How can we prevent thermal insulation mortar cracking? Shandong thermal insulation mortar related personnel to tell you about this problem.

　　现在我国的北方城市当中，为了让房屋的御寒效果得到提升。很多建筑物都进行了无机保温砂浆的安装，其实建筑的无机保温砂浆就是将绝热材料与建筑物墙体固定在一起，从而达到隔热或者保温的一种措施。但是我们在对建筑进行外墙保温施工的时候有时会出现开裂的现象，这究竟是什么原因呢?

　　Now in the northern cities of our country, in order to improve the cold-proof effect of houses. Many buildings have been installed with inorganic thermal insulation mortar. In fact, the inorganic thermal insulation mortar of buildings is a measure of fixing insulation materials and building walls together to achieve thermal insulation or thermal insulation. But we sometimes crack in the construction of exterior wall insulation. What is the reason?

　　一、不完全外保温引起的裂缝也会使保温砂浆开裂。在外墙保温中，我们经常注重整体墙面的保温，然而却忽略了女儿墙、雨篷、老虎窗、凸窗、外阳台等部位的保温，而使此部分出现开裂或者降低使用寿命。在保温层与其他材料的材质变换处，因为保温层与其他材料的材质的密度相差过大，这就决定了材质间的弹性模量和线性膨胀系数也不相同，在温度应力作用下的变形也不同，极容易在这些部位产生面层的裂缝。同时还应该考虑防水处理，防止水分侵入到保温体系内，避免因冻涨作用而导致体系的破坏，影响体系的正常使用寿命和体系的耐久性。

　　Firstly, cracks caused by incomplete external insulation will also cause cracks in insulation mortar. In the external wall insulation, we often pay attention to the overall wall insulation, but neglect the parapet, canopy, tiger window, convex window, external balcony and other parts of the insulation, which cracks or reduces the service life. In the place where the insulation layer is changed from other materials, because the density difference between the insulation layer and other materials is too large, it determines that the elastic modulus and linear expansion coefficient between materials are also different, and the deformation under the action of temperature stress is also different. It is very easy to produce surface cracks in these parts. At the same time, waterproofing treatment should be considered to prevent water intrusion into the insulation system, avoid the damage of the system caused by frost heave, and affect the normal service life of the system and the durability of the system.

　　二、普通水泥砂浆自身易产生各种收缩变形，并且存在强度增长周期短、体积收缩周期长的矛盾，在约束条件下，当体积收缩形成的拉应力超过水泥砂浆的抗拉强度时，就会出现裂缝。处于保温层保护下的主体结构受温度变形影响较小，而20~30mm的找平砂浆处于热阻很大的聚苯板的外侧，因受环境温度影响而产生较大变形。聚苯板两侧的水泥材质受环境温差影响而产生较大相对变形差，引起开裂。另外由于保温隔热板平整度很难控制，会造成找平抹灰厚度的不均，造成局部收缩和温差应力不均从而引起裂缝。

　　Secondly, ordinary cement mortar itself is prone to produce various shrinkage deformation, and there is a contradiction between short period of strength growth and long period of volume shrinkage. Under restraint conditions, when the tensile stress formed by volume shrinkage exceeds the tensile strength of cement mortar, cracks will appear. The main structure protected by thermal insulation layer is less affected by temperature deformation, while the leveling mortar of 20-30mm is located on the outer side of the polystyrene board with great thermal resistance, which results in large deformation due to the influence of environmental temperature. The cement material on both sides of the polyphenyl board is affected by ambient temperature difference, which results in relatively large deformation difference and cracking. In addition, because the flatness of insulation board is difficult to control, it will cause uneven plastering thickness, local shrinkage and uneven temperature stress, which will lead to cracks.