天然水硬性石灰在不同碳化条件下的水化反应

发布时间：2018-05-07 01:08

  本文选题：天然水硬性石灰 + 水化反应　； 参考：《文物保护与考古科学》2017年04期

【摘要】：为了探究不同碳化条件对天然水硬性石灰水化过程的影响,继而认识到养护条件中的碳化作用对天然水硬性石灰早期强度和养护时间的影响,模拟制备了不同碳化条件下的样品,用X射线衍射(XRD)、热重分析(TG)、红外光谱(IR)、扫描电子显微镜和X-射线能谱分析(SEM-EDX)测试和比较养护前后天然水硬性石灰成分、结构、形貌的变化。研究表明,天然水硬性石灰水化生成水化硅酸钙(CSH)、氢氧化钙(Ca(OH)_2)的反应与CSH、Ca(OH)_2的碳化反应同时进行,并且Ca(OH)_2的碳化速率大于水化反应生成Ca(OH)_2的速率。随着养护龄期增加CSH逐渐由细小的针棒状结构生长为粗大的棒状结构,随后又逐渐变短并最终完全碳化为方解石晶型的碳酸钙(CaCO_3)形貌。天然水硬性石灰水化产物的碳化作用能促进其水化反应进程。
[Abstract]:In order to explore the effects of different carbonation conditions on the hydration process of natural hydrated lime, and then to recognize the effect of carbonation in curing conditions on the early strength and curing time of natural hydrated lime, Samples were prepared under different carbonization conditions. The changes of composition, structure and morphology of natural hydrated lime before and after curing were measured and compared by X-ray diffraction (XRD), thermogravimetric analysis (TGN), infrared spectroscopy (IR), scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). The results show that the reaction of natural hydrated calcium silicate and calcium hydroxide CaOH-2) is carried out simultaneously with the carbonization reaction of CSH and CaOHJ, and the carbonation rate of Ca(OH)_2 is higher than that of hydration to form Ca(OH)_2. With the increase of curing age, CSH gradually grew from fine needle rod structure to coarse rod structure, then gradually shortened and finally completely carbonized into calcite crystal form of calcium carbonate CaCO3) morphology. The carbonation of natural hydrated limestone can promote its hydration process.
【作者单位】： 北京化工大学材料电化学过程与技术北京市重点实验室;文物保护领域科技评价国家文物局重点科研基地(北京化工大学);中国文化遗产研究院;
【基金】：国家科技支撑计划资助(2013BAK01B00)
【分类号】：TB321
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本文编号：1854714