Evaluation of Chemical and Structural Properties of Portland Cement Concrete Madewith Marine Limestone Coarse Aggregates

摘要

A set of comprehensive evaluation tests were conducted to determine the strength,stiffness and especially durability properties of concrete made with a marine limestone aggregate (Castle Hayne) in comparison with that made with an igneous rock aggregate (Neverson). A total of nine concrete mixes of varying strengths were tested. Comparatively, the concrete made with marine limestone aggregate demonstrated (1) good freeze-thaw resistance, (2) slightly higher chloride permeability, (3) little chemical reactivity and (4) very little water-soluble chloride content. As an aggregate, marine limestone was (1) slightly less resistant to abrasion and (2) significantly less sound. Except for the five cycle sulfate soundness, the marine limestone aggregate and concrete made with marine limestone aggregate, met all applicable AASHTO and NCDOT specifications, including NCDOT special provisions for highly corrosive areas. A direct corrosion investigation is recommended.