The Effect of Polypropylene Fibers on the Fracture Characteristics of Lightweight Aggregate Crumb Rubber Concrete Composites

The increasing use of rubber tires and their low recycling ratio have made them a serious environmental problem. This work aims to develop investigate enhanced lightweight aggregate crumb concrete (PFLWACRC) composites regarding the fracture properties concrete. Polypropylene (PP) fibers are commonly familiar with increased crack growth endurance On other hand, reuse waste in plays major role mitigation effects climate change. Various mixtures were designed conventional Portland cement common coarse aggregates. variables considered this study PP different percentages (0.2%, 0.4%, 0.6% volume fraction), various substitution proportions (0%, 5%, 10%, 15%, 20%, 25% fine aggregates). Cement 450kg/m3 density 10% silica fume was used. characteristics, which involve toughness (KIC) energy generation (GF), all evaluated by testing two types samples, i.e. 54 notched beams dimensions 10×10×52cm cylinders diameter×height equal 15×30cm. results showed that addresses scattering limit mixtures. findings existence critical Crack Mouth Opening Displacement (CMOD)c. had limited effect on compressive strength may even reduce it, but remarkable enhancement absorption observed.