Behavior and mechanism of laterite shrinkage inhibition 
with lime and meta-kaolin mixture

TAN Yun-zhi; HU Yan; DENG Yong-feng; CAO Ling; ZUO Qing-jun; MING Hua-jun

doi:10.16285/j.rsm.2018.1744

English Version Journal Login

您当前的位置：

首页 >

文章列表页 >

Behavior and mechanism of laterite shrinkage inhibition with lime and meta-kaolin mixture

更新时间：2026-06-25

- Behavior and mechanism of laterite shrinkage inhibition with lime and meta-kaolin mixture
- Vol. 40, Issue 11, Pages: 4213-4219(2019)
- 作者机构：
  
  1. 三峡大学特殊土土力学研究所,湖北,宜昌,443002
  2. 东南大学岩土工程研究所,江苏,南京,211189
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.1744
  CLC： TU446
- Online First：12 November 2019，
  
  Published：2019
- 稿件说明：
移动端阅览
TAN Yun-zhi, HU Yan, DENG Yong-feng, et al. Behavior and mechanism of laterite shrinkage inhibition with lime and meta-kaolin mixture[J]. 2019, 40(11): 4213-4219.
DOI：

TAN Yun-zhi, HU Yan, DENG Yong-feng, et al. Behavior and mechanism of laterite shrinkage inhibition with lime and meta-kaolin mixture[J]. 2019, 40(11): 4213-4219. DOI： 10.16285/j.rsm.2018.1744.

摘要

红黏土失水易收缩开裂而诱发工程灾害，为抑制或缓减红黏土的收缩特征，添加4%偏高岭土和5%石灰改善其水敏性。按照最优含水率制备压实试样，养护180 d后抽真空饱和，脱湿到预定含水率，随后开展收缩、无侧限抗压强度、吸力和孔隙分析等试验。结果表明，压实红黏土随着含水率降低，其无侧限抗压强度呈现先增大后减少的变化规律，这是脱湿导致的红黏土衍生微裂隙，进而引起结构性损伤所致。红黏土掺入石灰，尤其是掺入石灰-偏高岭土后，虽然脱湿也会引起强度减小，但接近完全干燥时，其强度又会增大。由此说明，偏高岭土协同石灰可以更加有效地抑制红黏土收缩效应，提高其整体强度。究其原因，是偏高岭土含有大量无定形硅、铝氧化物，且呈现边-面“搭接”的独特结构形态，使其能够快速捕获氢氧化钙溶液中的钙离子，在红黏土团（颗）粒间形成了胶结性水化物。

Abstract

The laterite is prone to shrinkage and crack due to dehydration

which may result numerous engineering disasters. Lime (5%) and meta-kaolin (4%) were added into laterite for mitigating their shrinkage behavior through improving moisture sensitivity. The samples were compacted at optimal water content and cured for 180 days. And then

samples were vacuumed and saturated immediately. After that

the saturated samples were dehydrated to predetermined moisture content for conducting a series of tests such as shrinkage

unconfined compressive strength

suction and pore analysis. The results showed that compressive strength of laterite increased at first and then decreased with moisture content reducing

which may be caused by micro-cracks derived ascribing to dehumidification. However

the strength of laterite adding with lime

especially lime and meat-kaolinite mixture

would increase with approaching to dry status

even if which has a slight reduction during drying process. This proved that meta-kaolin and lime were able to inhibit the shrinkage effect of laterite

and increase their overall strength. This may be ascribed to the following reasons

meta-kaolin contains lots of amorphous silicon and aluminum oxides and has an edge-surface contacted structure

both enable meta-kaolin to quickly capture calcium ions in calcium hydroxide solution and form cementation hydrates between grains or particles of laterite.

关键词

Keywords

references

Views

261

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Pore size evolution of compacted laterite under desiccation shrinkage process effects

Shrinkage behavior responses to nano-silica filling pores in aggregate laterite

Swelling pressure and mesomechanism of compacted laterite under constant volume condition

Discussion on some fundamental problems in unsaturated soil mechanics

Constitutive model for unsaturated clays considering temperature effects

Related Author

TAN Yun-zhi

YU Bo

LIU Xiao-ling

WAN Zhi

WANG Hong-xing

TAN Yun-zhi

WANG Yuan

ZHAN Shao-hu

Related Institution

College of Civil Engineering and Architecture, China Three Gorges University

Hunan Communications Research Institute

Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University

Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University

School of Civil Engineering, Beijing Jiaotong University

AI问答

⁰