether applied with AP/M Permaform’s CentriPipe® SpinCaster, or in special cases such as the SR16 project, sprayed onto the internal walls of failing structures, is engineered to provide a structurally sound pipe or culvert, independent of the failing substrate.

The material is a high strength, high build, abrasion resistant and corrosion resistant fine aggregate concrete based on advanced cements and additives. Graded quartz sands are used to enhance particle packing and further improve the fluidity and hardened density. The resultant concrete possesses excellent thin-section toughness, high modulus of elasticity, and self-bonding properties. Fibers are added to aid in the casting process, for increased cohesion, and to enhance the flexural strength of the liner. It is a very strong material, and outstanding for sewer and pipe rehabilitation.

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