Powder type of self-compacting concrete (SCC) needs high cement content to achieve self-compactibility, this will be undesirable in tropical climate Sudan due implication hydration heat. This paper investigates reducing up 340 Kg/m3 by blending limestone powder (LSP) 15 % as replacement weight. Therefore, fifteen mixes having maximum (P) 400 have been carried out with four water/powder ratios (...