Mechanical behavior of carbonated MgO-based Engineered Cementitious Composite (ECC) after high temperatures exposure

Carbonated MgO-based Engineered Cementitious Composite (ECC) has ultrahigh tensile ductility and tight crack width control behavior. However, the expectation of improved fire-resistant not been confirmed. This study explored alterations to mechanical microstructure characteristics this material after exposure temperatures up 500 °C. Material mass loss, compressive strength, strain capacity, matrix fracture toughness were measured. Scanning electron microscopy, mercury intrusion porosimetry, thermogravimetric analysis, X-ray diffraction used probe degradation cement fibers. The effect elevated temperature on carbonated ECC was further assessed via examination micromechanical behavior fiber-matrix. objective research assess performance exposed fire hazards. found be enhanced when ?100 °C as compared with those at room ?20 Further increase in temperature, however, posed a negative impact composite ultimate ability width. results provide useful database for investigations into safety enhancement.