Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 288, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.123090
Keywords
Engineered cementitious composites; Ultra-high ductility; Fire-resistive coating; Bond strength; Cohesion; Cyclic loading
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The research aims to develop a lightweight fire-resistive engineered cementitious composite (FR-ECC) with improved bonding strength and integrity compared to conventional cementitious fire-resistive material, to effectively protect steel structures from fire damage.
Fireproof coatings are essential for the fire safety of steel structures. A major disadvantage of conventional cementitious fire-resistive material (CFRM) is the susceptibility to crack or delamination from the steel substrate under the combination of fire and loading due to its brittleness. Unlike brittle CFRM, ultra-high ductility engineered cementitious composites (ECC) holds promise to increase the cohesion between coating and steel substrate. The objective of this research is to develop a lightweight ECC as a novel and resilient fire-resistive engineered cementitious composites (FR-ECC). The tensile and compressive properties, dry density, bonding strength, and thermal conductivity of FR-ECC were systematically investigated. The cohesive performance between FR-ECC and steel substrate was determined by reversed flexural tests. The FR-ECC specimens exhibit robust strain-hardening performance in tension as well as large deformation capacity in compression due to the fiber-bridging effect. FR-ECC demonstrates lower bond strength but superior integrity with steel substrate compared to those of CFRM. The successful development of FR-ECC lays the groundwork for its future application in protecting the steel structures under fire. (c) 2021 Elsevier Ltd. All rights reserved.
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