Na_2SO_4和NaNO_2对混凝土自收缩的影响 |
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引用本文: | 曲维峰. Na_2SO_4和NaNO_2对混凝土自收缩的影响[J]. 山西建材, 2012, 0(3): 8-11 |
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作者姓名: | 曲维峰 |
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作者单位: | 北京建工集团新型建材有限责任公司,北京101104 |
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摘 要: | 采用传统千分表测试方法,研究了W/C为0.3和0.5的两组基准混凝土的自收缩零点测试点,以及这两种W/C下分别单掺1%Na2SO4、2%Na2SO4、1.5%NaNO2和3%NaNO2的混凝土早期自收缩的规律。结果表明,W/C为0.3的基准混凝土自收缩开始测试点为搅拌加水后13 h,掺入2%Na2SO4混凝土自收缩与基准试件较为相近,掺入1%Na2SO4的混凝土自收缩较基准件显著增大。NaNO2的掺入使得混凝土早期自收缩减小,同时,掺入1.5%NaNO2混凝土的早期自收缩比掺量为3%NaNO2的略大。W/C=0.5的基准混凝土自收缩开始测试时间为搅拌加水后21 h,掺入1.5%和3%NaNO2的混凝土自收缩均比基准试件大。
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关 键 词: | 自收缩零点 自收缩 收缩变化率 无机盐 |
Influence of Na2 SO4 and NaNO2 on Concrete Autogenous Shrinkage |
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Affiliation: | QU Wei - feng (Beijing Construction Group, New- Type Building Material Co. Ltd. , Beijing, 101104, China) |
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Abstract: | Using traditional indicator, the present thesis shnnkage zero concrete whose test points W/C is 0. 3 autogenous shrinkage law at test method of dial studies the autogenous of two set of reference and 0. 5 mid the concrete early phase when the two reference concrete are rr,ixed with 1% Na2SO4, 2% Na2SO4,1.5% NAN02 and! 3% NAN02 respectively. The result shows that autogenous shrinkage starting test point of the reference concrete whose W/C is 0.3 is 13 h after being added with water and stirred;the autogenous shrinkage of concrete mixed with 2% Na2SO4 is more similar with reference test specimen; the autogenous shrinkage of c.oncrete mixed with 1% NaESO4 rises notably compared with reference specimen. Adding of NaNO2 makes concrete autogenous shrinkage at early phase decrease. At the same time, concrete autogenous shrinkage mixed with 1.5% NaNO2 at early phase is a little bigger than that of concrete added with 3% NaNO2. Autogenous shrinkage starting test point of the reference concrete whose W/C is 0. 5 is 21 h after being added water and stirred. Autogenous shrinkage of concrete mixed with 1. 556 and 3% NaNO2 are both bigger than reference specimen. |
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Keywords: | autogenous shrinkage zero point autogenous shrinkage shrinkage rate mineral salt |
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