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钢纤维增强混凝土的腐蚀及防护研究
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摘要
混凝土是当代应用广泛的建筑材料,但是随着混凝土强度的不断提高,其韧性变得较差。而纤维混凝土复合材料可以改善混凝土材料的强度、韧性和抗裂性等性能,其中钢纤维混凝土有着较其它合成纤维混凝土优良的承载能力,是良好的承重结构材料,在建筑、交通、水利等方面发展很快。但在恶劣海洋环境中钢纤维混凝土也会发生锈蚀,从而影响结构的使用性能。
     本论文针对钢纤维混凝土的腐蚀问题,完成了以下工作:对钢纤维混凝土的增强机理和腐蚀机理进行了研究,重点研究了海水腐蚀对钢纤维混凝土界面性能和力学性能的影响;提出了采用磷酸锌化学处理法对钢纤维改性的腐蚀防护措施;研究了磷酸锌改性钢纤维混凝土在海水腐蚀环境中的工作性能;提出了钢纤维混凝土强度普适计算模式。
     得到了以下的主要结论:
     一、通过对钢纤维混凝土结构的分析和实验,发现界面特征对钢纤维混凝土性能的重要性,而海水腐蚀会影响钢纤维水泥基界面的粘结性能。
     界面粘结性能是保证钢纤维混凝土优良工作性能的关键,但同时它也是钢纤维混凝土复合材料最薄弱的环节。观测到海水环境腐蚀前后,钢纤维水泥基界面结构和界面粘结强度发生了较大变化:经历模拟海水腐蚀循环后,钢纤维水泥基界面层明显变厚,显微硬度变小,腐蚀环境使得界面层中的弱谷变得更弱,最薄弱点性状与基体的差别越发显著,界面层被削弱。
     海水腐蚀环境使钢纤维与水泥基的界面平均粘结强度、纤维脱粘与拔出时所做的功均有明显下降。腐蚀后,纤维与水泥基的界面平均粘结强度降低了20%,而纤维脱粘与拔出时所做的功下降了40%。
     二、通过对比试验,发现海水腐蚀前后,钢纤维混凝土构件的抗折强度和弯曲韧性变化较大。
     钢纤维弥补了混凝土抗拉强度低的弱点,当钢纤维混凝上基体开裂以后,跨越桥接裂缝的钢纤维开始发挥作用,继续承担由混凝土基体传来的应力。随着裂缝的发展,钢纤维的作用逐渐增大,经过纤维不断的被拔出,曲线逐渐转为下降趋势。从破坏形态来看,未腐蚀试件和受腐蚀的试件开裂时均是首先在纯弯段出现细观裂缝,随着荷载的增加,裂缝不断变宽并向上开展,形成一条主裂缝,这时试件的承载能力显著下降。当裂缝延伸到一定程度时,钢纤维被拔出,试件破坏。
     钢纤维混凝土被腐蚀后,钢纤维混凝土试件虽没有出现混凝土剥离现象,但外表均有钢纤维锈迹,钢纤维与混凝土间的粘结性能大大降低,钢纤维的作用未能有效发挥,钢纤维过早被拔出。当钢纤维体积率在0.5%~1.0%时,海水腐蚀会导致钢纤维混凝土构件的抗折强度下降26%~38%。钢纤维混凝土受腐蚀后,试件的韧性降低,钢纤维混凝土构件腐蚀后的弯曲承载能力变化系数降低约29%。腐蚀后,钢纤维对混凝土基体的增韧增强作用减弱。
     三、根据腐蚀对钢纤维混凝土界面及宏观力学性能的研究结果,发现钢纤维自身的耐腐蚀性能是保证界面粘结强度和构件强度的关键。结合混凝土工程中的钢材防腐处理措施,同时考虑工程实用性,提出了磷酸锌改性钢纤维的腐蚀防护工艺,并通过加速腐蚀试验证实磷酸锌改性钢纤维自身有着较好的耐海水腐蚀性能。
     四、因钢纤维混凝土界面的粘结性能始终是钢纤维混凝土优良工作状态的保证,所以通过界面试验和宏观力学试验进一步检验了磷酸锌改性钢纤维与混凝土界面结构和粘结强度以及构件的强度和韧性。试验证明:磷酸锌改性钢纤维混凝土不仅有良好的耐腐蚀性,同时有较优良的界面特性和力学性能。在模拟海水腐蚀环境中,磷酸锌改性钢纤维混凝土的强度和韧性没有降低。
     五、本论文尝试从工程实用角度,结合现有强度理论的特点,提出考虑腐蚀影响效应的钢纤维混凝土强度计算模式。模式的形式简单实用,其中的参数具有明确的物理意义,模式的形式具有普遍适用意义。计算模式的计算结果和试验数据吻合较好。
Concrete is widely used as building material. But the concrete will become fragile with the increasing of its strength. Fiber can greatly improved strength, toughness and crack resistance of concrete material. And steel fiber reinforced concrete(SFRC) has more excellent bearing capacity than other synthetic fiber reinforced concrete, which is very fit for bearing high loads. So it develops very quickly in the fields of transportation, architecture and irrigation works, etc. But in worse marine environment, corrosion will occur in SFRC, and reduce the performance of the structure.
