Effect of elevated temperature on alkali-activated geopolymeric binders compared to portland cement-based binders
Effect of elevated temperature on alkali-activated geopolymeric binders compared to portland cement-based binders
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DOI：
10.1016/j.cemconres.2016.09.013
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发表时间：
2016-12-01
影响因子：
11.4
通讯作者：
Allison, P. G.
中科院分区：
文献类型：
--
作者：
Rivera, O. G.;Long, W. R.;Allison, P. G.
本研究的重点是开发热稳定材料的基础上碱活化的矿渣，粉煤灰，偏高岭土相比，波特兰水泥混合物，采用分层的方法来设计材料。在较低的长度尺度下，X射线衍射（XRD）表征了矿物学特征，该矿物学特征与使用热重分析（TGA）确定材料热稳定性的较高长度尺度实验相结合。此外，高能X射线计算机微断层扫描（mu CT）确定了最佳性能的材料配方，在暴露于高温（650摄氏度）时最大限度地减少了热损伤。热负荷从环境温度在60秒内上升到650摄氏度，然后保持总共10分钟。亩CT确定，碱活化粉煤灰砂浆比普通波特兰水泥混合物具有更低的初始孔隙率，直径在20和50 μ m之间的孔隙超过66%。因此，碱活化粉煤灰砂浆能够在仅50 mm的材料中消散约565摄氏度，优于本文研究的所有其他混合物，mu CT证实温度暴露后的损伤最小。(C)2016爱思唯尔有限公司版权所有
This research focused on developing thermally-stable materials based on alkali-activation of slag, fly ash, and metakaolin compared to portland cement mixtures by using a hierarchical approach to material design. At lower length scales, X-ray diffraction (XRD) characterized the mineralogy that coupled to higher length scale experiments using thermogravimetric analysis (TGA) for determining the materials thermal stability. Additionally, high-energy X-ray computed microtomography (mu CT) determined the best-performing material formulation that minimized thermal damage when exposed to high temperatures (650 degrees C). The thermal loading was ramped up to 650 degrees C from ambient temperature in 60 s and then held for a total of 10 min. The mu CT identified that the alkali-activated fly ash mortar had less initial porosity than the ordinary portland cement mixtures, with more than 66% of the pores between 20 and 50 mu m in diameter. Consequently, the alkali-activated fly ash mortar was able to dissipate approximately 565 degrees C in just 50 mm of material, outperforming all the other mixes studied in this paper with mu CT confirming minimal damage after the temperature exposure. (C) 2016 Elsevier Ltd. All rights reserved.