矿渣-电石渣复合改良滨海盐渍土强度特性及微观
机制研究

金属矿山 ›› 2025, Vol. 55 ›› Issue (8): 298-305.

矿渣-电石渣复合改良滨海盐渍土强度特性及微观机制研究

唐雨孜　张　鹏　刘　鸣　张青云　孙　健　赵　旭

青岛理工大学土木工程学院,山东青岛 266520

出版日期:2025-09-15 发布日期:2025-09-16
通讯作者: 张　鹏(1985—),男,教授,博士,博士研究生导师。
作者简介:唐雨孜(2000—),女,硕士研究生。
基金资助:
国家自然科学基金项目(编号:42177167)。

Study on Strength Characteristics and Microscopic Mechanism of Slag and Calcium Carbide Slag Composite Improvement of Coastal Saline Soil

TANG Yuzi　 ZHANG Peng　 LIU Ming　 ZHANG Qingyun　 SUN Jian　 ZHAO Xu

College of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China

Online:2025-09-15 Published:2025-09-16

摘要/Abstract

摘要： 我国沿海地区盐渍土分布广泛且盐渍化程度高,难以直接用于路基填料等工程建设。选用电石渣-矿渣作为复合地质聚合物固化剂(CSG),在 NaOH、水玻璃碱激发作用下,研究滨海盐渍土改良后的强度特性与增强固化机理。以无侧限抗压强度为测试指标,在冻、盐环境下对比研究改良盐渍土与水泥土的固化效果。研究结果表明, 固化盐渍土 28 d 无侧限抗压强度为 3. 47 MPa,比同掺量的水泥固化土强度提高了 8. 8%;10 次冻融循环的水泥土强度仅为 CSG 土强度的 66. 7%,CSG 固化土具有更好的抗冻性能;盐溶液侵蚀后固化土强度最低能达到 2. 21 MPa,强度下降幅度小于水泥土,CSG 固盐效果较好。 X 射线衍射(XRD)与扫描电镜( SEM)发现,CSG 固化盐渍土在水化过程中生成了 C-(A)-S-H 凝胶、钙矾石(AFt)、Friedel 盐(3CaO·Al 2O3·CaCl 2·10H2O)等,大量的胶凝物质充填在土壤颗粒表面或间隙中,水化产物相互交织粘结提高了固化土强度。研究为滨海盐渍土地区工程建设与固废资源化利用提供了思路。

关键词: 滨海盐渍土　地质聚合物　抗压强度　冻、盐环境　微观机制

Abstract: Saline soil is widely distributed and highly salinized in the coastal areas of China,so it is difficult to be directly used in the construction of roadbed fillers. Using calcium carbide slag as composite geopolymer curing agent (CSG),the strength characteristics and enhanced curing mechanism of improved coastal saline soil were studied under the excitation of NaOH and sodium silicate alkali. Taking the unconfined compressive strength as the test index,the curing effect of modified saline soil and soil-cement was compared in freezing and salt environment. The results showed that the 28 d unconfined compressive strength of solidified saline soil is 3. 47 MPa,which is 8. 8% higher than that of solidified soil with the same amount of cement. After 10 freeze-thaw cycles,the strength of soil-cement is only 66. 7% of that of CSG soil,and CSG solidified soil has better freeze-resistance. The minimum strength of the solidified soil after salt solution erosion can reach 2. 21 MPa,and the strength decline is smaller than that of cement soil,and the effect of CSG on salt fixation is better. X-ray diffraction (XRD) and scanning electron microscopy ( SEM ) found that C - ( A ) - S - H gel, ettringite ( AFt ) and Friedel salt (3CaO·Al 2O3·CaCl 2·10H2O) were formed in the hydration process of CSG solidified saline soil,and a large amount of cementation materials were filled in the surface or gaps of soil particles. The hydration products interweave and bond to improve the strength of solidified soil. This study provides ideas for engineering construction and resource utilization of solid waste in coastal saline soil area.

Key words: coastal saline soil,geopolymer,compressive strength,freezing and salt environment,microscopic mechanism

中图分类号:

TU447

唐雨孜　张　鹏　刘　鸣　张青云　孙　健　赵　旭. 矿渣-电石渣复合改良滨海盐渍土强度特性及微观机制研究 [J]. 金属矿山, 2025, 55(8): 298-305.

TANG Yuzi　 ZHANG Peng　 LIU Ming　 ZHANG Qingyun　 SUN Jian　 ZHAO Xu. Study on Strength Characteristics and Microscopic Mechanism of Slag and Calcium Carbide Slag Composite Improvement of Coastal Saline Soil [J]. Metal Mine, 2025, 55(8): 298-305.

扫码分享