This preliminary experimental study has indicated the feasibility of replacing only the coarser cement particles in a high performance (low w/s) mortar or concrete by an inert filler in order to conserve cement. Although the concept was investigated by Wig [1] almost 100 years ago, few if any direct applications of the concept have been found. While adding limestone to cement to achieve a cost savings is a common practice in many parts of the world, the judicious replacement of coarse cement particles by similarly sized limestone may provide equivalent economic incentives with little or no reduction in long term quality.