Comparative Analysis of Rapid Chloride Penetration Testing for Novel Reinforced Concrete Systems

69A3551847102This report provides a summary of rapid chloride penetration testing (RCPT) of ductile concrete materials. The report first introduces a range of ductile concrete materials with varying fiber types, fiber lengths, mechanical properties, material constituents, and durability performance. These materials represent various systems that have been used in several transportation projects to improve the durability of transportation infrastructure. Next, an overview of the RCPT testing program is provided and results are presented with comparisons to representative baseline concrete mixtures used in the industry today. The results show that RCPT experiments may not be indicative of resistance to chloride movement since the experiments measure charge passed, rather than chloride ingress. Recommendations for the need to calibrate RCPT results with long-term chloride ponding experiments are discussed

Designing Concrete Mixtures With RCA

69A3551847102The use of recycled concrete aggregates (RCA) as a replacement in new concrete has gained popularity worldwide as a method of reducing natural aggregate consumption. Many individual studies have been completed but little work has been done to analyze that work to make broad conclusions on RCA concrete mechanical properties. This report presents the development and analysis of a database of mechanical properties of concrete containing coarse RCA and provides an investigation the applicability of numerically generated recycled concrete aggregate (RCA) systems by varying the material properties. A sensitivity study of RCA systems was conducted through a full-factorial analysis to explore how the mixture design proportions influence the RCA concrete hardened properties. The modeling methodology was adopted by using a computational algorithm that can generate concrete systems with different RCA replacement levels to numerically simulate RAC systems under mechanical loading. Numerically simulated results are compared with an experimental database that has been established, including a substantial data set on RAC mixture design proportions. RAC geometries and material properties were stochastically generated using Monte Carlo simulation methods, resulting in 200 representative numerical models that were subjected to simulated mechanical loading