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    影响混凝土收缩的主要因素
    来源:http://www.jndmzp.com   时间:2016-2-23 15:20:39
    1、 含水量影响。混凝土在水中会呈现一种膨胀的状态,所以当其表面的含水量较高时会导致表面早期的收缩较大。
    1, water content. The concrete will show a swelling in water, so when the surface of the high moisture content will lead to surface early shrinkage.
    2、 水泥自流平活性影响。颗粒越细则代表水泥的活性越高,接触的表面积增加了,收缩就会变大。一般来说我们选择水泥都是按其构件厚度来选,例如,矿渣水泥收缩比普通水泥收缩大,我们则选后者。
    2, self leveling cement activity. More details on behalf of the activity of cement particles is higher, contact area increases, the contraction will be larger. In general we are selecting cement according to the thickness of the component to the election, for example, slag cement shrinkage is bigger than ordinary cement shrinkage, we choose the latter.
    3、 集料因素影响。骨料的选择、颗粒粒径、含泥量等都是影响混凝土收缩的重要因素。例如,选择砂岩做骨料,收缩幅度会增加;粗细骨料中含泥量越大收缩越大; 骨料粒径越小,砂率越高,收缩越大; 配筋率越大,收缩越小,但配筋率过大则会增加混凝土的拉应力; 外加剂及掺合料选择不当,严重增加收缩。
    3, the aggregate impact factors. Aggregate selection, particle size and mud content are important factors affecting shrinkage of concrete. For example, sandstone aggregate, contraction amplitude will increase; coarse aggregate mud content, the more the amount of shrinkage is bigger; and the smaller the particle size of aggregate, sand rate is high, shrinkage is larger; reinforcement ratio is greater, smaller shrinkage, but reinforcement ratio is too large will increase the concrete tensile stress; admixture and mineral admixture improper selection, serious increase in contraction.
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    The Jinan ground leveling to everybody friendship devotion. More knowledge about please click: http://www.jndmzp.com we will lean the sentiment to answer your questions.

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