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首页> 外文会议>Symposium on geopolymer binder systems >Microstructural Changes Responsible for Hardening of Fly Ash-Slag Geopolymers Studied through Infrared Spectroscopy
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Microstructural Changes Responsible for Hardening of Fly Ash-Slag Geopolymers Studied through Infrared Spectroscopy

机译：负责通过红外光谱研究的粉煤灰渣缘聚合物硬化的微观结构变化

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Geopolymers are being studied extensively as a potential replacement for Portland cement. However, very few studies have focused on characterizing the setting and stiffening of geopolymers. The main objective of this research is to relate microstructural changes with the hardening of geopolymers, especially Class F fly ash-slag-based geopolymers. The raw materials were thoroughly mixed with potassium silicate and potassium hydroxide for activation. The hardening rate was studied using the Proctor penetration test (ASTM C430) and the shear wave ultrasonic wave reflection method. The microstructural changes responsible for hardening were studied by characterizing geopolymer solids using Fourier transform infrared spectroscopy (FTIR) and the x-ray diffraction method (XRD). It was observed that XRD could not detect the changes happening with time because the geopolymer product was amorphous. However, FTIR clearly showed a shift in the Si-O-T(T=Al, Si) asymmetric stretching band to lower wavenumbers, indicating the development of a geopolymer product with time. The main drawback of using FTIR was that Si-O-T vibrations from the initial ash, the geopolymer product, and calcium silicate hydrate yield an overlapping spectrum resulting in a broad hump that was difficult to interpret. In order to resolve this, FTIR was performed on the solid residue after selective dissolution of calcium silicate hydrate and geopolymer product by salicylic acid and hydrochloric acid, respectively. This revealed the presence of calcium silicate hydrate in the samples at an early age.
机译：地缘聚合物正在广泛研究，作为波特兰水泥的潜在替代品。然而，很少有研究专注于表征地质聚合物的设置和加强。本研究的主要目的是将微观结构变化与地质聚合物的硬化相关，尤其是F类Fly Ash渣的地质聚合物。将原料与硅酸钾和氢氧化钾彻底混合以进行活化。使用Proctor渗透测试（ASTM C430）和剪切波超声波反射方法研究了硬化速率。研究了使用傅里叶变换红外光谱（FTIR）和X射线衍射法（XRD）表征地质聚合物固体来研究负责硬化的微观结构变化。观察到XRD无法检测到随时间发生的变化，因为地缘聚合物产物是无定形的。然而，FTIR清楚地显示了在Si-O-T（T = Al，Si）不对称伸展带中的转变为下波数，表明随着时间的推移显示地质聚合物产品的发展。使用FTIR的主要缺点是来自初始灰分，地质聚合物产物和硅酸钙水合物的Si-O-T振动产生重叠的光谱，从而难以解释的宽驼峰。为了解决这一点，分别通过水杨酸和盐酸选择性溶解硅酸钙水合物和地质聚合物产物后对固体残留物进行FTIR。这揭示了在早期样品中存在硅酸钙水合物。

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