CN114988914A - 一种提高跨海桥梁混凝土结构耐久性的方法 - Google Patents
一种提高跨海桥梁混凝土结构耐久性的方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 34
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 9
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- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims abstract description 4
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
- C04B41/4922—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as monomers, i.e. as organosilanes RnSiX4-n, e.g. alkyltrialkoxysilane, dialkyldialkoxysilane
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Abstract
本发明公开了一种提高跨海桥梁混凝土结构耐久性的方法,首先对跨海混凝土结构表面进行清洁处理,然后用清水混凝土进行表层抹面,最后进行硅烷浸渍涂装;其中水泥基材料修复时采用不大于原混凝土结构水灰比的水泥基材料进行修补;其中硅烷浸渍材料修复所使用的硅烷浸渍材料中硅烷含量不小于80%,硅氧烷含量不超过0.3%,氯离子含量不大于0.01%。本申请中采用相同水灰比的水泥基材料对浇筑缺陷部位进行修补,然后采用硅烷浸渍材料进行涂刷,以适用于跨海桥梁混凝土结构在盐侵蚀环境下的抗腐蚀能力;其中提高跨海桥梁混凝土结构耐久性,应保障混凝土结构表面的密实性,防止水进入,提高混凝土的抗渗性。
Description
技术领域
本发明涉及建筑材料技术领域,尤其涉及一种提高跨海桥梁混凝土结构耐久性的方法。
背景技术
从混凝土应用于桥梁工程至今,大量的跨海桥梁混凝土结构由于各种各样的原因而提前失效,达不到预定的服役年限。这其中有的是由于混凝土的抗裂性能不足导致的,有的则是由于使用荷载的不利变化而造成的,但更多的是由于结构的耐久性不足而造成的失效,特别是沿海及近海地区的跨海桥梁,由于海洋环境对混凝土的侵蚀,导致钢筋锈蚀而使结构发生早期损坏,丧失了结构的耐久性能,这已成为实际工程中的重要问题。
尤其是新建的或者是正在使用的跨海桥梁混凝土结构,处于环境恶劣的海洋中,长期受到海水中氯盐、硫酸盐等不利因素的侵蚀,影响了桥梁混凝土结构的安全使用性能,国内外已建成许多跨海公路大桥,大多数设计的使用寿命均为100年,有的甚至更长,例如,诺森伯兰海峡大桥、大贝尔特海峡大桥、本州岛四国连络桥、杭州湾跨海大桥、青岛湾跨海大桥、东海大桥和港珠澳大桥等,因此,如何提高海洋环境下的混凝土耐久性成为跨海大桥桥梁混凝土结构的重要难题。
因此,本发明提供一种提高跨海桥梁混凝土结构耐久性的方法,适用于盐侵蚀环境下跨海桥梁混凝土结构耐久性保障技术提升,保障其使用寿命。
发明内容
本发明的目的是提供一种提高跨海桥梁混凝土结构耐久性的方法,解决在于解决跨海桥梁混凝土结构表面在盐侵蚀环境下的耐腐蚀问题。
为解决上述技术问题,本发明采用如下技术方案:
本发明提供了一种提高跨海桥梁混凝土结构耐久性的方法,首先对跨海混凝土结构表面进行清洁处理,然后用清水混凝土进行表层抹面,最后进行硅烷浸渍涂装;
其中水泥基材料修复时所使用的水泥基材料水灰比不大于原混凝土结构材料的水灰比,对跨海混凝土结构表面存在明显麻面、砂斑缺陷时,采用不大于原混凝土结构水灰比的水泥基材料进行修补,以保证修补材料强度不应低于基体混凝土的强度;
其中硅烷浸渍材料修复所使用的硅烷浸渍材料中硅烷含量(%)不小于80%,硅氧烷含量(%)不超过0.3%,氯离子含量不大于0.01%。
本实施例中,进一步地优化,其中跨海桥梁混凝土结构表面存在为不影响其承载能力的缺陷,其中存在的裂纹不大于0.4mm,限定适用范围。
本实施例中,再进一步地优化,其中对跨海混凝土结构表面进行清洁时,将其表面的碱垢、污物清除干净;若其表面有浮浆皮污染物时,对拟进行浸渍表面采用高压喷水进行清洗;并且水冲洗后,拟浸渍表面应在浸渍前自然干燥。
本实施例中,再进一步地优化,所述高压喷水清洗所用水为淡水。
本实施例中,再进一步地优化,所述跨海桥梁混凝土结构的表面应处于光滑细腻的状态,对于水平面,应从左至右或从右至左一个方向连续喷涂;对于垂直面,应采用连续喷涂技术、自最低处向上进行,达到饱和浸渍,经处理区域应至少有5秒钟的“光面”效果(可保持不少于5秒的表面平整效果)。
本实施例中,再进一步地优化,所述水泥基材料中水泥为与原混凝土结构材料相同种类的水泥,而制混凝土浆液采用的水应为淡水。
本实施例中,再进一步地优化,所述硅烷的浸渍使用方法为使用低压不间断循环泵送设备进行喷涂,分层叠加施涂,每遍的涂刷量烷用量应不小于 200g/m2,每层处理间歇至少15min,涂刷总用量应不小于400g/m2;当浸渍面积小于10m2时,采用辊涂或刷涂。
本实施例中,再进一步地优化,所述硅烷浸渍材料为为异丁基三乙氧基膏体硅烷;
本实施例中,再进一步地优化,所述跨海桥梁混凝土结构的表面在喷涂完硅烷浸渍后,24h内不湿水自然风干,3天完全固化后,从而最大程度提高跨海桥梁混凝土结构耐久性。
本实施例中,再进一步地优化,其中跨海桥梁混凝土结构的表面为新浇筑混凝土或经过水泥基材料处理后的混凝土表面时,其应喷水养护7天后再进行施工。
