铁尾矿混凝土抗硫酸盐腐蚀性能和微观结构特征

Sulfate Corrosion Resistance and Microstructure Characteristics of Iron Tailings Concrete

这是一篇陶瓷及复合材料领域的论文。本文研究了硫酸钠溶液腐蚀铁尾矿混凝土的力学特性和耐久性,分析了不同铁尾矿掺量、腐蚀循环次数、硫酸钠溶液浓度对其力学性质和耐久性的影响。结果表明:在铁尾矿掺量为30%、腐蚀循环次数为60次和硫酸钠浓度为5%时,混凝土各项性能指标达到较佳状态。随着铁尾矿掺量的不断增大,混凝土的抗氯离子侵蚀性能和抗冻性能越好,水化反应放热量却不断减小,而混凝土的孔隙率和总进汞体积变化规律均呈现出先减小后增大的趋势。在同一铁尾矿掺量条件下,经腐蚀作用后混凝土主峰幅值的变化规律呈现出不断增大的趋势;而在同一硫酸钠溶液浓度条件下,经腐蚀作用后混凝土主峰幅值的变化规律呈现出先减小后增大的趋势。

This is an article in the field of ceramics and composites.Mechanical properties and durability of sodium sulfate solution corrosion of iron tailings concrete are developed.The effects of different iron tailings content,the number of dry and wet cycles,and the concentration of sodium sulfate solution on its mechanical properties and durability are analyzed.The results show that when the iron tailings content is 30%,the number of dry and wet cycles is 60 times,and the sodium sulfate concentration is 5%,the performance indicators of the concrete reach the best state.With the increasing amount of iron tailings,the better the corrosion resistance and frost resistance of concrete will be.The heat of hydration reaction is constantly decreasing.The porosity of concrete and the change of total mercury volume show a trend of first decreasing and then increasing.Under the same condition of iron tailings content,the change law of the main peak amplitude of concrete after corrosion shows an increasing trend.However,under the same sodium sulfate solution concentration,the main peak amplitude of concrete showed a trend of first decreasing and then increasing after corrosion.