偏高岭土基地聚合物改良土的冻胀融沉特性研究

doi:10.16552/j.cnki.issn1001-1625.2025.0618

摘要/Abstract

摘要： 地聚合物是一类以富硅铝酸盐固体工业废弃物为前驱物,在碱激发作用下经过解聚、单体重构及缩聚反应形成的无机胶凝材料,可以代替水泥来处理软弱土层。为研究地聚合物改良土的冻胀融沉特性,采用偏高岭土基地聚合物对福州市的海相沉积粉质黏土进行处理,以养护龄期、冷端温度、激发剂模数、水玻璃-偏高岭土(S-MK)质量比及地聚合物掺量为影响因素,对改良土进行不同因素多水平条件下的冻胀融沉试验。结果表明,改良后土体冻胀融沉性质明显减弱,冻胀率与融沉系数随着养护龄期、地聚合物掺量的增加而递减,随激发剂模数、S-MK质量比的增加而增大,而当冷端温度降低时,冻胀率与融沉系数则均呈直线下降。通过对比发现,相同掺量下,地聚合物改良土的冻胀率与融沉系数明显低于水泥改良土。

关键词: 地聚合物, 偏高岭土, 改良土, 粉质黏土, 冻胀率, 融沉系数

Abstract: Geopolymer is a kind of inorganic cementitious material formed by the process of depolymerization, monomer reconstruction and polycondensation reactions under alkali activation with solid industrial waste rich in aluminosilicate as precursor, which can be used to replace cement in treating weak soil layers. In order to study the frost heave and thaw settlement characteristics of geopolymer modified soil, metakaolin-based geopolymer was used to treat marine sedimentary silty clay in Fuzhou. The frost heave and thaw settlement tests of the modified soil were conducted under different levels of multiple factors, including curing age, cold end temperature, activator modulus, sodium silicate to metakaolin (S-MK) mass ratio and geopolymer content. The results show that the frost heave and thaw settlement characteristics of the modified soil are significantly weakened. The frost heave rate and thaw settlement coefficient decrease with the increase of curing age and geopolymer content, and improve with the increase of activator modulus and S-MK mass ratio. When the cold end temperature decreases, both of them reduce linearly. Through comparison, it is found that the frost heave rate and thaw settlement coefficient of geopolymer modified soil are significantly lower than those of cement modified soil under the same geopolymer content.

Key words: geopolymer, metakaolin, modified soil, silty clay, frost heave rate, thaw settlement coefficient

中图分类号:

TU59

范厚朝, 朱杰, 吴海波, 张忠伦, 鄢自刚, 李林, 唐文铖. 偏高岭土基地聚合物改良土的冻胀融沉特性研究[J]. 硅酸盐通报, 2025, 44(12): 4395-4405.

FAN Houchao, ZHU Jie, WU Haibo, ZHANG Zhonglun, YAN Zigang, LI Lin, TANG Wencheng. Frost Heave and Thaw Settlement Characteristics of Metakaolin-Based Geopolymer Modified Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4395-4405.

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