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如何避免外保温裂缝?
作者:admin 来源:本站 发布时间:2017-05-04 17:54:19 浏览次数:393
由于外保温墙面处于大气环境之中,不断受温度、湿度、太阳辐射、风等多种气候因素变化的影响,容易产生裂缝。以往开始研究试验的一些外墙体保温材料,施工后不 久墙面就往往产生开裂现象,而且时间越长,裂缝愈来愈多,缝隙愈来愈宽。要推广外保温墙体,裂缝问题非解决不可。
As the external insulation wall in the atmospheric environment, and constantly by the temperature, humidity, solar radiation, wind and other climatic factors, prone to cracks. In the past, some of the external wall insulation materials began to study, the construction of the wall will often produce cracking phenomenon, and the longer the cracks are more and more wide gap. To promote external insulation wall, crack problem is not solved.

造成外保温墙面裂缝的因素错综复杂,想要避免墙面裂缝,必须有一整套技术措施并且认真执行,有人以为,为了避免裂缝,何必不把面层做得结实一些。面层抹得很厚,用上高标号水泥,高强度砂浆,这就错了。这样做,恰恰更容易开裂。因为面层抗裂的收缩越大,就更容易开裂。因此厚度过大的面层、强度过高的砂浆都是不适当的。在抹面层施工时,为了做到表面光滑,工人往往用铁抹子来回抹压,并拍打表面,把水泥浆液拍到表面上来,以便于压实抹光。但这正是造成裂缝的一个重要因素。 因为这样做的结果,面层砂浆的配合比起了变化,即水泥含量多了,砂子含量少了,因而面层抗拉强度了,也就更容易开裂。因此一些发达国家外保温面层抹平,由于木抹子搓压而上有各种条纹,可以根据需要选用,以便抹出不同的饰面图案来。这样做,就不致造成表面与里层砂 浆配合比不一致,表面水泥浆太多,易于开裂的问题。

山东挤塑板

Causes of cracks in the insulation wall perplexing, want to avoid the wall cracks, and a set of technical measures must be carried out seriously, some people think that, in order to avoid cracks, why not do the surface stronger. The surface layer is very thick, with high grade cement, high strength mortar, this is wrong. To do so, it is more prone to cracking. Because the surface of the greater shrinkage of crack resistance, it is easier to crack. As a result, the thickness of the surface layer, high strength mortar are inappropriate. In plaster layer construction, in order to achieve smooth surface, workers often use iron float shall wipe back and forth, and beat the surface of the cement slurry to shoot up to the surface, in order to wipe compaction. But this is an important factor causing cracks. As a result of this, the surface layer of mortar than with the change, that is, more cement content, sand content is less, so the surface tensile strength, it is more likely to crack. Therefore, some developed countries outside the thermal insulation layer flat, because wood trowel rubbing pressure and there are various stripes, can choose according to need, so as to wipe out different decorative patterns. In this way, it will not cause the surface and inner layer mortar mixture ratio is inconsistent, the surface of cement slurry is too much, easy to crack problem.
为了抵抗表面拉力,在面层砂浆中要埋入玻璃纤维网布。这里又有一些误区。如有人使用普通玻璃纤维网布,似乎没有什么问题,其实也是不行的。因为普通玻璃纤 维是不耐碱的,在碱与水的作用下,网布会逐渐腐蚀掉。而在面层砂浆的水泥里,含有碱性材料,因此,埋入普通玻璃纤维网布,起不了什么作用。必须用浸有耐碱 保护层的网布。
In order to resist the surface tension, the glass fiber mesh should be embedded in the mortar. Here are some mistakes. If someone uses ordinary fiberglass mesh, it seems that there is no problem, in fact, is not enough. Because ordinary glass fiber is not alkali resistant, in the role of alkali and water, the network will gradually erode. In the surface layer of cement mortar, containing alkaline materials, therefore, embedded in ordinary glass fiber mesh cloth, can not play any role. Must be impregnated with alkali resistant protective layer of mesh cloth.
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