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电沉积法修复海工结构混凝土水下裂缝的研究 (李勇)

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电沉积法修复海工结构混凝土水下裂缝研究水利论文.u*hb:d~!Qs

T\(O.M_@XQ3o\ n0【作者】李勇 【导师】胡少伟; 范卫国
;P`)Aq'`"dP0【作者基本信息】南京水利科学研究院,材料学,2007年,硕士水利论文't s;t!D]-`A!_.h

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【中文摘要】 电沉积法修复混凝土裂缝是国际上近年来出现的一项新技术,特别适用于传统的修复技术难以奏效或修复成本过高的混凝土结构。日本、美国学者等已对电沉积法修复陆基混凝土结构裂缝的可行性进行了研究,并对具有干缩裂缝的混凝土结构经电沉积后性能进行了初步试验研究;国内学者对沉积效果的影响因素进行了研究。鉴于目前国内外大都集中在对陆基混凝土裂缝的修复研究,而大量海工结构混凝土裂缝需要修复的现实,本文在前人研究的基础上,对把电沉积法应用于海工结构进行了如下研究工作:1.选取宁波北仑港区的海水作为电解质溶液,并与ZnSO4溶液(研究成果显示沉积效果较好)的沉积效果的差异进行了对比。利用海水作为电解质溶液进行研究,这在国内外尚属首次。2.自行改进了试验装置、设计了部分检测装置,分析确定了效果评定参数。测定电沉积试验后海水、ZnSO4溶液中试件的表面覆盖率、质量增加率、裂缝的愈合率、裂缝的填充深度;分析试件的水渗透系数、试件的孔隙结构的改善情况、电沉积法的脱盐效果及各试件沉积物的化学成分、形貌以及沉积物与沉积面、沉积物与裂缝壁的粘结状况。试验结果表明:海水、ZnSO4溶液作为电解质溶液时,电沉积法能使试件表...更多面状况及微观孔隙结构得以改善,裂缝得以封闭,部分氯离子得以脱出;沉积物较为致密,封闭效果良好。3.分析比较海水与ZnSO4溶液中试件修复效果的差异,可知海水作为电解质溶液时,部分评定指标优于ZnSO4溶液,该方法用于修复海工混凝土水下裂缝可行。总之,本文用海水作为电解质溶液,模拟电沉积法应用于水下海工混凝土结构裂缝的修复,为把电沉积法应用于海工结构混凝土水下裂缝的修复奠定了基础,满足了水下混凝土裂缝修复技术的现实需要,促进了裂缝修复技术的发展。  还原水利论文nK:{B2Z8u\vSoR

(d x iyQ`&H.Zi8t0【英文摘要】 Electrodeposition method for repair of concrete cracks is a new technique appearing in recent years, which is specially used for repair of those concrete structure with cracks while other traditional repair systems are inefficient or very expensive. In Japan and America, researches were primarily investigated on the feasibility of electrodeposition method for repair of concrete cracks on land and partial properties of concrete with shrinkage cracks which have been repaired with this technique. In our country, researchers worked on the parameter effect on electrodeposition properties. However, the actuality was that electrodeposition technique were mostly for repair of concrete cracks on land, but lots of structures concrete cracks under marine environment have to be repaired, this article is on the investigation that electrodeposition method repairs concrete cracks under marine environment based on production of precursors,.1. Seawater from Ning-bo Beilun Port and solution of zinc sulf...更多ate, of which electrodeposition effects were best according previous production, were selected as the solution of electrodeposition for the first time in the world, to find differentials of electrodeposition properties between the two solution.2. Equipment of experiment was improved, setting of measurement were designed, as well as assessable parameters of electrodeposition properties were selected. After electrodeposition, rate of surface coating, rate of gain, rate of crack closure and filling depth of crack of the mortar in seawater and solution of zinc sulfate were evaluated. After that, subjects were studied including infiltrator parameter and microstructure configuration melioration of the mortar, removing from the chlorine ion, chemistry composition and appearance of electrodeposits, adhering intensity between electrodeposits and mortar or concrete surface and the wall of crack. Results show that when seawater and solution of zinc sulfate are used, surface and microstructure configuration of mortar and concrete are improved, and crack are closed, chlorine ions are removed; electrodeposits are compact, electrodeposition effects are excellent through electrodeposition.3.By analyzing differentials of electrodeposition effects of concretes and mortar in seawater and solution of zinc sulfate, it is showed that, electrodeposition is feasible to recover the crack concrete when seawater is used to the solution.In a word, a simulation that seawater is selected as the solution of electrodeposition to recover under seawater concrete structure was presented, which lays a foundation for the application of electrodeposition to recover the crack of under marine environment concrete structure. The results not only suffice the requirement but also make a progress of repairing technology for concrete cracks under marine environment.  还原

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【中文关键词】 电沉积法; 海工结构; 水下裂缝修复; 修复效果评价水利论文urRgl!u
【英文关键词】 Electrodeposition method; marine environment structure; repair of cracks under marine environment; electrodeposition effect evaluation水利论文x8}(X5`]1f

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TAG: 混凝土 李勇 海工 电沉积 裂缝
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