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标题：Thermal durability of OPC pastes admixed with nano iron oxide
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作者：Ahmed A. Amer ; Ahmed A. Amer ; Tarek M. El-Sokkary 等
期刊名称：HBRC Journal
印刷版ISSN：1687-4048
出版年度：2015
卷号：11
期号：2
页码：299-305
DOI：10.1016/j.hbrcj.2014.04.002
语种：English
出版社：Elsevier
摘要：Abstract Nanotechnology helps in producing materials with prospective properties, for each field of science (physics, chemistry, bio-science as well as construction materials). Nanoparticles belong to the materials in the field of civil engineering which have a high surface area to provide high chemical reactivity. Some researchers have employed nanoparticles into cementitious materials based on ordinary Portland cement to modify the properties of this system. They have important advantages for the hydration and microstructure of cement paste to increase the rate of hydration and the amount of formed CSH gel. The aim of this work is to investigate the influence of NF on the fire resistance of OPC pastes. The NF was synthesized by thermal decomposition of basic ferric acetate fired at 275, 600 and 800°C. The crystal size of the prepared NF as previously determined was 14.6, 16.98 and 18.68nm, respectively. OPC admixed with 1wt% NF prepared at 275°C gives the higher fire resistance than those admixed with 2 or 3wt%. It shows the higher bulk density, compressive strength and lower porosity up to 450°C than the blank OPC. As the firing temperature of NF increases the fire resistance diminishes.
关键词：Nano-Ferric oxide; Fire resistance; Bulk density; Total porosity; Compressive strength;