technical and economical approaches in application of micro silica gel and calcium carbonate powder in self-compacting concrete

Effects of two admixtures, calcium carbonate powder (ccp) and micro silica gel (msg) on self-compacting concrete (scc) properties, such as workability, compressive strength, and durability are investigated. results, show that, in some cases, concrete with msg is unable to provide a stable condition, although flowability is higher. experimental results indicate that the effect of ccp on sustainability, strength and durability of mixture is remarkable. combo mix design is introduced to benefit from the positive characteristics of two admixtures. results of decision making method show that this mix can be considered as a proper sample along with the sample containing the optimal dosage of ccp. moreover, this method indicates the optimal dosage of ccp is 31.25%, which leads to the best improvement in characteristics of fresh and hardened concrete. in practical engineering, economic analysis demonstrates that using ccp is more cost effective, because is accessible and inexpensive in iranian market.