硅灰提高碱活性矿渣/粉煤灰在高温下的机械强度

IF 3 3区 农林科学 Q2 ECOLOGY
Weidong Dai, Yachao Wang
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引用次数: 0

摘要

通过调节多组分冶金固体废物对地质聚合物进行防火设计,由于其潜在的低碳排放、成本效益和环保作用,越来越受到关注。本文研究了硅灰(SF)对碱活性矿渣/FA(粉煤灰)浆体在高温(150、500、850和1200°C)下的微观结构和力学性能的影响,以阐明SF在建筑火灾期间是否对矿渣/FA的机械强度(矿渣/FA=30:70,wt.%)有积极作用。结果表明,用10wt.%SF(硅灰)代替FA促进了直径为0.2~3μm的孔体积的增加,导致850°C以下的抗压或抗弯强度增加,吸热峰“右移”,断裂面均匀致密。同时,在850°C以上暴露后,产生了葛莱石和拉伯拉陨石。含SF样品的膨胀效应发生在1200°C下,由于由[SiO4]4−和[AlO4]5−组成的无定形地质聚合物链N–a–S–H或N–(Ca)–a–S–H的进一步重组,导致更大的变形。本文探讨了通过调整固体废弃物的配方来提高地质聚合物防火性能的有效途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Silica Fume Enhances the Mechanical Strength of Alkali-Activated Slag/Fly Ash Pastes Subjected to Elevated Temperatures
The fireproof design of geopolymers through adjusting multi-component metallurgical solid wastes has attracted increasing attention, due to their potential low carbon emission, cost effectiveness, and role in environmental conservation. Herein, the effects of silica fume (SF) on the microstructure and mechanical properties of alkali-activated slag/FA (fly ash) pastes subjected to elevated temperatures (150, 500, 850, and 1200 °C) are investigated to clarify whether or not SF has a positive role in the mechanical strength of the slag/FA (slag/FA = 30:70, wt.%) geopolymer during building fires. The results show that the replacement of FA with 10 wt.% SF (silica fume) promotes the increasing pore volume with a diameter of 0.2~3 μm, leading to an increase in the compressive or flexural strength below 850 °C, “right shifts” of the endothermic peak, and uniform and compact fracture surfaces. Meanwhile, gehlenite and labradorite are generated after exposure above 850 °C. The bloating effect of the SF-containing sample occurs at 1200 °C, leading to a greater deformation due to the further restructuring of the amorphous geopolymer chain N–A–S–H or N–(Ca)–A–S–H composed of [SiO4]4− and [AlO4]5−. This paper explores an effective approach to improving geopolymers’ fireproof performance by adjusting the formulation of solid waste.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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