Evaluation of calcium silicate and calcium aluminate concretes for Internal pipeline corrosion protection.

摘要

A variety of industrial-standard and experimental concretes are being evaluated for use in brine disposal pipelines operated by the US Strategic Petroleum Reserve (SPR). This paper reports on interim performance results from on-going studies involving an American Petroleum Institute (API) standard calcium silicate-based (CS) concrete and a commercially available calcium aluminate-based (CA) concrete. Samples exposed to non-flowing SPR brine in the field were returned to the laboratory at regular intervals for analysis. Electron probe microanalysis (EPMA) determined the depth of brine penetration and the amount of concrete deterioration. Corrosion occurring at steel pipe/concrete interfaces during exposure to simulated brine has been studied on laboratory-constructed specimens using electrochemical impedance spectroscopy (EIS).