改性纳米SiO_2有机成膜涂层对混凝土抗氯离子渗透性能的影响
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摘要
为了研究改性纳米SiO_2有机成膜涂层对混凝土抗氯离子渗透性能的影响。选择氯化橡胶(CR)、丙烯酸(AA)、醇酸磁漆(AR)三种有机成膜涂料,制备出了6种改性和未改性纳米SiO_2有机成膜复合涂层混凝土,并采用电通量方法对涂层混凝土进行抗氯离子渗透能力测试。试验结果表明:在不同涂层材料中掺入未改性纳米SiO_2的掺量为1%、2%以及改性纳米SiO_2的掺量为2%、3%时,成膜复合涂层混凝土的抗氯离子渗透性能最好,且改性比未改性纳米SiO_2的改善效果要好。接触角测试结果表明:涂层混凝土的抗氯离子渗透能力与涂层的疏水能力之间存在正相关关系,即表面涂层的疏水性能越强,涂层混凝土的抗氯离子渗透性能越好。
In order to study the effect of modified nano-SiO_2 organic film composite coating on the chloride ion penetration resistance of concrete, three kinds of organic film-forming coatings were selected to prepare six modified and unmodified nano-SiO_2 organic film-forming composite coating concretes, and the conductivity of the coated concrete was tested by the electric flux method. The results show that the improvement effect of the coating concrete with different coating type and W/C is different. The lower the W/C of concrete, the better the chloride ion penetration resistance of the coated concrete. The effect of nano-SiO_2 particles on different coatings is different. Different types of film-forming coatings have different optimum nano-SiO_2 content, and the modified SiO_2 has better improvement effect than unmodified SiO_2. The contact angle test shows that there is a positive correlation between the chloride ion penetration resistance of the coated concrete and the hydrophobic ability of the coating.
In order to study the effect of modified nano-SiO_2 organic film composite coating on the chloride ion penetration resistance of concrete, three kinds of organic film-forming coatings were selected to prepare six modified and unmodified nano-SiO_2 organic film-forming composite coating concretes, and the conductivity of the coated concrete was tested by the electric flux method. The results show that the improvement effect of the coating concrete with different coating type and W/C is different. The lower the W/C of concrete, the better the chloride ion penetration resistance of the coated concrete. The effect of nano-SiO_2 particles on different coatings is different. Different types of film-forming coatings have different optimum nano-SiO_2 content, and the modified SiO_2 has better improvement effect than unmodified SiO_2. The contact angle test shows that there is a positive correlation between the chloride ion penetration resistance of the coated concrete and the hydrophobic ability of the coating.
引文
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[2]谷坤鹏,李漠.矿物掺合料与环氧树脂涂层对混凝土抗氯离子侵蚀能力的影响[J].建筑科学,2008(9):45-49.
[3]孙丛涛,康莉萍,赵霞,等.混凝土涂层的抗渗性能[J].硅酸盐通报,2016,35(5):1378-1384.
[4]ALMUSALLAM A A,KHAN F M,DULAIJAN S U,et al.Effectiveness of surface coatings in improving concrete durability[J].Cement and Concrete Composites,2003,25(4):473-481.
[5]ZHANG G,XIE Q,MA C,et al.Permeable epoxy coating with reactive solvent for anticorrosion of concrete[J].Progress in Organic Coatings,2018(117):29-34.
[6]LI G,YANG B,GUO C,et al.Time dependence and service life prediction of chloride resistance of concrete coatings[J].Construction and Building Materials,2015,83:19-25.
[7]翟晓瑜,张秋禹,艾秋实,等.纳米二氧化硅的制备及其在环氧树脂中的应用[J].中国胶粘剂,2009,18(6):62-65.
[8]PALRAJ S,SELVARAJ M,MARUTHAN K,et al.Corrosion and wear resistance behavior of nano-silica epoxy composite coatings[J].Progress in Organic Coatings,2015,81:132-139.
[9]任小明,赵辉,朱妍娇,等.纳米二氧化硅粒子的改性研究[J].湖北大学学报:自然科学版,2016,38(6):522-526.
[10]陈建壮,柏朱安,李果.有机成膜涂层混凝土抗碳化能力改善的定量评价[J].中国公路,2016,61(4):191-196.
[11]WANG S,LI Y,FEI X,et al.Preparation of a durable superhydrophobic membrane by electrospinning poly(vinylidene fluoride)(PVDF)mixed with epoxy-siloxane modified SiO2nanoparticles:A possible route to superhydrophobic surfaces with low water sliding angle and high water contact angle[J].Journal of Colloid and Interface Science,2011,359(2):380-388.
[12]AMMAR S,RAMESH K,VENGADAESVARAN B,et al.Anovel coating material that uses nano-sized SiO2particles to intensify hydrophobicity and corrosion protection properties[J].Electrochimica Acta,2016,220:417-426.
[13]杨丽霞,张三平,林安,等.有机涂层渗水率及金属界面腐蚀的研究进展[J].材料保护,2001(10):28-30+68.