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建筑外墙ca88手机版登录板老化的原因
建筑外墙ca88手机版登录板老化的原因
文章来源:本站原创  作者:网站管理员  浏览:1 更新时间:2020-03-03 14:17:45

 高层建筑在建设中安装的外墙ca88手机版登录板,即可以起到ca88手机版登录隔热的作用又对外墙体是一种保护作用,可以延长外墙体砖类混凝土材料的使用寿命。但随着使用时间的延长外墙体ca88手机版登录材料也会出现老化的现象,造成其老化的原因有哪些呢?下面我们简单的介绍一下,大致分为五个方面。

 
1、热应力。由温差变化导致的热胀冷缩,会引起非结构构造的体积变化,从而使之始终处于一种不稳定状态,因此,热应力是高层建筑外墙外ca88手机版登录层主要破坏力量之一。相对于多层或平房建筑,高层建筑由于外层接受阳光照射更强,热应力更大,变形也更大,因而在ca88手机版登录抗裂构造设计时,选用ca88手机版登录材料应满足柔性渐变的原则,外层材料的变形能力应高于内层材料的变形能力。
 
2、风压。一般来说,正风压产生推力,负风压产生吸力,对高层建筑外ca88手机版登录层均会造成很大的破坏,这就要求外ca88手机版登录层应具备相当的抗风压能力,而且就抗风压而言,要求ca88手机版登录层无空腔,杜绝空气层,从而避免在风压特别是负风压状态下ca88手机版登录层内空气层的体积膨胀而造成对ca88手机版登录层的破坏。
 
3、地震力。地震力会导致高层建筑结构和ca88手机版登录面层的挤压、剪切或扭曲变形,而ca88手机版登录面层刚性越大,承受的地震力就越大,引起的破坏就可能越严重。这就要求高层建筑外墙外ca88手机版登录材料在有相当附着力的前提下,必须满足柔性渐变的原则,以分散和消纳地震应力,尽量减轻ca88手机版登录层表面的荷载,防止在地震力的影响下ca88手机版登录层出现大面积开裂、剥离甚至脱落。
 
4、水或水蒸汽。为避免水或水蒸汽对高层建筑的破坏,应选用憎水性好、水蒸汽渗透性好的外ca88手机版登录材料,避免水或水蒸汽在迁移过程中出现墙体结露或ca88手机版登录层内部含水率增高的现象,提高高层建筑外ca88手机版登录层的耐雨水侵蚀以及抗冻融能力。
 
5、火灾。高层建筑比多层建筑的防火等级要求更高,高层建筑的ca88手机版登录层应具有更好的抗火灾功能,并应具有在火灾情况下防止火灾蔓延和防止释放烟尘或有毒气体的特性,材料强度和体积也不能损失降低过多,面层无爆裂、无塌落,否则,就会给住户或消防人员造成伤害,对施救工作造成巨大的困难。
The external wall thermal insulation board installed in high-rise building can not only play the role of heat preservation and insulation, but also protect the external wall, which can prolong the service life of brick-like concrete materials. But with the extension of the use of external wall insulation materials will appear aging phenomenon, resulting in the aging of the reasons? Here we briefly introduce, roughly divided into five areas. 1. Thermal stress. Thermal stress is one of the main destructive forces of external thermal insulation of high-rise building because of the volume change of non-structure structure structure caused by the change of temperature difference. Compared with multi-storey or single-storey buildings, the outer layer of high-rise buildings is exposed to more sunlight, the thermal stress is bigger, and the deformation is bigger. Therefore, when designing the heat preservation and anti-cracking structure, the selection of heat preservation materials should meet the principle of flexible gradual change, the deformation capacity of the outer material shall be higher than that of the inner material. 2. Wind pressure. Generally speaking, positive wind pressure produces thrust and negative wind pressure produces suction, which will cause great damage to the external insulation layer of high-rise buildings. This requires that the external insulation layer should have considerable wind pressure resistance, and in terms of wind pressure resistance, it is required that the insulation layer has no cavity to avoid the air layer, so as to avoid the damage to the insulation layer caused by the volume expansion of the air layer in the insulation layer under the wind pressure, especially the negative wind pressure. 3. Earthquake Force. The earthquake force will cause the compression, shear or distortion of the high-rise building structure and the insulation surface, and the greater the rigidity of the insulation surface, the greater the earthquake force, and the more serious the damage may be caused. This requires that the exterior wall insulation materials of high-rise buildings must meet the principle of flexible gradual change under the premise of having considerable adhesion, so as to disperse and absorb earthquake stress, and reduce the load on the surface of the insulation layer as much as possible, to prevent large-area cracking, peeling off and even falling off of thermal insulation layer under the influence of earthquake force. 4. Water or steam. In order to avoid the damage of water or steam to the high-rise building, the external insulation material with good hydrophobicity and Water Vapor permeability should be chosen to avoid the phenomenon of wall condensation or high water content in the insulation layer during the transfer of water or water vapor, to improve the external insulation layer of high-rise buildings rain erosion and freeze-thaw resistance. 5. Fire. High-rise buildings are required to have higher fire protection levels than multi-story buildings. The insulation of high-rise buildings should have better fire protection functions, and should have the characteristics of preventing fire spreading and releasing smoke or toxic gases in case of fire, material strength and volume can not be too much loss, no explosion, no collapse, otherwise, it will cause harm to residents or fire personnel, on the rescue work caused great difficulties.
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