An evaluation of the relationship between fresh properties of self-consolidating concrete incorporating blended palm oil fuel ash and pulverised burnt clay

Although the application of palm oil fuel ash and pulverised burnt clay in selfconsolidating concrete is gaining prominence, their application singly in binary mixes is associated with some setbacks. In this study, a blend of Palm oil fuel ash (POFA) and pulverised burnt clay (PBC) was used as partial replacement of Ordinary Portland cement (OPC) to produce self-consolidating high performance concrete (SCHPC). Fifteen different mixes were prepared with varying percentages of blended POFA/PBC, high range water reducing admixture (HRWR) and water to binder ratio (W/B) ranging from 0.30-0.40. Three key fresh properties were investigated. The filling ability was evaluated based on the slump flow, 500mm slump flow time (T500), inverted slump cone flow spread and time, Orimet flow time and v-funnel flow time. The passing ability was evaluated with respect to J-ring flow and L-box blocking ratio. Furthermore, the segregation resistance was determined based on the sieve segregation index and column segregation factor. A comparative analysis was carried out on the results based on the correlations established among the fresh properties of the respective mixes. The research findings revealed strong correlations between most of the fresh properties of the respective SCHPC