MR87-1_REDUCED.pdf

Iowa Department of TransportationMr. Bob Stoker, Assistant Road Engineer , andMr . Roger Bierbaum , Methods EngineerApril 17, 1987CULVERT PIPE USAGE SURVEY1. Does your State specify Corrugated Metal Pipe (CMP) orReinforced Concrete Pipe (RCP) or do you allow the con tractorthe option of using either type of material for culverts onnew construction?All X-Road drainage structures on their Interstateand Primary systems are required to be concrete .The secondary or county system is designed,constructed , etc., by the coun ties who generallyfollow Iowa Department of Transportationspecifications and procedures.Iowa Department of Transportation allows CSP andRCP as alternate on entrance and secondary sideroad X-Road drainage.2 . What is the policy u sed to determine which type of culvertpipe is used at various locations?Based on past observed good performance of concrete .Do not do any special testing . Also, see Number 1 .3 . Do you have a specified design life for the following? Ifso, how long?a. Roadbed - They do not have a set policy. yrs .Co nsidered indefinite .b. Pipe Culverts No yrs.c. Concrete Box Culverts-Structural Plate Pipe4. Do you use Coated Corrugated Metal Pipe? If so, whatcoatings are used and for what conditions?Noyrs.Bituminous Coated , Polymer Coated and Aluminum CMPare allowed as alternates o n entrance , secondaryside roads when special conditions exist but areseldomly used .5 . What is the average cos t per linear foot for the followingpipe, including install ation :a .b .2 4" CMP24 " RCP- 105 -