高炉矿渣-电石渣复合改良膨胀土工程特性与机理研究

doi:10.16552/j.cnki.issn1001-1625.2024.0980

摘要/Abstract

摘要： 膨胀土因具有吸水膨胀软化、失水收缩开裂等特性不宜直接用于路基填方。采用高炉矿渣、电石渣复合改良膨胀土,通过击实试验、自由膨胀率试验、无侧限抗压强度试验和水稳定性试验,研究不同配比对改良膨胀土强度、水稳定性等工程特性的影响;开展X射线衍射和扫描电子显微镜等微观测试,研究高炉矿渣、电石渣对膨胀土的复合改良机理。结果表明:掺入高炉矿渣、电石渣能抑制膨胀土的膨胀特性,提升膨胀土强度和水稳定性,6%(质量分数)的高炉矿渣和6%(质量分数)的电石渣复合改良效果最佳,养护后自由膨胀率降低至11%,无侧限抗压强度达到2.84 MPa,水稳定系数为82.5%;高炉矿渣、电石渣与膨胀土之间发生水化反应生成水化硅酸钙、水化铝酸钙和钙矾石,水化产物相互胶结,填充土体孔隙并黏结土颗粒,使土体更加密实,从而提升改良膨胀土的强度。研究成果为高炉矿渣、电石渣复合改良膨胀土在路基工程中的应用提供参考。

关键词: 膨胀土, 高炉矿渣, 电石渣, 工程特性, 改良机理, 路基工程

Abstract: Expansive soil is not suitable to be directly used for roadbed filling due to its characteristics of expansive softening by water absorption and shrinkage and cracking by water loss. The ground granulated blast slag (GGBS) and carbide slag (CS) were used to improve expansive soil. Through the compaction test, free expansion rate test, unconfined compressive strength test, and water stability test, the impacts of different ratios on the strength, water stability, and other engineering characteristics of improved expansive soil were studied. X-ray diffraction and scanning electron microscopy and other microscopic tests were carried out to study the composite improvement mechanism of GGBS and CS on expansive soil. The results show that the incorporation of GGBS and CS can inhibit the expansion characteristics of expansive soil and improve its strength and water stability. The composite improvement effect of 6%(mass fraction) GGBS and 6%(mass fraction) CS is the best, at this moment the free expansion rate is reduced to 11% after curing, the unconfined compressive strength is 2.84 MPa, and the water stability coefficient is 82.5%. Hydration reaction occurs between GGBS, CS, and expansive soil to form hydrated calcium silicate, hydrated calcium aluminate, and ettringite. Hydration products are cemented with each other, filling soil pores and bonding soil particles, making the soil denser, thereby improving the strength of improved expansive soil. The research results provide a reference for the application of GGBS and CS composite to improve expansive soil in roadbed engineering.

Key words: expansive soil, ground granulated blast slag, carbide slag, engineering property, improvement mechanism, roadbed engineering

中图分类号:

TU443

胡其志, 李俊杰, 陶高梁, 李子天. 高炉矿渣-电石渣复合改良膨胀土工程特性与机理研究[J]. 硅酸盐通报, 2025, 44(2): 602-612.

HU Qizhi, LI Junjie, TAO Gaoliang, LI Zitian. Engineering Property and Mechanism of Ground Granulated Blast Slag-Carbide Slag Composite Improved Expansive Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(2): 602-612.

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