Materials Science Forum Vol. 1089

Abstract: Recently, sustainable green binders became mandatory for the construction industry. The process of cement production is responsible for a considerable portion of CO₂ causing global warming. Clinker substitution using available by-products is one of the promising strategies to cut down the CO₂ emissions of the cement industry. Yet, it is challenging to limit the emission of CO₂ without negatively affecting the strength and durability of the proposed concrete. One of the proposed green binders is Limestone-Calcined Clay cement (LC3). The newly developed LC3 binder integrates the advantages of incorporating available cement replacement materials - clay and limestone – and attaining adequate mechanical, physical, and durability performance. In this paper, an intensive review of previous research in LC3-based construction materials including nanomodification, fiber reinforcement, and durability enhancement is presented in details, aiming to highlight the points that lack investigation and the recommended future work.

Abstract: The fire resistance performance of intumescent fireproofing materials for steel structure changes with time, as a result of exposure to environmental conditions especially temperature. The objective of this study is to investigate the impact of environmental conditions on fire protection properties (fire performance and char formation) of intumescent coating materials by using accelerated weathering technique. In this study a group of eight steel plates were coated with intumescent fireproofing of the same dry film thickness (DFT), the prepared samples were devided into two supgroups in which every supgroup of four specimens was exposed to ultraviolet radiation (UV) of wavelength (340 nm) for 0, 3, 6 and 9 years. The all intumescent coated samples were exposed to fire resistance tests in accordance with International test standard to evaluate their fire resistance performance. The formed char layers were characterized by using scanning electron microscopy (SEM). The results revealed insignificant change in the fire resistance for the 3 years aged samples. Increasing the accelerating aging over 3 years led to remarkable degradation of fire resistance. The SEM analysis revealed various foaming efficiencies as function of the exposure time.