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DOI: https://doi.org/10.11988/ckyyb.20241238

AS碱激发硅酸钠增强水泥土强度及作用机理研究

  • 罗沈 , 1, 2 ,
  • 王俊杰 1 ,
  • 黄文聪 1, 2 ,
  • 张伟锋 , 1
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  • 1.华南农业大学 水利与土木工程学院， 广州 510642
  • 2.广东电网有限责任公司 中山供电局，广东 中山 528401
张伟锋(1968-)，男，河南长葛人，教授，博士，主要从事特殊土工程性质和岩土工程加固方面的研究。E-mail:

罗 沈(1974-)，男，广东梅州人，高级工程师，硕士，主要从事电力工程基础的研究。E-mail:

收稿日期: 2024-12-03

  修回日期: 2025-02-21

  网络出版日期: 2025-03-31

基金资助

南方电网公司科技项目资助(GDKJXM20230271)

南方电网公司科技项目资助(GDKJXM20230273)

华南农业大学大学生创新训练项目(2023105641125)

华南农业大学大学生创新训练项目(2023105641178)

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Study on the Strength Enhancement and Mechanism of Action of Sodium Silicate Excited by AS Alkali on Hydraulic Soil

  • LUO Shen , 1, 2 ,
  • WANG Jun-jie 1 ,
  • HUANG Wen-cong 1, 2 ,
  • ZHANG Wei-feng , 1
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  • 1. South China Agricultural University,College of Water Conservancy and Civil Engineering,Guangzhou 510642, China
  • 2. Guangdong Power Grid Corporation,Zhongshan Power Supply Bureau,Zhongshan 528401, China

Received date: 2024-12-03

  Revised date: 2025-02-21

  Online published: 2025-03-31

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摘要

为探究多种固化剂和不同龄期条件下淤泥地基的强度变化规律。试验以木钙(LA)、三乙醇胺(TEA)、碱激发硅酸钠（AS）作为固化剂分别对淤泥进行固化试验，以试块抗压强度为指标，发现一定配比下单掺LA、TEA以及AS可作为固化剂增强水泥土固化强度。选定三组固化剂的优掺量进行三掺固化试验，发现单掺AS固化效果优于其他组及三掺试验组。同时运用扫描电镜（SEM）分析其固化机理，并采用ArcGIS将未加固土、加固土的SEM图像构建及处理成三维图像后，计算分析土样孔隙率和颗粒分形维数。当水泥掺量为18%、AS掺量为0.9%时加固土抗压强度达到最大值2.39MPa，此时试样孔隙率最低为27.27%，颗粒分形维数最大为1.8535；试样孔隙率和抗压强度呈非线性的递减关系，试样颗粒分形维数和抗压强度呈非线性的递增关系。当施工现场不具备提供标准试样时，可以采用颗粒分形维数初步推断试样抗压强度的大小。

关键词： 固化剂; 淤泥地基; 抗压强度; 扫描电镜; 分形维数

本文引用格式

罗沈 , 王俊杰 , 黄文聪 , 张伟锋 . AS碱激发硅酸钠增强水泥土强度及作用机理研究[J]. 长江科学院院报, 0 . DOI: 10.11988/ckyyb.20241238

Abstract

In order to investigate the change rule of strength of silt foundation under multiple curing agents and different age conditions. Experiment to wood calcium (LA), triethanolamine (TEA), alkali stimulation of sodium silicate (AS) as curing agent were curing test on silt, to the compressive strength of the test block as an indicator, found that a certain proportion of single mixing of LA, TEA, and AS can be used as a curing agent to enhance the strength of curing of cemented soils. The optimal dosage of the three groups of curing agents was selected for the three-mixed curing test, and it was found that the curing effect of single-mixed AS was better than that of the other groups and the three-mixed experimental group. At the same time, scanning electron microscope (SEM) was used to analyze the curing mechanism, and after constructing and processing the SEM images of the unconsolidated and consolidated soils into three-dimensional images using ArcGIS, the porosity of the soil samples and the fractal dimension of the particles were calculated and analyzed. The compressive strength of reinforced soil reaches the maximum value of 2.39MPa when the cement doping is 18% and AS doping is 0.9%, at this time, the porosity of the specimen is the lowest at 27.27%, and the fractal dimension of the particles is the largest at 1.8535; there is a nonlinear decreasing relationship between the porosity of the specimen and compressive strength, and the fractal dimension of the particles of the specimen and the compressive strength are in a nonlinear increasing relationship.When the construction site is not available to provide a standard specimen, the size of the specimen compressive strength can be initially inferred using the particle fractal dimension.

Key words： curing agents; silt foundation; compressive strength; scanning electron microscope; fractal dimension

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