| 自然变负温养护和恒负温养护对混凝土强度的影响 |
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| 引用本文： | 杨英姿,高小建,邓宏卫,巴恒静.自然变负温养护和恒负温养护对混凝土强度的影响[J].低温建筑技术,2009,31(4):1-4. |
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| 作者姓名： | 杨英姿 高小建 邓宏卫 巴恒静 |
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| 作者单位： | 哈尔滨工业大学,土木工程学院,哈尔滨,150001 |
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| 摘 要： | 为了提高高寒地区冬季施工中泵送混凝土的性能，研究两种坍落度、两种防冻剂的混凝土在自然变负温养护和恒负温养护条件下抗压强度发展规律。结果表明：自然变负温养护由于昼夜温差的变化导致掺防冻剂混凝土7d强度均明显高于恒负温7d的强度，高防冻组分的防冻剂能够促进自然变负温养护下混凝土强度持续增长，也抑制了标准养护条件下混凝土后期强度的发展。利用高效减水剂或增加一定的用水量改善混凝土的工作性时，由于凝结时间的延长，负温下混凝土抗压强度会受到明显影响，混凝土内部易冻结损伤。与自然变负温养护条件相比，利用恒负温养护制度检验防冻剂质量时会因防冻剂类型不同造成质量判断上的差异。采用含高减水组分的防冻剂，并延长正温下的养护时间，有利于提高冬季施工中泵送混凝土的性能。
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| 关 键 词： | 混凝土 自然变负温养护 恒负温养护 |
IMPACTS OF OUTDOOR VARIED NEGATIVE TEMPERATURE AND CONSTANT NEGATIVE TEMPERATURE ON COMPRESSIVE STRENGTH OF CONCRETE |
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| YANG Ying-zi,GAO Xiao-jian,DENG Hong-wei,BA Heng-jing.IMPACTS OF OUTDOOR VARIED NEGATIVE TEMPERATURE AND CONSTANT NEGATIVE TEMPERATURE ON COMPRESSIVE STRENGTH OF CONCRETE[J].Low Temperature Architecture Technology,2009,31(4):1-4. |
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| Authors: | YANG Ying-zi GAO Xiao-jian DENG Hong-wei BA Heng-jing |
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| Affiliation: | School of Civil Engineering;Harbin Institute of Technology;Harbin 150001;China |
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| Abstract: | In order to improve the properties of pumping-concrete for winter construction in cold region,the development of compressive strength of concrete was investigated at different slump with two kinds of anti-freezing admixture undergoing two curing conditions,which are outdoor varied negative temperature(OVNT) and constant negative temperature(CNT).The results showed that the compressive strength of concrete with anti-freezing admixture at 7 days under OVNT condition were higher than those under CNT.High anti-... |
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| Keywords: | concrete outdoor varied negative temperature constant negative temperature |
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