【導(dǎo)讀】墻開裂，有些還會注意到伸縮縫處開裂變形、房屋的沉降、地面的塌陷等等。承認，這些都是裂縫或都存在裂縫。房屋建筑中出現(xiàn)的。裂縫的危害又是如何判定的呢？形成的脆性固體?；炷猎谀Y(jié)硬化過程中，受溫度、濕度條件的變化，材料本身。肉眼觀察不到的水泥與粗細骨料粘結(jié)面之間的微細裂縫。規(guī)則的、不連貫的，但在外力作用下或在溫度、濕度變化的情況下，裂縫開始擴展，并逐漸互相串通，從而形成肉眼可見的裂縫（一般初始值~寬），其它墻體材料的裂縫一般也是同上原理。以抵抗這種變形應(yīng)力而導(dǎo)致開裂，這種開裂可稱為塑性裂縫又稱龜裂；束應(yīng)力超過混凝土的極限拉伸時,就會出現(xiàn)裂縫。

　　

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