Research on meso-structure of lightweight sand-EPS beads soil (LSES) using CT

WANG Shu-mao; GAO Yu-feng

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Research on meso-structure of lightweight sand-EPS beads soil (LSES) using CT

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- Research on meso-structure of lightweight sand-EPS beads soil (LSES) using CT
- Vol. 27, Issue 12, (2006)
- 作者机构：
  
  河海大学岩土工程研究所,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411.92
- Online First：09 December 2013，
  
  Published：2006
- 稿件说明：
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WANG Shu-mao, GAO Yu-feng. Research on meso-structure of lightweight sand-EPS beads soil (LSES) using CT[J]. 2006, 27(12).
DOI：

WANG Shu-mao, GAO Yu-feng. Research on meso-structure of lightweight sand-EPS beads soil (LSES) using CT[J]. 2006, 27(12). DOI：

摘要

利用医用CT机从定性和定量两个层面研究了砂土与EPS颗粒混合的轻质土（简称为LSES）这种新型土工材料的细观结构，分析了不同水泥掺量（CC）和EPS颗粒含量（Ve /Vs）下LSES不同扫描截面的CT图像以及平均CT数ME值和方差SD。随着CC的增加，ME值增加，LSES的结构更加密实，原生损伤减少，而随着Ve /Vs的增加，水泥水化物C-S-H包裹EPS颗粒表面和填充孔隙的效率都将下降，且Ve /Vs与ME值在本次试验范围内基本呈线性关系。此外，根据SD值在各截面处分布的不均匀性，认为LSES是局部孔隙比分布差异较大的特殊结构性土，CC和Ve /Vs是影响其结构性的主要因素。

Abstract

A qualitative and quantitative research is conducted on the meso-structure of a novel geo-material—lightweight sand-EPS beads soil (LSES) by a medical CT machine. CT images

average CT value(ME) and SDs for different scanning sections are analyzed under various cement contents(CC) and EPS-bead contents(Ve /Vs). With increasing CC

MEs increase

the structure of LSES become denser

hence the initial damages decrease. whereas when Ve /Vs increases

C-S-H has lower efficiency to coat EPS beads and infill the voids between particles; and Ve /Vs is linear to the MEs in this test. Additionally

due to different SD distribution for sections

LSES is defined as a special structural soil with highly different local void ratio distributions; and CC and Ve /Vs are the major factors influencing its structure.

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