与现有技术相比,本发明的有益技术效果:本申请中采用相同水灰比的水泥基材料对浇筑缺陷部位进行修补,然后采用硅烷浸渍材料进行涂刷,以适用于跨海桥梁混凝土结构在盐侵蚀环境下的抗腐蚀能力;其中提高跨海桥梁混凝土结构耐久性,应保障混凝土结构表面的密实性,防止水进入,提高混凝土的抗渗性。
具体实施方式
本实施例中公开了一种提高跨海桥梁混凝土结构耐久性的方法,实例为沿海跨海桥梁混凝土结构墩柱结构,首先用清水混凝土进行表层抹面,再进行硅烷浸渍涂装;
本实施例中的硅烷浸渍材料硅烷含量(%)85%,硅氧烷含量(%)0.2%,氯离子含量不大于0.01%。具体步骤如下:
(1)混凝土浇筑完养护7天之后,先对混凝土表面进行清理,清洁混凝土表面,将欲处理的表面的碱垢、污物清除干净。混凝土表面存在明显麻面、砂斑等缺陷,应采用水泥基材料进行修补,修补材料强度不应低于基体混凝土强度,硅烷浸渍宜在修补完成14d后进行;
当存在裂缝时,应当按照混凝土专项修补方案采取针对性处理措施。若表面有浮浆皮污染物,可对拟进行浸渍表面采用高压喷水(淡水)清洗。水冲洗后,拟浸渍表面应在浸渍前自然干燥。
(2)墩身混凝土结构表面的面积较小,不超过10m2,采用辊涂或刷涂,分层叠加施涂,每遍的涂刷量应在200g/m2~300g/m2,每层处理间歇20min,涂刷总用量应不小于400g/m2~400g/m2。采用连续喷涂技术、自最低处向上进行,达到饱和浸渍,经处理区域应至少有5秒钟的“光面”效果。墩柱混凝土表面在喷涂完硅烷浸渍后,24h内不湿水自然风干。
(3)在墩柱施工过程中,根据预留的混凝土试件,采用相同的施工方法,喷涂硅烷浸渍,养护7d后,钻取3cm芯样测试混凝土氯化物吸收量,将芯样放入5mol的NaCI溶液,浸泡24小时后,测试芯样不同高度的氯离子含量,试验结果见表1,涂抹硅烷浸渍的芯样氯离子含量和未涂硅烷的芯样相比,氯离子含量均减少了90%以上。
表1芯样不同高度的氯离子含量(%)
芯样编号 | 0-5mm | 5-10mm | 10-15mm | 15~20mm | 20~30mm |
1 | 0.00128 | 0.00101 | 0.00078 | 0.00074 | 0.00069 |
2 | 0.00112 | 0.00105 | 0.00104 | 0.00092 | 0.00089 |
未涂硅烷 | 0.01342 | 0.01331 | 0.01325 | 0.01267 | 0.01198 |
以上实施例仅是对本发明创造的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (10)
1.一种提高跨海桥梁混凝土结构耐久性的方法,其特征在于:
首先对跨海混凝土结构表面进行清洁处理,然后用清水混凝土进行表层抹面,最后进行硅烷浸渍涂装;
其中水泥基材料修复时所使用的水泥基材料水灰比不大于原混凝土结构材料的水灰比,对跨海混凝土结构表面存在明显麻面、砂斑缺陷时,采用不大于原混凝土结构水灰比的水泥基材料进行修补,以保证修补材料强度不应低于基体混凝土的强度;
其中硅烷浸渍材料修复所使用的硅烷浸渍材料中硅烷含量(%)不小于80%,硅氧烷含量(%)不超过0.3%,氯离子含量不大于0.01%。
2.根据权利要求1所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:其中跨海桥梁混凝土结构表面存在为不影响其承载能力的缺陷,其中存在的裂纹不大于0.4mm。
3.根据权利要求1所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:其中对跨海混凝土结构表面进行清洁时,将其表面的碱垢、污物清除干净;若其表面有浮浆皮污染物时,对拟进行浸渍表面采用高压喷水进行清洗;并且水冲洗后,拟浸渍表面应在浸渍前自然干燥。
4.根据权利要求3所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:所述高压喷水清洗所用水为淡水。
5.根据权利要求1所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:所述跨海桥梁混凝土结构的表面应处于光滑细腻状态,对于水平面,应从左至右或从右至左一个方向连续喷涂;对于垂直面,应采用连续喷涂技术、自最低处向上进行,达到饱和浸渍,经处理区域应至少有5秒钟的“光面”效果。
6.根据权利要求5所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:所述水泥基材料中水泥为与原混凝土结构材料相同种类的水泥,而制混凝土浆液采用的水应为淡水。
7.根据权利要求1所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:所述硅烷的浸渍使用方法为使用低压不间断循环泵送设备进行喷涂,分层叠加施涂,每遍的涂刷量烷用量应不小于200g/m2,每层处理间歇至少15min,涂刷总用量应不小于400g/m2;当浸渍面积小于10m2时,采用辊涂或刷涂。
8.根据权利要求7所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:所述硅烷浸渍材料为为异丁基三乙氧基膏体硅烷。
9.根据权利要求8所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:所述跨海桥梁混凝土结构的表面在喷涂完硅烷浸渍后,24h内不湿水自然风干,3天完全固化后,从而最大程度提高跨海桥梁混凝土结构耐久性。
10.根据权利要求1-9任一项所述的提高跨海桥梁混凝土结构耐久性的方法,其特征在于:其中跨海桥梁混凝土结构的表面为新浇筑混凝土或经过水泥基材料处理后的混凝土表面时,其应喷水养护7天后再进行施工。
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