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首页> 外文会议>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：红外光谱研究负责粉煤灰矿渣聚合物硬化的微观结构变化

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摘要

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：地聚合物正在被广泛研究作为波特兰水泥的潜在替代品。但是，很少有研究集中于表征地质聚合物的凝结和硬化。这项研究的主要目的是将微观结构的变化与地质聚合物的硬化相关，尤其是F级粉煤灰渣基地质聚合物。将原料与硅酸钾和氢氧化钾充分混合以进行活化。使用Proctor渗透测试（ASTM C430）和剪切波超声波反射法研究硬化速率。通过使用傅立叶变换红外光谱（FTIR）和X射线衍射法（XRD）表征地质聚合物固体，研究了引起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，因为地质聚合物产品是无定形的。但是，FTIR清楚地显示出Si-O-T（T = Al，Si）不对称拉伸带向较低波数的偏移，表明地质聚合物产品随时间发展。使用FTIR的主要缺点是，来自初始灰分，地质聚合物产品和水合硅酸钙的Si-O-T振动会产生重叠的光谱，从而导致难以解释的宽峰。为了解决该问题，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，对固体残留物进行了FTIR。这表明在早期样品中存在水合硅酸钙。

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  • 来源
    《Geopolymer binder systems》|2012年|21-33|共13页
  • 会议地点 San Diego CA(US)
  • 作者

    Sravanthi Puligilla; Paramita Mondal;

  • 作者单位

    Dept. of Civil and Environmental Engineering, 2145 Newmark Civil Engineering Laboratory, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801-2352, United States of America;

    Dept. of Civil and Environmental Engineering, 2129 Newmark Civil Engineering Laboratory, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801-2352, United States of America;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fly ash-slag geopolymer; hardening; FTIR; UWR; Proctor; C-S-H;

    机译：粉煤灰矿渣地聚合物；硬化; FTIR; UWR;督导; C-S-H;

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