Optimisation and Prediction of Fresh Ultra-High-Performance Concrete Properties Enhanced with Nanosilica

The use of high chemical admixture dosages in ultra-high-performance concrete (UHPC) mixtures to achieve adequate water demand can slow down early cement hydration and prolong the setting time. In this study, effects nanosilica (Ns) with on rheological properties UHPC was investigated. A factorial design approach employed predict optimise Ns content, water-binder ratio (W/B), sand-binder (s/b) obtain best flowability, time, compressive strength. This study represents an attempt modelling eighteen containing various proportions water, cement, sand, powder as a possible property enhancer properties. Response surface analyses revealed significant effect controlling prolonged time improving Based applied criterion conditions, optimisation results indicated two targeting either maximum strength or cost effective materials. 1.12 s/b level 0.8% content suitable fulfil strength, flow, limit values.