| 膨胀剂对混凝土变形性能的影响 |
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| 引用本文： | 高培伟,卢小琳,唐明述.膨胀剂对混凝土变形性能的影响[J].南京航空航天大学学报,2006,38(2):251-255. |
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| 作者姓名： | 高培伟 卢小琳 唐明述 |
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| 作者单位： | 1. 南京航空航天大学航空宇航学院,南京,210016
2. 南京工业大学材料学院,南京,210009 |
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| 基金项目： | 中国科学院资助项目;科技部科研项目 |
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| 摘 要： | 膨胀剂在我国被广泛地应用于补偿大体积混凝土收缩。不同品种的膨胀剂对混凝土的补偿收缩效果有所不同。氧化钙类和硫铝酸钙类(AF t)可补偿混凝土的早期收缩,但分别在28和60 d后仍会出现后期收缩现象。水泥品种、养护条件对膨胀剂的膨胀效果有不同的影响。掺氧化镁类膨胀剂的混凝土没有出现后期收缩现象,比较适合水工大体积混凝土。在做好基础混凝土温度控制的同时,选择适宜品种的膨胀剂,可有效地控制混凝土的变形,减少收缩开裂,提高混凝土的结构耐久性能和建筑物的质量。
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| 关 键 词： | 大体积混凝土 膨胀剂 变形 耐久性 |
| 文章编号： | 1005-2615(2006)02-0251-05 |
| 收稿时间： | 2005-07-04 |
| 修稿时间： | 2005-09-05 |
Effects of Different Expansive Agents on Mass Concrete Deformation Property |
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| Gao Peiwei,Lu Xiaolin,Tang Mingshu.Effects of Different Expansive Agents on Mass Concrete Deformation Property[J].Journal of Nanjing University of Aeronautics & Astronautics,2006,38(2):251-255. |
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| Authors: | Gao Peiwei Lu Xiaolin Tang Mingshu |
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| Abstract: | Various expansive agents are developed recently in China to compensate the concrete shrinkage in different mechanisms.The early concrete shrinkage with CaO-type and AFt-type expansive agents may be compensated,but the later shrinkage after 28 and 60 d cannot be compensated.The expansive effects of these agents are different under different cement curing conditions.The later shrinkage does not exist in the hydraulic concrete with the MgO-type expansive agent.With a good control of temperature differences in the concrete near the foundation,expansive agents can reduce shrinkage and cracking in massive concrete constructions,thus improving their durability and quality. |
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| Keywords: | mass concrete expansive agent shrinkage durability |
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