Semnan University Press Journal of Rehabilitation in Civil Engineering 2345-4415 11 1 2023 02 01 Impact Resistance of Concrete Containing LLDPE–Waste Tire Rubber and Silica Fume 60 75 6227 10.22075/jrce.2022.23456.1511 EN Imad A. Khalhen Ph.D. Student, Department of Civil Engineering, Razi University, Kermanshah, Iran Reza Aghayari Associate Professor, Department of Civil Engineering, Razi University, Kermanshah, Iran Journal Article 2021 05 19 Some of the desirable properties of concrete include high impact resistance and great energy-sucking capacity to name a few. These properties can be improved through the use of sustainable materials. This study investigated the effects of partly replacing fine aggregate with linear low-density polyethylene (LLDPE) and waste rubber (WR) as fine aggregates on the efficiency of concrete under impact loading. Two water to binder ratio (W/B) percentages of (0.40 and 0.55) were selected, with six (LLDPE-R) replacement grades (0%, 5%, 10%, 15%, 20%, and 30%) and two silica fume (SF) replacement grades (0% and 15%). Six cylinders with 150 and 60 mm were subjected to an impact by a 4.45 kg hammer striking. Test results indicated that impact resistance for the first visible crack and the ultimate failure increased with LLDPE-R content, where it increased by 4.76 times. This study also demonstrated that the impact resistance for the first visible crack of LLDPE-R concrete was improved by an average of 295% for specimens without SF and 292% for specimens containing SF. This enhancement for the ultimate failure is 291% and 290% for specimens without SF and containing SF, respectively. https://civiljournal.semnan.ac.ir/article_6227_11be81cf91409cee7de553349d6ecda2.pdf