NaOH-activated ground fly ash geopolymer cured at ambient temperature
NaOH-activated ground fly ash geopolymer cured at ambient temperature
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DOI：
10.1016/j.fuel.2011.01.018
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发表时间：
2011-06-01
期刊：
影响因子：
7.4
通讯作者：
Chindaprasirt, Prinya
中科院分区：
文献类型：
--
作者：
Somna, Kiatsuda;Jaturapitakkul, Chai;Chindaprasirt, Prinya
本文研究了NaOH活化粉煤灰地聚合物的室温固化性能。研磨粉煤灰（GFA），具有10.5 μ m的中值粒径，被用作源材料。使用浓度为4.5- 16.5M（M）的NaOH作为碱活化剂。采用SEM、EDX、XRD和FTIR等测试手段对试样进行了抗压强度测试和显微结构观察。结果表明，与原始粉煤灰相比，GFA提供了更高强度的地质聚合物浆体。粉煤灰可用作制备在室温下固化的地质聚合物的源材料。NaOH浓度从4.5 M增加到14.0 M增加了GFA地质聚合物浆料的强度。微观结构研究表明，12.0-14.0 M的NaOH浓度产生铝硅酸钠的新结晶产物。当NaOH浓度为9.5-14.0 M时，28天的抗压强度为20.0-23.0 MPa。增加NaOH浓度超过该点导致浆料强度的降低，这是由于铝硅酸盐产物的早期沉淀。(C)2011爱思唯尔有限公司保留所有权利。
NaOH-activated ground fly ash geopolymers, cured at room temperature, were studied in this paper. Ground fly ash (GFA), with a median particle size of 10.5 mu m, was used as source material. NaOH concentrations of 4.5-16.5 M (M) were used as an alkali activator. Compressive strength tests and microstructure observations using SEM, EDX, XRD and FTIR were performed. Results indicated that GFA gave higher strength geopolymer paste compared to original fly ash. Ground fly ash could be used as a source material for making geopolymers cured at room temperature. An increase in NaOH concentration from 4.5 to 14.0 M increased the strength of GFA geopolymer pastes. Microstructure studies indicated that NaOH concentrations of 12.0-14.0 M created new crystalline products of sodium aluminosilicate. The compressive strengths at 28 days of 20.0-23.0 MPa were obtained with the NaOH concentrations of 9.5-14.0 M. Increasing the NaOH concentration beyond this point resulted in a decrease in the strength of the paste due to early precipitation of aluminosilicate products. (C) 2011 Elsevier Ltd. All rights reserved.