CN105602442B - 一种混凝土构件抗盐冻与阻锈涂料 - Google Patents
一种混凝土构件抗盐冻与阻锈涂料 Download PDFInfo
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Abstract
本发明属于混凝土构件防护材料技术领域,特别涉及一种混凝土构件抗盐冻与阻锈涂料。按重量份数计,将10~25份液体硅烷,4~8份异丁基硅烷、辛基硅烷或异辛基硅烷,1~2份螯合剂,1~2份三乙醇胺,0.2~0.6份聚氧乙烯基醚类非离子型表面活性剂,0.3~2份硼酸混合均匀,配制成涂料原液;将涂料原液与溶剂按照重量比为1:(1~10)的比例进行稀释后使用。本发明的混凝土构件抗盐冻与阻锈涂料具有渗透作用,憎水抗渗性能优越,具有钢筋阻锈功能和提高混凝土构件抗盐冻的能力。
Description
技术领域
本发明属于混凝土构件防护材料技术领域,特别涉及一种混凝土构件抗盐冻与阻锈涂料。
背景技术
公路的桥梁护栏、隧道内的人行道、边坡挡墙等均为混凝土构件。在北方冬季下雪后,为了尽早开放交通,通常需要在公路路面撒除冰盐。融化的含盐雪水溅到公路两侧的混凝土构件上,如果这些构件的抗盐冻性能不好,则将很快损坏。混凝土构件遭受除冰盐的表面侵蚀后,除冰盐所含氯化物侵入混凝土内部,导致内部的钢筋加速锈蚀。目前的公路结构设计时,对于桥梁护栏、边坡挡墙等不承受荷载的混凝土构件的强度等级要求很低,对于耐久性基本没有考虑,所以北方寒冷地区的公路,其混凝土护栏和挡墙等附属设施损坏很快,公路开通投入运营后两三年,就需要进行维修。其主要原因就是这些构件未采取任何防护措施,其抗盐冻性能与防止钢筋生锈的性能太差。
大量的研究结果显示,单纯提高混凝土的强度并不能有效改善混凝土构件的抗盐冻性能与阻锈性能;而且高强混凝土成本高,配制难度大,不是一个可行的技术路线。增加混凝土内的含气量可改善混凝土的抗盐冻性能,但是优质的引气剂不易获得,施工时的质量难于控制,实施难度较大。申请号为200810064004.0的专利公开了一种用于路桥混凝土路面抗盐冻剥蚀的复合外加剂,在混凝土中掺加这种外加剂,可提高混凝土路面的抗盐冻剥蚀性。但这需要在混凝土配制时加入,且掺加量较大,成本提高较多,将其用于混凝土护栏和挡墙等附属设施的可行性很小。
混凝土遭受盐冻破坏,是因为过冷的含盐雪水渗入混凝土内部,产生很大的温度梯度,导致混凝土表面剥蚀。在混凝土构件表面涂刷憎水性的涂层,避免含盐雪水渗入混凝土内部,是提高混凝土构件抗盐冻性能的有效方法。这种方法施工容易,效果显著,成本较低,是价性比最高的防护措施。在混凝土构件表面涂刷迁移型的有机阻锈剂,使有效组分渗入混凝土内部,集聚在钢筋表面,改变其电化学性质,防止钢筋锈蚀。
在《公路工程混凝土结构防腐技术规范》(JTG/T B07-01-2006)中提出,作为公路混凝土构件的附加防腐蚀措施,可在构件表面涂覆憎水性的硅烷基材料。一些混凝土表面防水材料被研发出来,如申请号为201410428464.2的专利公开了一种混凝土表面渗透型防水胶及其制备方法,此为苯丙乳液和硅烷氧烷乳液为主的混凝土表面渗透型防水胶,这种防水剂主要用于防止房建结构的渗漏。申请号为201410834594.6的专利公开了一种新型高渗透混凝土防水剂的制备方法,这是一种以聚氧乙烯基醚类非离子型氟碳表面活性剂为主的混凝土表面防水剂,用于建筑结构防水施工。申请号为201310211377.7的专利公开了一种硅烷水泥混凝土防腐防水剂及其制备方法,涉及一种小分子的烷基乙氧基硅烷和大分子的含氢硅氧烷复合制成的,具有一定交联反应特性的防水剂,用于混凝土结构的防水防腐。申请号为201510305745.3的专利公开了一种混凝土硅烷膏体浸渍防水剂的制备方法,涉及附着力强的混凝土防水剂。这些防水剂或防水防腐剂都是为了提高混凝土的防水性能,不涉及混凝土构件的抗盐冻性能和钢筋的防锈蚀性能。
