本文關鍵詞： 超疏水涂層 混凝土 抗凍性 防冰性　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：混凝土是當今使用最廣泛的建筑工程材料之一,由于其多孔特性易吸收水分,在寒冷氣候下導致抗凍耐久性不足發(fā)生凍融破壞或者表面結冰影響交通安全。針對目前常用的抗凍性或除冰手段存在不同程度的缺陷,本文擬引入超疏水涂層,以提高其抗凍性和防冰性。本文通過低成本工藝制備超疏水溶液,并采用一步噴涂法對混凝土表面進行超疏水處理,然后研究超疏水涂層對其抗凍性及防結冰性的影響。首先,通過水解縮合反應得到納米-微米級二氧化硅顆粒,然后利用氟硅烷氟化法獲得超疏水溶液。本文比較不同處理方法的疏水效果,測試了超疏水涂層混凝土的接觸角、吸水率以及浸漬深度等基本性能。通過研究超疏水涂層對混凝土抗凍性的影響,結果表明由于超疏水涂層不能進入其孔內且疏水材料本身耐久性不足,僅靠超疏水涂層不能有效提高抗凍性;另一方面,引氣與超疏水涂層處理相結合能夠改善內部結構同時增強表面疏水性,從而有效提高抗凍性。最后,本文研究了超疏水涂層對混凝土表面結冰性及疏冰性兩方面的影響,結果顯示,具有傾斜角時,水滴可以輕易滾落,超疏水涂層提高了結冰勢壘,涂層延緩了結冰時間,從而減少了結冰量;另外,超疏水涂層有效阻止了混凝土表面孔內結冰現(xiàn)象,有效降低了冰與混凝土表面的粘結強度,從而具有良好的疏冰性。此外,根據混凝土表面的粗糙及多孔結構特點,本文給出了描述混凝土表面粘接強度的經驗公式。
[Abstract]:Concrete is one of the most widely used building engineering materials. Because of its porous characteristics, it is easy to absorb water. Freezing and thawing damage or icing on the surface may affect traffic safety in cold climates. In view of the defects of common freezing resistance or deicing methods at present, superhydrophobic coatings are introduced in this paper. In order to improve its frost resistance and ice resistance, the superhydrophobic treatment of concrete surface was carried out by one-step spraying method. Then the effect of superhydrophobic coating on freezing resistance and ice resistance was studied. First, nano-micron silica particles were obtained by hydrolysis condensation reaction. The hydrophobic effect of different treatment methods was compared and the contact angle of superhydrophobic coated concrete was measured. By studying the effect of superhydrophobic coating on the frost resistance of concrete, the results show that the superhydrophobic coating can not enter its pore and the durability of hydrophobic material itself is insufficient. The superhydrophobic coating alone can not effectively improve the frost resistance. On the other hand, the combination of air entrainment and superhydrophobic coating treatment can improve the internal structure and enhance the surface hydrophobicity, thus effectively improving the frost resistance. The effect of superhydrophobic coating on the ice-forming and ice-repellency of concrete surface is studied in this paper. The results show that the droplets can roll down easily and the superhydrophobic coating increases the ice-forming barrier. The coating delayed the freezing time, thus reducing the amount of icing. In addition, superhydrophobic coating effectively prevents the formation of ice in the pore of concrete surface, effectively reduces the bond strength between ice and concrete surface, thus has a good ice thinning property. According to the characteristics of rough and porous concrete surface, an empirical formula is given to describe the bonding strength of concrete surface.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1474755