New Cementitious Materials Based on Alkali-Activated Fly Ash: Performance at High Temperatures
New Cementitious Materials Based on Alkali-Activated Fly Ash: Performance at High Temperatures
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DOI：
10.1111/j.1551-2916.2008.02625.x
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发表时间：
2008-10-01
影响因子：
3.9
通讯作者：
Martin, Antonia
中科院分区：
文献类型：
--
作者：
Fernandez-Jimenez, Ana;Palomo, Angel;Martin, Antonia
本文对比研究了一种工业硅酸盐水泥与一种不含OPC的8M-NaOH活化飞灰制成的新型胶凝材料在不同温度下的力学性能。进行了两种类型的力学试验：(I)高温力学试验，以确定两种材料在25摄氏度到600摄氏度之间的强度和断裂韧性；(Ii)热处理后试验，评估在不同温度(200摄氏度、400摄氏度、600摄氏度、800摄氏度和1000摄氏度)下暴露1h后的剩余强度。在这两种情况下，结果表明，新的胶凝材料在高温下的表现明显好于波特兰水泥对照组。利用差热分析(DTG/TG)、傅立叶变换红外光谱(FTIR)和X射线衍射仪(X-射线衍射仪)分析了高温下材料的矿物学和显微结构的变化。这些试验的结果与所观察到的力学行为相关联。
This paper reports on a comparative study of the mechanical performance at different temperatures of a commercial Portland cement, used as a control, and a new cementitious material made from an 8M-NaOH activated fly ash and containing no OPC. Two types of mechanical tests were conducted: (i) high temperature mechanical tests, to determine the strength and fracture toughness of the two materials between 25 degrees and 600 degrees C, and (ii) post-thermal treatment tests, to evaluate the residual strength after I h of exposure to different temperatures (200 degrees, 400 degrees, 600 degrees, 800 degrees, and 1000 degrees C). In both cases, the results showed that the new cementitious material performed significantly better at high temperatures than the Portland cement control. Differential thermogravimetry (DTG)/TG, Fourier transform infrared (FTIR), and X-ray diffraction analyses were also conducted to analyze the mineralogical and microstructural variations taking place in the material as a result of high temperature exposure. The results of these tests were correlated with the mechanical behaviour observed.