发明内容
针对现有技术不足,本发明提供了一种混凝土构件抗盐冻与阻锈涂料。
一种混凝土构件抗盐冻与阻锈涂料:涂料原液,按重量份数计,含有10~25份液体硅烷,4~8份异丁基硅烷、辛基硅烷或异辛基硅烷,1~2份螯合剂,1~2份三乙醇胺,0.2~0.6份聚氧乙烯基醚类非离子型表面活性剂,0.3~2份硼酸。
所述硅烷为甲硅烷、乙硅烷、丙硅烷、四硅烷、五硅烷或六硅烷。
所述螯合剂为氨基羧酸盐、有机磷酸盐、氨基羧酸或醇胺类。如氨三乙酸钠、乙二胺四乙酸钠盐、二乙烯三胺五羧酸钠盐、二乙烯三胺五甲叉膦酸钠盐、二乙烯三胺、乙二胺四乙酸、三乙烯四胺等。
所述聚氧乙烯基醚类非离子型表面活性剂优选为脂肪醇聚氧乙烯醚、脂肪酸甲酯聚氧乙烯醚、壬基酚聚氧乙烯醚或辛基酚聚氧乙烯醚。如脂肪醇聚氧乙烯醚AEO-3、脂肪醇聚氧乙烯醚AEO-5、C12-C14仲醇结构的脂肪醇聚氧乙烯醚S-90、脂肪酸甲酯聚氧乙烯醚FMEE、壬基酚聚氧乙烯醚TX-5、壬基酚聚氧乙烯醚TX-7等。
按涂料原液与溶剂的重量比为1:(1~10)的比例加入溶剂进行稀释后使用;所述溶剂为芳香烃类、脂环烃类或醇类溶剂。
所述芳香烃类溶剂优选为苯、甲苯、乙苯、丙苯或邻二甲苯;所述脂环烃类溶剂优选为环己烷、环己酮或甲苯环己酮;所述醇类溶剂优选为甲醇、乙醇、异丙醇、正丁醇、乙二醇或正己醇。
上述一种混凝土构件抗盐冻与阻锈涂料的制备方法:按重量份数计,将10~25份液体硅烷、4~8份异丁基硅烷、辛基硅烷或异辛基硅烷、1~2份螯合剂、1~2份三乙醇胺、0.2~0.6份聚氧乙烯基醚类非离子型表面活性剂、0.3~2份硼酸混合均匀,配制成涂料原液。
本发明的有益效果为:本发明的混凝土构件抗盐冻与阻锈涂料具有渗透作用,憎水抗渗性能优越,具有钢筋阻锈功能和提高混凝土构件抗盐冻的能力。
附图说明
图1为实施例1中未涂刷涂料的混凝土试件经4次冻融循环后的表面状态;
图2为实施例1中涂刷涂料的混凝土试件经过36次冻融循环后的表面状态;
图3为未涂刷涂料的混凝土挡墙经过一个冬季的冻融循环后的表面状态;
图4为涂刷实施例3所述涂料的混凝土挡墙经过一个冬季的冻融循环后的表面状态。
具体实施方式
下面结合具体实施方式对本发明做进一步说明。应该强调的是,下述说明仅仅是示例性的,而不是为了限制本发明的范围及其应用。
实施例1
将10份液体乙硅烷、4份异丁基硅烷、1份二乙烯三胺、1份三乙醇胺、0.3份脂肪醇聚氧乙烯醚AEO-5、0.6份硼酸混合均匀,缓慢搅拌5min,加入100份正丁醇溶剂进行稀释,得到抗盐冻与阻锈涂料。
将该种涂料涂刷在C30混凝土表面,形成憎水薄膜,按照《普通混凝土长期性能和耐久性能试验方法标准》(GB50082-2008)规定的混凝土单面冻融法测定混凝土试件的抗盐冻能力。如图1-图2所示,如果不涂刷涂料,经过4次冻融循环后,混凝土试件表面剥落量达到2856g/m2,远高于标准规定的限值。涂刷涂料的混凝土试件,经过36次冻融循环后,表面剥落量仅为283g/m2,低于标准规定的限值。
将涂刷涂料的混凝土试件浸泡在1%NaCl溶液中28天,其中的钢筋的腐蚀极化电流维持在0.02μA/cm2以下,钢筋处于无锈蚀状态。未涂刷涂料的混凝土试件在同样条件下,其中的钢筋的腐蚀极化电流在1μA/cm2以上,钢筋处于锈蚀状态。实施例2
将25份液体甲硅烷、8份异辛基硅烷、2份乙二胺四乙酸、2份三乙醇胺、0.6份脂肪酸甲酯聚氧乙烯醚FMEE、2份硼酸混合均匀,缓慢搅拌5min,加入100份丙苯溶剂进行稀释,得到抗盐冻与阻锈涂料。
