| 天然水硬性石灰在不同碳化条件下的水化反应 |
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| 引用本文： | 徐树强,王乐乐,马清林,王菊琳. 天然水硬性石灰在不同碳化条件下的水化反应[J]. 文物保护与考古科学, 2017, 29(4): 1-8 |
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| 作者姓名： | 徐树强 王乐乐 马清林 王菊琳 |
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| 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,北京 100029;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,北京 100029,中国文化遗产研究院,北京 100029,中国文化遗产研究院,北京 100029,北京化工大学,材料电化学过程与技术北京市重点实验室,北京 100029;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,北京 100029 |
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| 基金项目： | 国家科技支撑计划资助(2013BAK01B00) |
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| 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。
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| 关 键 词： | 天然水硬性石灰 水化反应 碳化反应 热重分析(TG) 红外光谱(IR) |
| 收稿时间： | 2017-03-21 |
| 修稿时间： | 2017-04-10 |
Hydration of natural hydraulic lime pastes under different conditions of carbonation |
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| XU Shuqiang,WANG Lele,MA Qinglin and WANG Julin. Hydration of natural hydraulic lime pastes under different conditions of carbonation[J]. Sciences of Conservation and Archaeology, 2017, 29(4): 1-8 |
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| Authors: | XU Shuqiang WANG Lele MA Qinglin WANG Julin |
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| Affiliation: | Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China;Key Research Base of State Administration of Cultural Heritage for Evaluation of Science and Technology Research in Cultural Relics Protection Field, Beijing University of Chemical Technology, Beijing 100029, China,Chinese Academy of Cultural Heritage, Beijing 100029, China,Chinese Academy of Cultural Heritage, Beijing 100029, China and Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China;Key Research Base of State Administration of Cultural Heritage for Evaluation of Science and Technology Research in Cultural Relics Protection Field, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | In order to study the effect of carbonation conditions on the hydration of natural hydraulic lime (NHL), and to allow people to realize how carbonation conditions influence early strength and curing ages of NHL mortars, samples under different carbonation conditions were prepared to simulate the process. The composition, structure and morphology of samples were analyzed by XRD, IR, TG and SEMEDX at various stages of curing. The results showed that the hydration of NHL forming Ca(OH)2 and calcium silicate hydrate (CSH) proceeded simultaneously with the carbonation of Ca(OH)2 and CSH. Overall, the carbonation rate of Ca(OH)2 was larger than the formation rate of Ca(OH)2 from the hydration reaction. At first CSH transforms from a small, fine needle structure to thick rods as curing age increases; then at a certain age, the crystals became smaller, and eventually disappeared being incorporated into the calcite. It is concluded that carbonation of hydration products promotes the hydration of NHL, a conclusion has never been reported before. |
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| Keywords: | Natural hydraulic lime Hydration Carbonation TG IR |
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