本文選題：聚氨酯止水材料 + 渠道伸縮縫��； 參考：《新疆農業(yè)大學》2016年碩士論文

【摘要】：聚氨酯密封膠作為水工伸縮縫止水材料得到廣泛應用。但在特殊環(huán)境和條件下,因施工環(huán)境溫度、伸縮縫界面潮濕或粘有污物等原因往往會降低聚氨酯止水材料的粘結性能。因此,針對聚氨酯止水材料施工中存在的問題,開展了特殊施工環(huán)境下渠道伸縮縫聚氨酯止水材料粘結性能的試驗研究。通過試驗研究得出以下結論:(1)雙組份聚氨酯止水材料的粘結性能,在施工前混合攪拌工序中受攪拌時間和環(huán)境溫度的影響較大。試驗結果發(fā)現:雙組份聚氨酯止水材料的粘結性能隨攪拌時間的延長而提高;環(huán)境溫度越低雙組份聚氨酯止水材料的攪拌難度越大、施工越困難、攪拌均勻程度越差、粘結性能越差。當環(huán)境溫度為15℃~25℃時,充分攪拌時間應≥5min,才能保證雙組份聚氨酯止水材料具有足夠的粘結強度;當環(huán)境溫度為≤2℃時,即使充分攪拌時間達到10 min,也難以保證雙組份聚氨酯止水材料的粘結強度和質量;低溫環(huán)境下采用摻加柴油的方法雖然在一定程度上能夠稀釋雙組份聚氨酯拌合物,便于攪拌、混合均勻,但施工后聚氨酯止水材料的粘結強度會顯著降低。(2)混凝土伸縮縫界面粘有灰塵、干燥泥土、潮濕泥土、油污時會降低聚氨酯材料的粘結強度,降低程度分別為21.71%、16.82%、43.43%、33.15%。對于粘有灰塵界面,采用“涂刷界面劑”、“毛刷處理”、“毛刷處理+界面劑”和“吹風機”四種處理方式可以有效改善界面粘結性能,其中“毛刷處理5遍+界面劑”措施的效果最佳;對于粘有干燥泥土界面,采用“鋼刷+吹風機+界面劑”、“鋼刷+吹風機”兩種方式可以有效改善界面粘結性能。(3)采用“涂刷界面劑”措施對粘有浮塵界面有明顯效果,但對粘有泥土界面無效。(4)粘結界面潮濕會明顯降低聚氨酯材料的粘結強度,降低程度主要取決于界面含水率,含水率越高,降低程度越大。界面含水率在2.074%~4.197%范圍內,聚氨酯材料的粘結強度下降15.32%~28.76%。對于潮濕混凝土伸縮縫界面,施工前,在環(huán)境溫度為≥20℃時采取自然晾曬5 h或對伸縮縫界面噴烤處理20遍可以降低界面含水率,提高聚氨酯材料的粘結強度。(5)養(yǎng)護環(huán)境對聚氨酯材料的粘結性能也產生影響。相同施工情況下,施工后在潮濕養(yǎng)護環(huán)境下的聚氨酯材料粘結性能比干燥養(yǎng)護環(huán)境明顯下降。(6)聚氨酯材料粘結強度隨干燥養(yǎng)護時間的延長而提高。聚氨酯材料在經過不同干燥養(yǎng)護時間后承擔輸水任務,聚氨酯材料的粘結性能會有所下降,下降程度隨干燥養(yǎng)護時間的延長而減小。
[Abstract]:Polyurethane sealant is widely used as hydraulic expansion joint watertight material. However, under special environment and conditions, the adhesive properties of polyurethane watertight materials are often reduced due to the temperature of construction environment, the wet interface of expansion joints or the adhesion of dirt. Therefore, in view of the problems existing in the construction of polyurethane watertight materials, an experimental study was carried out on the adhesive properties of polyurethane watertight materials for channel expansion joints under special construction conditions. The following conclusions are drawn from the experimental study: the bindability of two-component polyurethane watertight materials is greatly affected by mixing time and ambient temperature before construction. The results show that the adhesive property of the two-component polyurethane watertight material increases with the prolongation of stirring time, and the lower the ambient temperature, the greater the mixing difficulty of the two-component polyurethane watertight material, the more difficult the construction is, and the worse the mixing uniformity is. The worse the bond is. When the ambient temperature is 15 鈩，

本文編號：1990337