铬铁渣制备抗收缩超高性能混凝土及其微观结构研究

doi:10.19964/j.issn.1006-4990.2024-0601

摘要/Abstract

摘要：

针对天然骨料不足，超高性能混凝土成本高及生产过程碳排放高的问题，采用铬铁渣微粉和铬铁渣骨料分别取代部分水泥和石英砂的方式制备铬铁渣超高性能混凝土（FCS-UHPC）。研究制备不同铬铁渣替代量（0~100%）的FCS-UHPC，并开展其工作性能测试、力学性能试验及收缩性能试验，通过扫描电镜SEM及EDS能谱对微观结构进行研究。结果表明：随着铬铁渣骨料替代量的增加，FCS-UHPC的扩展度呈现下降趋势，当铬铁渣骨料掺量为75%（质量分数，下同）时，FCS75的28 d力学性能最好，其抗压强度和抗折强度分别达到137.6 MPa和28.6 MPa；此时，混凝土内部的微观结构最密实，基体内部有镁的水化产物，生成氢氧化镁（MH）和水化硅酸镁凝胶（MSH）；此外，当铬铁渣骨料替代率为100%时，FCS100的自收缩率和干燥收缩率最低，分别为4.13×10^-4和1.65×10^-4，相较于基准组分别降低了46.2%和45.4%，这说明铬铁渣骨料可明显改善UHPC的自收缩率和干燥收缩率。

关键词: 铬铁渣, 超高性能混凝土, 收缩性能, 力学性能, 微观结构

Abstract:

Ferrochrome slag micropowder and ferrochrome slag aggregate were used to prepare ferrochrome slag ultra-high-performance concrete（FCS-UHPC） by replacing part of the cement and quartz sand，which helped to make up for the lack of natural aggregates and reduce the cost of UHPC as well as the carbon emissions of the production process.In this experiment，FCS-UHPC with different amounts of ferrochrome slag substitution（0~100%） were prepared，and the working performance test，mechanical performance test and shrinkage performance test were also carried out，and its microstructure was analyzed by scanning electron microscope SEM and EDS energy spectroscopy test.The results showed that the ductility of FCS-UHP was decreased with the increase of the replacement rate of ferrochromium slag aggregate.When the replacement rate of ferrochromium slag aggregate was 75%，the mechanical properties of FCS75 were the best in 28 d and its compressive and flexural strengths reached 137.6 MPa and 28.6 MPa.In addition，the concrete had the densest internal microstructure，and there were hydrated products of magnesium in the matrix，which produced magnesium hydroxide（MH） and hydrated magnesium silicate gel （MSH）.Moreover，when the replacement rate of ferrochrome slag aggregate was 100%，the self-shrinkage and drying shrinkage of FCS100 were the lowest，which were 4.13×10^-4 and 1.65×10^-4，respectively，and were reduced by 46.2% and 45.4%，respectively，compared with the baseline group，which indicated that ferrochrome slag aggregate could significantly improve the self-shrinkage and drying shrinkage of UHPC.

Key words: ferrochrome slag, ultra-high performance concrete, shrinkage properties, mechanical properties, microstructure

中图分类号:

TQ136.1

杭美艳, 宋洪彬, 刘佳棋. 铬铁渣制备抗收缩超高性能混凝土及其微观结构研究[J]. 无机盐工业, 2025, 57(12): 92-98.

HANG Meiyan, SONG Hongbin, LIU Jiaqi. Study on preparation of shrinkage-resistant ultra-high performance concrete from ferrochrome slag and its microstructure[J]. Inorganic Chemicals Industry, 2025, 57(12): 92-98.

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化学成分	w （CaO）/%	w （SiO₂）/%	w （Al₂O₃）/%	w （Fe₂O₃）/%	w （MgO）/%	w （SO₃）/%	w （Cr₂O₃）/%	w （损失量）/%	比表面积/ （m²·g^-1）	28 d活性指数/%
P·O52.5水泥	52.52	28.60	9.67	3.86	2.08	2.38	0	0.89	0.414
铬铁渣微粉	3.87	33.01	23.48	3.74	25.80	0.96	8.06	1.08	0.515	76
偏高岭土	0.14	55.08	43.11	0.78	0.16	0	0	0.73	0.765	106
硅灰	0.26	89.87	1.65	2.52	3.17	0	0	2.53	22.205	114

组别	a/×10^-6	b/×10^-6	x₀/h	p	R²
FCS00	48.49	746.34	9.74	6.27	0.990
FCS25	11.47	554.16	10.79	3.40	0.991
FCS50	24.73	492.29	10.81	4.42	0.982
FCS75	-21.25	468.67	13.55	2.28	0.977
FCS100	-14.08	409.93	13.16	2.84	0.984

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