Mechanical properties and durability of ultra-high-performance concrete with calcined diatomaceous earth as cement replacement

Abstract Calcined diatomaceous earth (CDE) with a maximum grain size of 143 ?m was used to partially replace 5 and 10% cement in ultra-high-performance concrete (UHPC) mixtures. The other materials producing the include Ordinary Portland Cement, iron ore powder, river sand sizes 112.5, 231, 766.2 ?m, respectively. Moreover, UHPC specimens designed water–cement ratio 0.2 superplasticizer 1.5% from weight were tested for flow, compressive strength, flexural splitting tensile durability against NaCl Na 2 SO 4 attack, resistance 400, 500, 600°C temperatures. results showed that use CDE able increase NaCl, , as well its high temperatures but reduced mixture flow.