DOI: 10.11648/j.ajcbm.20261001.14 ISSN: 2640-0057

Reliability-based Evaluation of Shredded Plastic Modified Concrete Using the Constant Failure Rate (CFR) Model

Ibrahim Abdulrazaq, Giwa Jabir, John Wasiu
Show PDF Cite
Although concrete is necessary for the world's infrastructure, its production has a substantial negative impact on the environment. The production of cement is responsible for about 8% of global CO 2 emissions, and the extraction of natural aggregate depletes limited resources. In order to minimize landfill waste and preserve natural aggregates while preserving structural integrity, this study investigates the use of shredded plastic aggregates (SPA) from post-consumer waste (such as PET and HDPE) in concrete as a sustainable substitute. Concrete mixtures with 0.5–5% SPA replacement underwent compressive strength tests at 7, 14, 21, and 28 days of curing, in accordance with ASTM C39/C39M. Long-term reliability was evaluated using the Constant Failure Rate (CFR) model was obtained from strength development rates. The findings show that over the course of 28 days, plastic-modified concrete produced compressive strengths ranging from 21.858 to 24.156 N/mm 2 , with an average strength rate of 0.6905 and an annual failure rate of 0.00619 per year. For 15 years, reliability was above 90%; at 50 years, it dropped to 73.36%, indicating that it is appropriate for applications with a moderate service life (30–35 years). SPA concrete provides improved ductility and sustainability advantages despite having a lower compressive strength because of a weaker interfacial bond. Future studies into more sophisticated probabilistic models (such as Weibull and log-normal) and field validation are necessary because the CFR model's constant failure rate assumption makes it difficult to capture intricate degradation mechanisms. By promoting the use of waste plastics in construction, this study develops sustainable concrete technologies.

More from our Archive