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摘要:
这是一篇陶瓷及复合材料领域的论文。本研究以不同粒径的钢渣粉为掺合料，制备了C30混凝土，研究了钢渣粉粒径对混凝土耐久性的影响。实验结果表明：混凝土内部孔隙主要集中在100～1000 nm，且孔的数量随着钢渣粉的细化而不断减少，其10～100 nm左右的孔隙随着钢渣的细化而增多。钢渣的掺入可改善混凝土的工作性；随着钢渣不断细化，混凝土的7、28及56 d抗压强度均呈现出先降低后增加的趋势，其56 d抗压强度由50.4 MPa降低到了37.8 MPa又不断增加到40.32、42.84、45.36及48.4 MPa，随着钢渣细度由23.1 μm不断减小到16.8、12.2、10.1、4.2 μm钢渣活性由75%增加到了96%。冻融循环100次后，未掺钢渣组的混凝土质量损失为7.6%，当掺入30%钢渣后，混凝土的抗冻性能减弱，随着钢渣细度的变化，混凝土的抗冻性能不断增强，当细度为10.1、4.2 μm时其质量损失降低到了7.4%及6.1%。钢渣的掺入能够促进混凝土对CO2的固化封存能力，增强混凝土的抗压强度，钢渣越细混凝土抗碳化能力越强。
Abstract:This is an article in the field of ceramics andcomposites. C30 concrete was prepared with steel slag powder with different particle size as admixture, and the effect of steel slag powder particle size on the durability of concrete was studied. The test results show that the internal pores of concrete are mainly concentrated in 100~1000 nm, and the number of pores decreases with the refinement of steel slag powder, and the pores of about 10~100 nm increase with the refinement of steel slag. The addition of steel slag can improve the workability of concrete; With the continuous refinement of steel slag, the 7, 28 and 56 d compressive strength of concrete decreases first and then increases. The 56 d compressive strength decreases from 50.4 MPa to 37.8 MPa and continues to increase to 40.32, 42.84, 45.36 and 48.4 MPa. With the fineness of steel slag from 23.1 MPa decreases to 16.8、12.2、10.1、4.2 μm. The activity of m steel slag increased from 75% to 96%. After 100 freeze-thaw cycles, the mass loss of concrete without steel slag group is 7.6%. When 30% steel slag is added, the frost resistance of concrete decreases. With the change of steel slag fineness, the frost resistance of concrete increases continuously, when the fineness is 10.1、4.2 μm, the mass loss is reduced to 7.4% and 6.1%. The addition of steel slag can promote the solidification and storage capacity of concrete to CO2 and enhance the pressure strength of concrete. The finer the steel slag is, the stronger the carbonization resistance of concrete is.
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Key words:
- Ceramics and composites /
- Steel slag /
- Workability /
- Durability /
- Porosity
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表 1 原材料化学组成/%
Table 1. Chemical composition of raw materials
名称 CaO Al2O3 SO3 SiO2 Fe2O3 K2O Na2O MgO TiO2 累计 水泥 69.19 5.2 2.71 15.99 3.99 0.03 0.08 2.14 0.63 99.96 粉煤灰 2.48 28.09 1.31 58.93 3.42 2.61 0.36 0.95 1.38 99.53 钢渣 36.36 6.56 0.29 11.88 35.22 0.04 0.04 8.6 0.8 99.79 
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表 2 混凝土配合比设计/（kg/m3）
Table 2. Concrete mix ratio design
编号 水 钢渣粉 水泥 粉煤灰 砂 碎石 外加剂 C30-0 165 0 280 65 620 1008 7.21 C30-1-20 165 84 196 65 620 1008 7.21 C30-2-40 165 84 196 65 620 1008 7.21 C30-3-60 165 84 196 65 620 1008 7.21 C30-4-80 165 84 196 65 620 1008 7.21 C30-5-100 165 84 196 65 620 1008 7.21
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