Abstract. Due to its unique properties as compared to ordinary concrete, lightweight concrete play a major role in construction sector. Here, this research explain the development of lightweight self-compact concrete by replacing the coarse aggregate together the pumice stone, which is used as a lightweight material in various proportions. An investigation on the effect of coarse aggregate on the partially replaced with pumice stone in lightweight self-compact concrete is carried out. The fresh and hard property of this lightweight self-compacting concrete have been studied and compared with the results of normal concrete. Pumice stone is used due to its special property such as unit weight, heat insulation property, resistance against fire when we combined with the coating substance the properties of this concrete has been improved. Several properties of lightweight self-compacting concretes such as unit weight, flow diameter, flow diameter after an hour, V-funnel and L-box tests, 28 days split- tensile strength, dry unit test, water absorption 7- and 28-day compressive strength, and ultrasonic pulse velocity test was investigated. According to the study, lightweight self-compacting concrete properties include flow strength, segregation resistance, and filling capability of fresh concrete. Pumice stone is used by replacing with natural coarse aggregate, at the levels of 20%, 40%, 60%, 80% by volume with fly ash and blast furnace slag minerals at the constant rate of 40%. 28 days compressive strength, dry unit weights, thermal conductivity in addition to ultra-sonic velocity of self-compacting concrete were obtained. The compression, flexural, and split tensile strengths of cubes, cylinders, along with prisms are tested for 7, 14, and 28 days. Results shows that pumice stone met the requirements for structural applications.
