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

Wu, Haoliang; Zhang, Duo; Ellis, Brian R.; Li, Victor C.

doi:10.1016/j.cemconcomp.2021.104255

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

Journal Article · Tue Sep 14 00:00:00 EDT 2021 · Cement and Concrete Composites

DOI:https://doi.org/10.1016/j.cemconcomp.2021.104255· OSTI ID:1976932

Wu, Haoliang ^[1];

^[2];

^[2]

University of Michigan, Ann Arbor, MI (United States); Hong Kong University of Science and Technology, Kowloon (China)
University of Michigan, Ann Arbor, MI (United States)

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

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); Chinese Scholarship Council

Grant/Contract Number:: FE0030684

OSTI ID:: 1976932

Journal Information:: Cement and Concrete Composites, Vol. 124, Issue C; ISSN 0958-9465

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Mechanical behavior of carbonated MgO-based Engineered Cementitious Composite (ECC) after high temperatures exposure

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