Experimental study of engineering properties of fiber-reinforced pozzolanic concrete and evaluation of impact effect on it: A case study of local mineral pozzolan

One of the crises facing humanity is damage to the environment. Inadequate management and attention to greenhouse gas emissions threaten human life on Earth. Given the CO2 emissions from cement production, finding a way to reduce cement consumption in concrete as the most widely used building material is a priority. In this paper, a natural pozzolan from Iran with suitable physical and chemical properties for replacing part of cement in concrete was introduced and its engineering properties were investigated. To strengthen its strength, steel and polypropylene fibers were used separately and hybrids with new mineral pozzolans were used in concrete. According to previous studies and optimizations, mineral pozzolan with a weight fraction of 15% cement in concrete was used. A comparison of the strength of local mineral pozzolan samples with other famous pozzolanic concretes showed that concrete with local pozzolan is more resistant than ordinary cement concrete. Also, concrete containing steel fibers and local pozzolan has higher compressive strength than other samples. Pozzolanic concrete samples containing a combination of steel fibers and polypropylene had better performance in flexural strength than other samples and the impact toughness of these samples was better than other samples. Investigations showed that the impact resistance of samples containing local mineral pozzolans was 3.75 and 8.33% higher than conventional cement concrete at 28 and 90 days, respectively. The test results generally indicate that the local mineral pozzolans studied can be a good option to replace part of the cement in concrete and while improving the engineering properties of concrete, not only greatly reduce cement consumption but also a valuable finding for environmental protection. Biology, construction, and production of green concrete.