Assessment of Relationship Between Temperature and Selected Technical Parameters of High-Strength, Fine-Grained Ordinary and Polypropylene Fibre-Modified Building Mortars Subjected to Conditions Simulating Fire.

In terms of tensile strength under flexural and splitting for both samples with and without polypropylene fibre addition, an increasing trend in this parameter was observed up to 100 °C (from 8.3 MPa to 9.6 MPa without fibres and from 10.6 MPa to 12.5 MPa with fibres), followed by an almost linear decrease down to 600 °C, reaching values of approximately 5.1 MPa (without fibres) and 5.5 MPa (with fibres).

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