Agenda - Council - 06/27/2017 - Laserfiche WebLink

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A2 CIPPS Structural Requirements The physical properties and characteristics of the finished liner will vary considerably, depending on the types and mixing proportions of the materials used, and the degree of cure executed. It shall be the responsibility of the Contractor to control these variables and to provide a CIPP system which meets or exceeds the minimum properties specified herein: 1. The CIPP shall be designed as per ASTM standards. The CIPP design shall assume no bonding to the original pipe wall. 2. The design engineer shall set the long term (fifty (50) year extrapolated) Creep Retention Factor at thirty three percent (33%) of the initial design flexural modulus as determined by ASTM D-790 test method. This value shall be used unless the Contractor submits long term test data (ASTM D2990) to substantiate a higher retention factor. 3. The layers of the cured CIPP shall be uniformly bonded. It shall not be possible to separate any two (2) layers with a probe or point of a knife blade so that the layers separate cleanly or the probe or knife blade moves freely between the layers. If separation of the layers occurs during testing of field samples, new samples will be cut from the work. Any reoccurrence may cause rejection of the work. Minimum Physical Properties: The cured pipe material (CIPP) shall, at a minimum, meet or exceed the structural properties, as listed in the table below. Cured Cured Composite Property Test Method Composite Per ASTM F1216 Per Design Flexural Modulus Of Elasticity (Short ASTM D- 250,000 Psi Contractor Value Term) 790 Flexural Strength (Short Term) A90TM D 4,500 Psi Contractor Value The required structural CIPP wall thickness shall be based as a minimum, on the physical properties listed above and in accordance with the Design Equations in the appendix of ASTM F 1216, and the following design parameters: Design Safety Factor 2.0 (1.5 For Pipes 36" Or Larger) Creep Retention Factor 33% Ovality 2% Or As Measured By Field Inspection Constrained Soil Modulus Per AASHTO LRFD Section 12 And AWWA Manual M45 Groundwater Depth As Specified Or Indicated On The Plans Soil Depth (Above The Crown) As Specified Or Indicated On The Plans Live Load H2O Highway Soil Load (Assumed) 120 Lb/Cu. Ft. Minimum Service Life 50 Years The Contractor shall submit, prior to installation of the lining materials, certification of compliance with these specifications and/or the requirements of the pre -approved CIPP system. Page 61