Chloride Penetrability of Concrete Composites Madewith Illinois PCC Bottom Ash Used to ConstructTemporary Road Barriers

摘要

Within the past decade, several studies related to the use of coal combustion products (CCPs)rnfrom burning of pulverized coal have been completed. These studies have shown promisingrnresults for the construction of several value added products. Where concrete comes in contactrnwith de-icing salts, e.g., concrete pavements and temporary road barriers, ability of concretes tornresist chloride ion penetration is considered an important property of the concretes. Anrnexperimental study was recently completed to evaluate resistance to chloride ion penetration ofrnconcrete composites made by replacing all or part of the natural fine aggregate with Illinois PCCrnbottom ash. The results from the tests on concrete composites were compared with those from anrnequivalent conventional concrete. The tests were performed using rapid test for penetrability ofrnchloride ions into concretes specified by ASTM C1202-97. This paper presents the testingrnprocedure used in the investigation and detailed results obtained from laboratory tests performedrnon concrete composites and an equivalent conventional concrete. The results presented showrnthat resistance to chloride ion penetrability of concrete composites is lower than that of anrnequivalent concrete at early curing ages. However, beyond a curing age of 28 days, resistance ofrnconcrete composites was observed to be higher than that of an equivalent conventional concrete.