Fly-ash conjoined ground granulated blast furnace slag proxy for fresh and hardened responses

Abstract The cement business is the second-largest source of greenhouse gas emissions after the oil and gas industry. As the demand for cement in the construction business increases, the environment is affected; therefore, wastes such as GGBS and fly ash are used instead of cement. Comparing the strength performance of M25 concrete, its constant fly ash content is 20%, and GGBS is used to replace 10%, 20%, 30%, 40%, and 50% of the cement part, and compared with PCC. The replacement concrete's Vee-Bee test, compression ratio, and mechanical strength (tensile, compressive, and flexural strength) were also tested. For M25 concrete, samples were taken at 3, 7, 14, 21, and 28 days after increasing the setting time were analyzed. The settlement, compaction coefficient, and mechanical strength of the concrete were analyzed, containing GGBS and fly-ash. The results show that adding GGBS and fly ash to the concrete improves the cooling and hardening performance, thereby improving the mechanical properties of the concrete. With 30% GGBS and 20% fly ash, and a water/cement ratio of 0.42, the workability and mechanical qualities were the greatest. The strength features of GGBS concrete provide a sense of security and encourage researchers in the construction trade to use it all the time. Cement production causes Environmental problems, and it has been solved by finding alternative materials for products such as fly ash and GGBS.