Energetically Modified Cement (EMC) consists of a mechanochemical processed blend of ordinary Portland Cement (OPC) and filler or pozzolan. The process is carried out in multiple high intensity grinding mills to increase surface activation of the OPC and filler/pozzolan particles. Performance of EMC with 50% quartz or fly ash is compared with simple blends of same components. Examples are also shown where fly ash of low reactivity can be activated as pozzolan by the same process and used as additive to concrete.