STP691

    Estimation of Ground Water Corrosion of Concrete Sewer Pipes in the Hutt Valley, New Zealand

    Published: Jan 1980


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    Abstract

    Centrifugally spun concrete pipes laid in a new sewer in the Hutt Valley were discovered to be undergoing corrosion from soft ground waters containing aggressive carbon dioxide. Petrographic examination of concrete cores from these pipes is used to estimate depth of corrosive attack and indicates that in the worst case, isolated failure due to corrosion of reinforcement will not occur before 30 years and that more general failure is unlikely before 100 years. An attempt is made to calculate the rate constants used for estimating corrosion of the sewer by examining 20-year-old experimental concrete and asbestos cement specimens buried in a similar soil type. In addition, results are reported for concrete and asbestos cement specimens buried at two other sites where corrosive ground waters are present.

    Keywords:

    concrete pipes, corrosion, soft acidic ground water, carbon dioxide, rate constants, corrosion tests, durability, building materials


    Author Information:

    St. John, DA
    Scientists, Department of Scientific and Industrial Research, Petone,

    Penhale, HR
    Scientists, Department of Scientific and Industrial Research, Petone,


    Paper ID: STP36074S

    Committee/Subcommittee: G03.06

    DOI: 10.1520/STP36074S


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