Comprehensive Study on the Behavior and Performance of Polymer Matrix Composites in Concrete

– Polymer matrix composites (PMCs) represent a class of advanced construction materials capable of substantially improving the mechanical performance and long-term durability of concrete structures. This study presents an experimental investigation into the incorporation of epoxy resin powder as a 7% cement replacement in M40 grade concrete to assess its influence on compressive strength development. Standard 150 mm cube specimens were cast and tested at 7, 14, and 28 curing days per IS 516:1959 and IS 456:2000 protocols. The results demonstrate a progressive strength gain from 29.37 N/mm² at 7 days to 42.81 N/mm² at 28 days, exceeding the M40 characteristic target by 7.0%. A coefficient of variation below 2% across all test ages confirms outstanding mix uniformity attributable to enhanced interfacial transition zone (ITZ) densification through epoxy nano-film formation. The findings validate 7–8% PMC dosage as an optimal replacement level for M40 concrete and establish its practical suitability for structural elements in seismic Zone III. The study contributes to the growing body of knowledge supporting polymer-modified concrete as a durable, high-performance, and sustainable material for modern civil infrastructure.