| 摘要: |
| 采用NaHSO4来活化黄河泥沙，并通过X射线衍射(XRD)、红外光谱(FTIR)和固相核磁共振(MAS NMR)等方法，分析了NaHSO4与黄河泥沙的作用机理.结果表明：在NaHSO4作用下，黄河泥沙与水泥的反应活性明显提高，其28 d抗压强度、可塑性和软化系数随着NaHSO4质量分数的增加而提高；当NaHSO4质量分数为6%时，活化黄河泥沙的活性指数达到064，软化系数为036.FTIR，XRD和MAS NMR的分析结果显示，在NaHSO4作用下，黄河泥沙中长石的Si—O—Al基团键角发生偏移，四面体网络结构聚合度下降而活性增加，从而改善了其工程特性. |
| 关键词: 黄河泥沙 活性指数 固相核磁共振 工程特性 |
| DOI：103969/j.issn1007 9629201702008 |
| 分类号: |
| 基金项目:“十二五”国家科技支撑计划项目(2014BAL03B03) |
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| Modification of the Engineering Properties of Yellow River Sediment by Sodium Bisulfate and Its Mechanism |
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LIU Junxia1, LIU Mingqing1, YANG Yanjuan2, ZHANG Lei3
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1.School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China;2.Henan Building Materials Research and Design Institute Co., Ltd., Zhengzhou 450002, China;3.School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China
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| Abstract: |
| The Yellow River sediment was activated by NaHSO4. The influence of NaHSO4 on the stabilizability, strength, plasticity and its mechanism were analyzed by X ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and magic angle spinning nuclear magnetic resonance(MAS NMR). Experimental results show that the stabilizability of sediment significantly improve in the presence of NaHSO4. Strength, plasticity and softening coefficient of sediment increase with NaHSO4 mass fraction. When mass fraction of NaHSO4 is 6%, pozzolanic activity index(PAI) reaches 064 and softening coefficient is 036. FTIR, XRD and MAS NMR spectrum results indicate that activation of NaHSO4 induces the deflection Si—O—Al bond angle of feldspar and the decrease of polymerization of Si—O tetrahedron network. Engineering properties of Yellow River sediment is improved under the activation of NaHSO4. |
| Key words: Yellow River sediment pozzolanic activity index(PAI) magic angle spinning nuclear magnetic resonance(MAS NMR) engineering property |
