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99564 ANALYSIS OF A CORROSION FAILURE ON A PRESTRESSED CONCRETE CYLINDER PIPE

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Product Number: 51300-99564-SG
ISBN: 99564 1999 CP
Author: Risque L. Benedict
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In the arid or semi-arid western part of the United States, there are special parameters that may require investigation to determine whether the right-of-way soils are comosive to cementitious-coated pipe. Cyclical wetting and drying, especially in arid environments, can cause an increase in chloride concentration in the capillary system of mortar by a factor of at least five. Under the right circumstances, with cyclical wetting and drying, a soil chloride content of 140 mg/kg will exceed the corrosion threshold of 700 mg/kg and initiate corrosion on prestress wire. Several actual field examples encountered in an investigation on a PCCP failure are described. Also included is a simple field test to quickly and economically determine which combinations of gravel, sand, and silty clay that are helpfid in predicting both the likelihood and severity of cyclical wetting and drying stimulated corrosion on prestress concrete cylinder pipe. Other parameters examined were mortar properties of thickness, compressive strength, absorption, density, pH and total alkalinity vs. chloride penetration into the mortar, and degree of corrosion on prestress concrete cylinder pipe. Keywords: Cyclical wetting and drying, prestress concrete cylinder pipe, mortar absorption, density, pH and total alkalinity, total acidity, redox, Apparent Corrosion Intensity Profile
In the arid or semi-arid western part of the United States, there are special parameters that may require investigation to determine whether the right-of-way soils are comosive to cementitious-coated pipe. Cyclical wetting and drying, especially in arid environments, can cause an increase in chloride concentration in the capillary system of mortar by a factor of at least five. Under the right circumstances, with cyclical wetting and drying, a soil chloride content of 140 mg/kg will exceed the corrosion threshold of 700 mg/kg and initiate corrosion on prestress wire. Several actual field examples encountered in an investigation on a PCCP failure are described. Also included is a simple field test to quickly and economically determine which combinations of gravel, sand, and silty clay that are helpfid in predicting both the likelihood and severity of cyclical wetting and drying stimulated corrosion on prestress concrete cylinder pipe. Other parameters examined were mortar properties of thickness, compressive strength, absorption, density, pH and total alkalinity vs. chloride penetration into the mortar, and degree of corrosion on prestress concrete cylinder pipe. Keywords: Cyclical wetting and drying, prestress concrete cylinder pipe, mortar absorption, density, pH and total alkalinity, total acidity, redox, Apparent Corrosion Intensity Profile
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98637 CATHODIC PROTECTION CRITERIA FOR PRESTRESSED CONCRETE PIPE

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99543 IN SEARCH FOR CRITERIA TO AVOID EMBRITTLEMENT ON PRESTRESSED CONCRETE PIPE

Product Number: 51300-99543-SG
ISBN: 99543 1999 CP
Author: Risque L, Benedict, Richard O. Lewis
Publication Date: 1999
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Some of many hundreds of miles of prestressed pipe installed in the late 1960’sand 1970’s have failed due to corrosion of the prestressing wire. Is it safe to follow conventional CP protection guidelines?  Should the protection criteria be selected by age and condition of the pipeline, physical and mechanical properties of the wire, and the environmental conditions surrounding the pipeline?
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