Compression Characteristics and Microstructure of Ferric-aluminum Slag Modified Concrete
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摘要:
通过将不同掺量的铁铝渣添加到砂浆中以制备改性混凝土。开展压缩实验、计算机断层(CT)扫描实验和电子显微镜扫描实验对掺铁铝渣混凝土进行力学性能和细观结构特征的探究。实验结果表明: 随铁铝渣掺量的增加，混凝土试件的抗压强度和弹性模量呈先升后降的变化趋势，确定铁铝渣掺量为15%是混凝土较佳改性掺量；根据混凝土的二维CT图像计算了材料的孔隙度，随着掺量增加，掺铁铝渣混凝土内孔隙度逐渐减小，孔隙度与抗压强度呈现负相关的线性关系；铁铝渣的改性作用促进了水泥砂浆的二次水化反应，使得混凝土中的Ca(OH)2含量减少，水化硅酸钙（C-S-H）的含量增加，最终引起骨料间的裂隙闭合，材料整体力学性能提升。
Abstract:Modified concrete was prepared by adding different amounts of iron and aluminium slag into mortar. Compression tests, computed tomography (CT) scans and electron microscope scans were carried out to investigate the mechanical properties and fine structural characteristics of the ferric-aluminum slag doped concrete. The results showed that the compressive strength and modulus of elasticity of the concrete specimens showed an increasing and then decreasing trend with the increase in the amount of ferric-aluminum slag, and the optimum amount of Fe-Al slag was determined to be 15%. The modifying effect of ferric-aluminum slag promoted the secondary hydration reaction of cement mortar, resulting in a reduction of Ca(OH)2 content and an increase of hydrated calcium silicate (C-S-H) content in the concrete, which eventually caused the closure of cracks between the aggregates and improved the overall mechanical properties of the material.
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Key words:
- concrete /
- ferric-aluminum slag /
- microstructure /
- compression properties /
- microstructural mechanism
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表 1 混凝土试件的配合比
Table 1. Mass proportion of concrete samples
铁铝渣掺量/% 单位体积的质量/(kg/m3) 铁铝渣 砂 碎石 水泥 粉煤灰 0 0 650 1 050 375 125 5 110 650 1 050 375 125 10 220 650 1 050 375 125 15 330 650 1 050 355 105 20 440 650 1 050 375 125 
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