The National Academies Press

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From page 21... ... 19 CHAPTER FOUR PIPE MATERIALS Definition of Useful Service Life Durability requirements vary considerably between agencies owing to the very wide range of environments encountered and the agencies' different durability requirements. In practice, the expected service life of concrete pipe is generally 75 to 100 years. Read the entire page →
From page 22... ... 20 • A study commissioned by Ohio DOT (Mitchell et al. Read the entire page →
From page 23... ... 21 being concrete spalling caused by corrosion of reinforcement (Figure 21) Read the entire page →
From page 24... ... 22 If either interior or exterior acidic conditions are estimated or encountered, and cannot be alleviated by other countermeasures, the following special acid protection provisions are recommended by the ACPA (2008) : • Increased total concrete alkalinity • Increased/sacrificial concrete cover • Use of protective coatings • Use of low permeability and/or alkaline (e.g., limestone) Read the entire page →
From page 25... ... 23 includes such factors as depth of steel cover, chloride and sulfate concentrations, and concrete mix in its equation, which the other models do not explicitly incorporate. Potter (1988) Read the entire page →
From page 26... ... 24 cal processes. The majority of failures in metal pipes are attributed to corrosion, which can degrade both the inside (flow side) Read the entire page →
From page 27... ... 25 The expected material service life (EMSL) of polymercoated steel pipes is generally calculated by adding on a number of years to the service life obtained from estimates for plain galvanized steel pipe. Read the entire page →
From page 28... ... 26 nia method and the AISI modified California method. The deterioration rates are based on the pH and resistivity of the flow and soil. Read the entire page →
From page 29... ... 27 power relationship between corrosion and thickness (Molinas and Mommandi 2009) Read the entire page →
From page 30... ... 28 eight times longer than what the California method predicted for galvanized pipe. Caltrans (2011a) Read the entire page →
From page 31... ... 29 that affected the aluminum culvert service life. According to Caltrans (2011b) Read the entire page →
From page 32... ... 30 Asphalt Mastic Asphalt mastic (AASHTO M 243M) is typically not used in conjunction with lining or invert paving. Read the entire page →
From page 33... ... 31 • Polyvinyl chloride (PVC) pipe shall comply with the requirements of AASHTO M 278 for solid wall pipe, ASTM F679 for corrugated pipe, and AASHTO M 304 for profile wall pipe. Read the entire page →
From page 34... ... 32 • The pipe shall be installed within 2 years from the date of manufacture (this is to avoid the possibility that the pipe has been stored for long periods with exposure to sunlight before delivery to site) Read the entire page →
From page 35... ... 33 vitrified clay pipe materials has not materially changed from the NCHRP Synthesis 254, and the summary provided in that document is generally restated in the following paragraphs. Vitrified clay pipe is a well-established pipe that has been used for more than 100 years. Read the entire page →

From page 21...

... 19 CHAPTER FOUR PIPE MATERIALS Definition of Useful Service Life Durability requirements vary considerably between agencies owing to the very wide range of environments encountered and the agencies' different durability requirements. In practice, the expected service life of concrete pipe is generally 75 to 100 years.