Investigation and comparison of SCFRC properties incorporating fly ash and zeolitic additives
Keywords:spent catalytic cracking, fly ash, rheology, self-compacting concrete
Various properties of self-compacting concrete (SCC) and fresh mixture attracts the researchers and civil engineers’ interest. It has been achieved a lot since its first introduction in 1980 in Japan. SCC virtually replaced the conventional vibrated concrete, and in many countries it started developing the SCC culture of construction technology. Currently, researchers are actively searching for new local secondary raw materials to be used as micro fillers. SCC mechanical and technological properties are being improved by incorporating partially oriented dispersive reinforcement.
In this paper, influence of two waste materials: fly ash and synthetic zeolite, obtained from oil cracking process – on self-compacting fiber reinforced concrete (SCFRC) rheology and mechanical properties are compared while cement is partly replaced (10-30%) by those waste materials. Possibility of replacing the fly ash additive, which is quite widely used in the region, by zeolitic waste, obtained from oil cracking process, is analysed in this paper. Slump flow, t500 slump flow duration, J-ring tests are analysed. In addition, results of cement paste and hardened cement paste comparative research, X-ray analysis, shrinkage strain and mechanical properties are presented.
Studies show that selected additives classified as secondary raw materials have the capacity of modifying mixture plastic viscosity and yield stress values which are extremely significant properties for concrete workability in heavy reinforced structures, as well as for fiber orientation factor.