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为研究不同粉煤灰替代率对混凝土内钢筋腐蚀行为的影响,制作了粉煤灰替代率0%,15%,30%和45%和氯离子含量0.1%,0.5%,1.5%,3.0%和5.0%的混凝土试件.对混凝土内钢筋的腐蚀电流密度、腐蚀电位、阴极极化曲线、混凝土电阻率、混凝土孔隙液pH值等进行了测量.结果表明,钝化状态的钢筋,随着粉煤灰替代率的增加,钢筋腐蚀电位显著增大,而腐蚀电流密度均维持在较低水平无明显变化;活化状态的钢筋,随着粉煤灰替代率的增加,钢筋腐蚀电流密度显著下降,且氯离子含量越高,钢筋腐蚀电流密度的降幅越大,最大降幅达84%,而腐蚀电位均维持在较低负值水平无明显变化.粉煤灰的添加可以起到对混凝土内钢筋腐蚀的保护作用.
In order to study the effect of different fly ash replacement rates on the corrosion behavior of steel bars in concrete, the replacement rates of fly ash were 0%, 15%, 30% and 45% and the chloride ion contents were 0.1%, 0.5%, 1.5% and 3.0% And 5.0% of the concrete specimens.The corrosion current density, corrosion potential, cathodic polarization curve, concrete resistivity, pH value of concrete pore fluid and so on were measured.The results show that the passivation state of steel, with With the increase of the replacement rate of fly ash, the corrosion potential of steel increases significantly, while the corrosion current density remains unchanged at a low level. With the increase of fly ash replacement rate, the corrosion current density of steel decreases significantly , And the higher the content of chloride ions, the greater the decrease of the corrosion current density of steel bar, the largest drop of 84%, while the corrosion potential is maintained at a lower negative level no significant change. The addition of fly ash can play a concrete reinforcement Corrosion protection.