     Some tasks were finished in the paper: The reinforcement mechanism and corrosion mechanism of SFRC was studied, and the corrosion effect on interface and mechanical property was the focus; A new zinc phosphate chemical treatment was put forward, which can improve corrosion-resistance ability of the steel fiber; The corrosion effect on property of ZnPh steel fiber reinforced concrete was studied; Strength calculation mode of SFRC beam was put forward.
     The following conclusions were obtained:
     1. Based on the analysis of SFRC structure and the experimental results, it was found that the interface characteristics is the most important to the performance of SFRC, and marine corrosion will affect the interface bond between steel fiber and cement matrix.
     Interface bond property is the guarantee for SFRC maintaining excellent work performance, but it is also the weakest of steel fiber reinforced concrete composite. It was observed that interfacial structure and interface bond strength had great difference before and after corrosion in marine environment. After corrosion, the interfacial layer obviously became thick, and the micro-hardness was decreased. Corrosion environment reduced the interfacial layer, and the difference between layer and cement matrix became greater.
     In marine corrosion environment, the average bond strength of interface between steel fiber and cement was reduced about 20%, and the energy of pulling-out fiber from cement was obviously declined about 40% after the steel fiber was corroded.
     2. By contrast tests, it was found that the change of rupture strength and flexural toughness of SFRC beam before and after corrosion in the simulated seawater was great.
     Steel fiber improved the lower tensile strength of concrete. When the matrix of SFRC cracked, the steel fibers bridging cracks started to be in action, and the steel fibers continued to undertake the stress transferred from concrete. With the development of cracks, steel fiber’s effect increased gradually. After fiber was pulled out, the curve of load and displacement declined. Fine cracks were first appears in pure bending section for all the specimens which was corroded or not corroded. With the load increasing, wider cracks appeared and went upward, which formed a main fracture. While the bearing capacity of the specimen decreased significantly. The steel fiber was pulled out from concrete and the beam was broken when the crack extended to certain degree.
     After the corrosion of SFRC, there was surface rust but no concrete stripping of SFRC beams. Bond property between steel fiber and concrete was greatly reduced, and steel fiber didn’t give its full efficiency because of being pulled out early. When the steel fiber volume rate is at 0.5% ~ 1.0%, the rupture strength of SFRC beam reduced about 26% ~ 38% because of corrosion. After corrosion, the toughness of SFRC beam was also reduced, and the bending capability coefficient is down about 29%. The reinforcement efficiency of steel fiber was weakened after corrosion.
     3. According to the research results on the SFRC interface and macroscopic mechanical properties, it was confirmed that the corrosion resistance of steel fiber itself is the guarantee for the interface bond strength and the component strength. After studying anticorrosive measures of steel in concrete and engineering practicability, the method of zinc phosphate modified steel fiber(ZnPh fiber) was put forward. The result of accelerated corrosion test showed that zinc phosphate modified steel fiber had good corrosion resistance to salt water.
     4. Because the good interfacial bond is always the guarantee for good working performance of SFRC, the interface experiment and macroscopic mechanical test were done to test interfacial microstructure , bond strength between ZnPh fiber and concrete, strength and toughness of ZnPh fiber reinforced concrete beam. Experimental results showed that the ZnPh fiber not only had good corrosion resistance, but also had good interfacial characteristics with cement matrix, while ZnPh fiber reinforced concrete beam had good mechanical property. After corrosion, the strength and toughness of ZnPh fiber reinforced concrete beam didn’t decreased.
     5、Combining the strength theories, a new strength calculating mode of SFRC with considering corrosion was put forward from the view of engineering practicality. The mode has simple form, in which the parameters have clear physics meaning. This style can be applied commonly. The result of calculation fit with the test data well.
引文
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