将该种涂料涂刷在C50混凝土表面,形成憎水薄膜,按照《普通混凝土长期性能和耐久性能试验方法标准》(GB50082-2008)规定的混凝土单面冻融法测定混凝土试件的抗盐冻能力。如果不涂刷涂料,经过8次冻融循环后,混凝土试件表面剥落量达到2750g/m2,远高于标准规定的限值。涂刷涂料的混凝土试件,经过48次冻融循环后,表面剥落量仅为220g/m2,低于标准规定的限值。
将涂刷涂料的混凝土试件浸泡在1%NaCl溶液中28天,其中的钢筋的腐蚀极化电流维持在0.03μA/cm2以下,钢筋处于无锈蚀状态。未涂刷涂料的混凝土试件在同样条件下,其中的钢筋的腐蚀极化电流在1μA/cm2以上,钢筋处于锈蚀状态。实施例3
将15份液体丙硅烷、4份异辛基硅烷、1份三乙烯四胺、1份三乙醇胺、0.2份壬基酚聚氧乙烯醚TX-7、0.3份硼酸混合均匀,缓慢搅拌5min,加入100份环己酮溶剂进行稀释,得到抗盐冻与阻锈涂料。
将该种涂料涂刷在与实施例1不同的配合比的C30混凝土表面,形成憎水薄膜,按照《普通混凝土长期性能和耐久性能试验方法标准》(GB50082-2008)规定的混凝土单面冻融法测定混凝土试件的抗盐冻能力。如果不涂刷涂料,经过4次冻融循环后,混凝土试件表面剥落量达到2681g/m2,远高于标准规定的限值。涂刷涂料的混凝土试件,经过36次冻融循环后,表面剥落量仅为255g/m2,低于标准规定的限值。
将涂刷涂料的混凝土试件浸泡在1%NaCl溶液中28天,其中的钢筋的腐蚀极化电流维持在0.02μA/cm2以下,钢筋处于无锈蚀状态。未涂刷涂料的混凝土试件在同样条件下,其中的钢筋的腐蚀极化电流在1μA/cm2以上,钢筋处于锈蚀状态。实施例4
施工方式:
1.混凝土浇筑两周,最好四周后开始施工,保证其充分水化硬化。
2.用钢丝刷,打磨机或5%的盐酸溶液清洗除去混凝土基层表面的浮浆、浮灰、油垢和污渍等。在涂刷涂料前混凝土表面应干燥。
3.使用低压无气喷枪、滚筒或刷子等进行施工。如使用刷子或滚筒施工,应当重复涂抹,保持表面润湿几分钟;如使用低压无气喷枪,应持续喷涂直至基底彻底渗透为止,然后用滚筒滚涂,使涂层均匀。对立面进行作业时,应当从下往上喷涂,使垂流长度达15~20cm。应在第一层涂层仍然湿润时进行第二层喷涂。稀释后的涂料用量不少于300g/m2。
4.在涂层完全干燥前,避免接触水分。
如图3-图4所示,实际施工的桥梁混凝土护栏在经过一个冬季的冻融循环作用后,未涂刷涂料的混凝土护栏表面已有破损,但涂刷实施例3所述涂料的混凝土护栏表面完好无损。
Claims (5)
1.一种混凝土构件抗盐冻与阻锈涂料,其特征在于,涂料原液,按重量份数计,含有10~25份液体硅烷,4~8份异丁基硅烷、辛基硅烷或异辛基硅烷,1~2份螯合剂,1~2份三乙醇胺,0.2~0.6份聚氧乙烯基醚类非离子型表面活性剂,0.3~2份硼酸;
所述液体硅烷为甲硅烷、乙硅烷、丙硅烷、四硅烷、五硅烷或六硅烷。
2.根据权利要求1所述一种混凝土构件抗盐冻与阻锈涂料,其特征在于,所述螯合剂为氨基羧酸盐、有机磷酸盐、氨基羧酸或醇胺类。
3.根据权利要求1所述一种混凝土构件抗盐冻与阻锈涂料,其特征在于,所述聚氧乙烯基醚类非离子型表面活性剂为脂肪醇聚氧乙烯醚、脂肪酸甲酯聚氧乙烯醚、壬基酚聚氧乙烯醚或辛基酚聚氧乙烯醚。
4.根据权利要求1所述一种混凝土构件抗盐冻与阻锈涂料,其特征在于,按涂料原液与溶剂的重量比为1:(1~10)的比例加入溶剂进行稀释后使用;所述溶剂为芳香烃类、脂环烃类或醇类溶剂。
5.根据权利要求4所述一种混凝土构件抗盐冻与阻锈涂料,其特征在于,所述芳香烃类溶剂为苯、甲苯、乙苯、丙苯或邻二甲苯;所述脂环烃类溶剂为环己烷、环己酮或甲苯环己酮;所述醇类溶剂为甲醇、乙醇、异丙醇、正丁醇、乙二醇或正己醇。
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