以地聚合物混凝土为基础的环保耐火混凝土结构:不同加热时间下高温暴露的影响

Siti Nooriza Abd Razak, Nasir Shafiq, Laurent Guillaumat, Syed Ahmad Farhan, Vicky Kumar Lohana
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摘要

人们关注地聚合物混凝土在火灾中的脆弱性。高温条件引发混凝土的物理变化和化学反应,从而逐渐破坏水泥的凝胶结构。因此,破坏导致干燥收缩的趋势增加,骨料颜色的变化和承载能力和耐久性的损失。在本研究中,地聚合物混凝土样品在1000°C的不同加热时间下暴露,以研究其对质量损失,残余强度和微观结构性能的影响。制备了GEO20、GEO40和GEO60三个强度等级的样品。采用了6种加热时间,从30分钟到180分钟不等。总体而言,质量损失小于3%,从低强度混凝土的1.65%到高强混凝土的2.93%。在大多数情况下,随着加热时间的增加,残余强度降低,但在30-60分钟的加热时间内,中、低强度混凝土的残余强度开始增加,此时的火暴露有利于地聚合。显微组织分析表明,在高温条件下,基体具有良好的结构完整性。该研究调查了地聚合物混凝土能够抵抗火灾,必须认真考虑作为普通波特兰水泥基混凝土的替代品,以实现可持续建筑的未来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geopolymer-Concrete-Based Eco-Friendly and Fire-Resistant Concrete Structures: Effect of Exposure to High Temperature at Varying Heating Duration
There are concerns towards the vulnerability of geopolymer concrete towards fire. High-temperature conditions instigate physical alterations and chemical reactions in concrete, which progressively breaks down the gel structure of cement. Consequently, the breakdown leads to an increase in tendency of drying shrinkage, changes to colors of aggregates and losses in load-bearing capacity and durability. In the present study, geopolymer concrete samples were exposed to fire at 1000°C at varying heating duration to investigate the effects on mass loss, residual strength and its microstructure properties. Samples with three grades of strength, GEO20, GEO40 and GEO60, were prepared. Six heating durations ranging from 30 to 180 minutes were adopted. Overall, mass losses were less than 3%, ranging from 1.65% as obtained by the low-strength concrete to 2.93% as obtained by the high-strength concrete. For the most part, as heating duration increased, residual strengths decreased, except for when residual strengths of low and medium-strength concrete initially increased at the heating duration of 30–60 minutes, where the exposure to fire facilitated geopolymerization. Analysis of the microstructure reveals that structural integrity of the matrix at high-temperature conditions is adequate. The study investigated the geopolymer concrete is able to resist the exposure to fire and must be seriously considered as an alternative to ordinary-Portland-cement-based concrete for the future of sustainable construction.
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