Cracks in Installed Reinforced Concrete Pipe
This paper explains the 0.01 inch crack used to establish the comparative strength of RCP in a three-edge bearing test and is not intended as an indication of overstressed or failed pipe under installed conditions.
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Resource # 02-712
C76 Reinforcement Design Changes and
Steel Reinforcing areas that are found in tables provide in ASTM C 76 have been developed over the years through both design and testing. This paper is a quick overview in how the steel areas for a large diameter reinforced concrete pipe were developed through tests run in Ohio.
Velocity Reduction By Internal Energy
The designer is often concerned with possible scour or erosion at the outlet of a drainage culvert constructed on a steep slope. High velocities associated with steep slopes are the critical parameter in the erosion process. Reducing the velocity of such flows are accomplished by the formation of hydraulic jumps. This article describes dissipators intended to form hydraulic jumps within culverts.
Velocity Reduction With An Outlet Expansion
This paper describes the concept of using an abrupt expansion at the outlet end of a concrete culvert for the purposes of outlet velocity reduction. The method is intended for culverts operating under conditions of outlet control at maximum discharge.
Concrete Box Sections
Cast-in-place reinforced concrete box culverts have been designed and used for many years because of special waterway requirements, unusual load conditions, or designer preference. The American Concrete Pipe Association's precast concrete box section program was implemented to develop a product for these applications and to provide an opportunity for specifiers to utilize the inherent advantages of a precast product.
Of Cracks In Reinforced Concrete Sanitary
This report summarizes the effects of cracking in a reinforced concrete pipe sanitary sewer installed for the Brazos River Authority in Texas. It presents conclusions and recommendations on the effects of cracking as related to crack depth, concrete strain, pipe deflection, and acid environment.
Of Cracks In Reinforced Concrete Culvert
This report summarizes the effects of cracking and slabbing in the Diamond Bar reinforced concrete pipe culvert installed in Los Angeles County in California. It presents conclusions and recommendations on the degree of cracking that can be tolerated in relation to the integrity and life expectancy of reinforced concrete pipe.
Factor Design Of RCP Sewers
Several factors have significantly altered the reinforced concrete pipe sanitary sewer market. These factors brought us from the dark ages, into the present situation where modern technology can be applied in the project design stage to the design of concrete pipe in a particular sulfide environment.
Of Cracks In Concrete Pipe
Precast reinforced concrete pipe is manufactured to specified strengths in accordance with American Society for Testing and Materials (ASTM) standards. Some project specifications include crack criteria as a performance limit for buried concrete pipe. This CP Info discusses cracks in precast reinforced concrete pipe, the significance of cracks with respect to durability and structural integrity, and the phenomena of autogeneous healing.
Concrete Pipe Durability
Design methods for buried pipe are fairly well established, but durability, historically, has not been given proper consideration. The definition of a durable pipe contains three variables that must be evaluated; required performance, pipe properties, and service conditions. This CP Info reviews the significance of the various physical and chemical factors, which determine the durability, design, and performance of concrete pipe.
Pressure and Bedding Factors
This paper discusses the limitations of early research by Marston and Spangler with respect to bedding factors. This is one element of SIDD (Standard Installations Direct Design), the innovative concrete pipe design method recommended by the American Concrete Pipe Association. This document presents a method for determining bedding factors for the three historical beddings, taking into consideration lateral forces and modern installation methods.