Influence of blended powders on properties of Ultra-High Strength Fibre Reinforced Self Compacting Concrete subjected to elevated temperatures

Ultra-High Strength Fibre Reinforced Self Compacting Concrete (UHSFRSCC) is in great demand for use construction projects around the globe. Unless fillers are utilized this concrete, its production will come at an excessive environmental cost due to high Carbon footprint of Portland cement. A gap published literature was identified, where quaternary mixes, containing cement with three fillers, incorporating fibres, and achieving ultra strength, were not cited. In study ternary mixes designed produced, satisfying European Guidelines SCC, compressive strengths exceeding 115 MPa. Some had between 125 – 150 MPa, which previously reported literature. The contained Silica Fume (SF), Metakaolin (MK), Limestone powder (LS) as partial replacement quartz (QP) sand replacement. Basalt Fibres added reinforce matrix. Compressive & tensile strength along UPV, sorptivity, absorption SEM Micro-structure features studied ambient temperature after samples exposed either 200 or 300 oC; since behavior HSC elevated always a cause concern. active inert exhibited synergic all conditions. mix containing: 15% SF, 5% MK, 20% LS 34% QP achieved best performance. splitting improve by 10% 17% while sorptivity decline 40% 29% respectively temperature. Residual improved 19% while, residual significantly increases 21% 28% exposure temperatures 200? 300? respectively. Meanwhile, decreases 39% 38% these temperatures. Microstructure properties supported agreed mechanical permeation characteristics results. results contribute development UHSFRSCC hot weather countries.