THE INFLUENCE OF THE SILICA/SODIUM RATIO ON THE FLY ASH GEOPOLYMER BINDER

the Chemical Technology Pub Date : 2017-08-22 DOI:10.5755/J01.CT.68.1.18873

V. Bocullo, D. Vaičiukynienė, V. Vaitkevičius, A. Kantautas

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引用次数: 3

Abstract

This article investigates the properties of a geopolymer, an alternative binding material to the ordinary Portland cement (OPC), and their dependence on different SiO 2 /Na 2 O ratios in the system. To make the geopolymer polish coal burning fly ash consisting mainly of amorphous SiO 2 and Al 2 O 3 , it was activated with a NaOH solution. While many researches have been done on the Si/Al ratio influence, not many studies have examined the activator solution influence on geopolymer properties. Samples were made with 8 different mix compositions with the SiO 2 /Na 2 O ratio varying within 0.8–3.1. The samples were tested for compressive strength after 7, 14 and 28 days of curing. The mineral composition of each set mix was examined with XRD. Samples with the SiO 2 /Na 2 O ratio equal to 2.0 showed the highest compressive strength. The XRD of these samples showed the presence of low-crystallinity hydrosodalite and a small amount of mullite and quartz. The acceptable strength was shown by samples with the SiO 2 /Na 2 O ratio in the range of 1.5–2.5. Samples with the ratio beyond this range failed to produce enough of the necessary binding agents. DOI: http://dx.doi.org/10.5755/j01.ct.68.1.18873

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硅钠比对粉煤灰地聚合物粘结剂性能的影响

本文研究了一种可替代普通硅酸盐水泥(OPC)的结合材料地聚合物的性能，以及它们对体系中不同sio2 / na2o比例的依赖。为制备以无定形sio2和al2o3为主要成分的地聚合物抛光煤飞灰，采用NaOH溶液对其进行活化。虽然对硅铝比影响的研究较多，但考察活化剂溶液对地聚合物性能影响的研究并不多。样品由8种不同的混合成分制成，sio2 / na2o比值在0.8 ~ 3.1之间变化。分别在养护7、14、28天后进行抗压强度测试。用x射线衍射仪(XRD)分析了各混合料的矿物组成。sio2 / na2o比为2.0的试样抗压强度最高。XRD分析表明，样品中含有低结晶度的水钠石，以及少量的莫来石和石英。sio2 / na2o比在1.5 ~ 2.5范围内的试样具有可接受的强度。超过这个比例的样品不能产生足够的必需的结合剂。DOI: http://dx.doi.org/10.5755/j01.ct.68.1.18873

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