聚(ju)氨酯(zhi)墻體外保溫施工(gong)中(zhong)常見(jian)問題的(de)處理:
1、氣孔、氣泡(pao):材(cai)料攪(jiao)(jiao)(jiao)拌(ban)(ban)(ban)(ban)方式(shi)及時(shi)間(jian)掌握(wo)不(bu)好(hao),或是(shi)基(ji)層未處理好(hao),均可使涂(tu)膜產生氣孔或扎泡(pao)。氣孔或氣泡(pao)直(zhi)接破壞涂(tu)膜防水(shui)層的均勻和質地(di),形(xing)成滲漏(lou)水(shui)的薄弱部(bu)位。因此施工(gong)時(shi)應注意:材(cai)料攪(jiao)(jiao)(jiao)拌(ban)(ban)(ban)(ban)應選用(yong)(yong)功率大、轉速不(bu)太高的電動攪(jiao)(jiao)(jiao)拌(ban)(ban)(ban)(ban)器,攪(jiao)(jiao)(jiao)拌(ban)(ban)(ban)(ban)容(rong)器宜(yi)選用(yong)(yong)圓(yuan)桶,以利(li)于(yu)強力攪(jiao)(jiao)(jiao)拌(ban)(ban)(ban)(ban)均勻,且(qie)不(bu)會因轉速太快(kuai)而將空氣卷(juan)入拌(ban)(ban)(ban)(ban)合材(cai)料中,攪(jiao)(jiao)(jiao)拌(ban)(ban)(ban)(ban)時(shi)間(jian)以2~5min為宜;涂(tu)膜防水層一定要(yao)清潔(jie)干(gan)凈,不(bu)得有浮砂和灰(hui)塵,每道涂(tu)層均不(bu)得出現氣孔(kong)或氣泡。
2、起鼓:基層質量,有起皮或開裂,影響粘結;基層不干燥,水分蒸發產生的壓力使涂膜起鼓;在濕度大、且通風的環境施工,涂層表面易有冷凝水,冷凝水受熱汽化可使上層涂膜起鼓。修補方法:先將起鼓部分全部割去,露出基層,排出潮氣,待基層干燥后,先涂底層涂料,再依防水層施工方法逐層涂干,若加抹增強涂布則更佳。修補操作要注意,不要損壞。
3、翹邊:涂膜防水層的端部或細部收頭處出現同基層剝離翹邊部分割去,將基層打毛、處理干凈,再根據基材質選擇與其粘結力強的底層涂料刮基層,然后按增強和增補做法仔細涂刷,zui后按順序分層做好涂膜防水層。
4、破損:涂膜防水層施工后、固化前,未注意保護,被其他工序施工時碰壞、劃傷。對于輕度損傷,可做增強涂刷、增補涂刷;對于破損嚴重者,應將破損部分割除,露出基層并清理干凈,再按施工要求、順序,分層補做防水層,并應加上增強、增補涂刷。