Impact of fibre factor and temperature on the mechanical properties of blended fibre-reinforced cementitious composite

Blended fibres are being utilized in ordinary Portland cement-based materials (CBMs). The inclusion of blended fibre (a mix of several fibre types) may help CBMs perform better under fire. Fibre factor (F.F) and mechanical characteristics of blended fibre-reinforced CBMs are investigated in this research under various temperature conditions. In addition to mechanical characteristics, empirical models for strength properties in response to temperature and F.F. are established. The addition of calcite powder to blended fibres in CBMs increased mechanical strength across the board at all temperatures. However, increasing the temperature from 20 degrees C to 750 degrees C resulted in 75%, 79%, and 84% reductions in compression, split tension, and flexure strength of blended fibre-reinforced CBMs, respectively. For compression, split tension, and flexure strength, empirical models with R-2 values of 0.98, 0.92, and 0.93 were constructed, with fibre factor and temperature as the major affecting variables. Experimental data for blended fibre-reinforced CBMs revealed that empirical models predicted superior outcomes, which was brought into existence.

Automated summary

Blended fibres are used in ordinary Portland cement-based materials to improve their performance under fire. The addition of calcite powder increased mechanical strength of the materials, but higher temperatures led to significant reductions in strength. Empirical models were established to predict strength properties, with fibre factor and temperature as major affecting variables, showing superior outcomes.