Influence of CaCO<sub>3</sub> on Loess Liquid and Plastic Limits Under Weak Acid Erosion

MENG Jie; LI Xi; WU Jianhui; ZHANG Shuang; WANG Li; ZHANG Chen

doi:10.13961/j.cnki.stbctb.2018.03.019

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Influence of CaCO₃ on Loess Liquid and Plastic Limits Under Weak Acid Erosion

- Influence of CaCO₃ on Loess Liquid and Plastic Limits Under Weak Acid Erosion
- Bulletin of Soiland Water Conservation Vol. 38, Issue 3, Pages: 118-122(2018)
- 作者机构：
  
  1. 长安大学地质工程与测绘学院,陕西,西安,710054
  2. 国土资源部岩土工程开放研究实验室,陕西,西安,710054
  3. 河北省地矿局第一地质大队,河北,邯郸,056001
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2018.03.019
  CLC：
- Published：2018
- 稿件说明：
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MENG Jie, LI Xi, WU Jianhui, et al. Influence of CaCO₃ on Loess Liquid and Plastic Limits Under Weak Acid Erosion[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 118-122.
DOI：

MENG Jie, LI Xi, WU Jianhui, et al. Influence of CaCO₃ on Loess Liquid and Plastic Limits Under Weak Acid Erosion[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 118-122. DOI： 10.13961/j.cnki.stbctb.2018.03.019.

摘要

[目的]探讨碳酸钙赋存形式及其在黄土微结构中的作用，为弱酸侵蚀作用下碳酸钙对黄土液塑限的影响机理提供依据。[方法]首先采用蒸馏水洗去黄土中易溶盐，再经1 mol/L的醋酸溶液处理得到不同碳酸钙含量的黄土试样，采用液塑限联合测定仪测定黄土液塑限指标；借助扫描电子显微镜（SEM）对试样进行X射线能谱分析（EDX）获取元素Mapping图像进行分析。[结果]①醋酸作用下，液塑限随碳酸钙含量的减少而显著降低；②碳酸钙块、超细碳酸钙以骨架颗粒、集粒形式与Si，Al，Si-Fe接触，其主要作用为颗粒之间连接胶结作用以及充当黄土的孔隙骨架。[结论]醋酸处理前期以黏粒中碳酸钙溶解为主，进而黏粒的流失导致黄土砂化而最终影响了其液塑限指标。

Abstract

[Objective] To study the form of calcium carbonate and its effect on the loess microstructure in order to provide basis for the study of influence mechanism of calcium carbonate on the loess liquid and plasticity limits.[Methods] First

using distilled water to wash soluble salt in loess

and obtained loess samples with different contents of calcium carbonate processed by 1 mol/L acetic acid solution. Liquid and plastic limits joint meter was used to measure loess liquid plastic limit indicator. The scanning electron microscope (SEM) was used to analyze the X-ray energy dispersive microanlysis(EDX).[Results] ① Under the action of acetic acid

the liquid plastic limit decreased significantly with the decrease of calcium carbonate. ② Calcium carbonate blocks and superfine calcium carbonate were exposed as the skeleton and set granules to Si

Al and Si-Fe

and its main function was to connect the cementation between the particles and the pore skeleton of the loess.[Conclusion] In the early stage of acetic acid treatment

the calcium carbonate was mainly dissolved in the clay granule

and the loss of granule led to the loss of loess sand soil and eventually affected the liquid and plastic limit index.

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references

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Influence of CaCO3 on Loess Liquid and Plastic Limits Under Weak Acid Erosion

DOI：10.13961/j.cnki.stbctb.2018.03.019

摘要

Abstract

关键词

Keywords

references

Influence of CaCO₃ on Loess Liquid and Plastic Limits Under Weak Acid Erosion