Behavior of cement-based coating mortars under fire or high temperatures: A systematic literature review

Abstract

Coating mortars are essential for passive fire protection (PFP) in structures, preventing spalling. The present study explored the factors that affect the performance of mortars under fire or high temperatures through a systematic literature review. We used the Scopus database, and surveyed articles published in the past 15 years (2008–2023) resulting in 102 papers that were read completely. Most works investigated the effects of carbon nanotubes (CNTs), supplementary cementitious materials (SCMs), fibers, and phase change materials (PCMs) on the residual mechanical properties of mortars after elevated temperatures. We summarized the influence of these materials, with most results indicating that they are promising strategies to improve the fire resistance of mortars. More specifically for coating mortars, few studies have been conducted on their physical and mechanical characterization, with gaps being observed primarily in terms of thermal characterization and performance with a curing age greater than 90 days. Thus, this research contributes to the advancement of more reliable and efficient construction materials, while ensuring the safety of buildings and people.