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

　　現(xiàn)在我國的北方城市當(dāng)中，為了讓房屋的御寒效果得到提升。很多建筑物都進(jìn)行了無機(jī)保溫砂漿的安裝，其實建筑的無機(jī)保溫砂漿就是將絕熱材料與建筑物墻體固定在一起，從而達(dá)到隔熱或者保溫的一種措施。但是我們在對建筑進(jìn)行外墻保溫施工的時候有時會出現(xiàn)開裂的現(xiàn)象，這究竟是什么原因呢?

　　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、不完全外保溫引起的裂縫也會使保溫砂漿開裂。在外墻保溫中，我們經(jīng)常注重整體墻面的保溫，然而卻忽略了女兒墻、雨篷、老虎窗、凸窗、外陽臺等部位的保溫，而使此部分出現(xiàn)開裂或者降低使用壽命。在保溫層與其他材料的材質(zhì)變換處，因為保溫層與其他材料的材質(zhì)的密度相差過大，這就決定了材質(zhì)間的彈性模量和線性膨脹系數(shù)也不相同，在溫度應(yīng)力作用下的變形也不同，極容易在這些部位產(chǎn)生面層的裂縫。同時還應(yīng)該考慮防水處理，防止水分侵入到保溫體系內(nèi)，避免因凍漲作用而導(dǎo)致體系的破壞，影響體系的正常使用壽命和體系的耐久性。

　　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、普通水泥砂漿自身易產(chǎn)生各種收縮變形，并且存在強(qiáng)度增長周期短、體積收縮周期長的矛盾，在約束條件下，當(dāng)體積收縮形成的拉應(yīng)力超過水泥砂漿的抗拉強(qiáng)度時，就會出現(xiàn)裂縫。處于保溫層保護(hù)下的主體結(jié)構(gòu)受溫度變形影響較小，而20~30mm的找平砂漿處于熱阻很大的聚苯板的外側(cè)，因受環(huán)境溫度影響而產(chǎn)生較大變形。聚苯板兩側(cè)的水泥材質(zhì)受環(huán)境溫差影響而產(chǎn)生較大相對變形差，引起開裂。另外由于保溫隔熱板平整度很難控制，會造成找平抹灰厚度的不均，造成局部收縮和溫差應(yīng)力不均從而引起裂縫。

　　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.