Experimental Study on Carbonization Resistance of Concrete Containing Iron Tailings
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摘要: 研究了碳化环境下含铁尾砂混凝土的抗碳化性能及抗压强度变化规律。通过设计正交试验对水胶比、铁尾矿砂掺量以及胶凝材料用量三个因素进行分析讨论。结果表明:水胶比和铁尾矿砂掺量是影响含铁尾砂混凝土抗碳化性能最主要的因素。铁尾矿砂掺量越大,混凝土越容易碳化,而水胶比为0.4的混凝土抗碳化性能最佳。微结构表明,随着水化过程的进行,水化产物钙矾石和水化硅酸钙凝胶交织生长并形成致密的结构,碳化后钙矾石分解成方解石,导致结构致密性显著降低。Abstract: The carbonization resistance and mechanical properties of concrete containing iron tailings sand under carbonization environments were investigated in this paper.Three factors including water-binder ratio,iron tailings sand content and binder content were analyzed and discussed by orthogonal tests.The results indicate that that water-binder ratio and iron tailings sand content are the most important factors affecting carbonization resistance of the concrete.The concrete is easier carbonized with higher iron tailings sand content,while the concrete containing iron tailings sand with water-binder ratio of 0.4 has the best carbonization resistance.The microstructure shows that ettringite（AFt）and C-S-H gel grow and form dense structure during the hydration process,and AFt decomposes into calcite after carbonization resulting in a significant reduction in structural compactness.
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Key words:
- iron tailings sand /
- concrete /
- carbonization resistance /
- water-binder ratio /
- microstructure /
- hydration process
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