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

Abstract

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

CLC Number:

TQ136.1

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.

Figures/Tables 15

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References 17

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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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of shrinkage-resistant ultra-high performance concrete from ferrochrome slag and its microstructure

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