经高温烧结处理的淤泥质土的微观结构

王宜庆; 易南概; 崔春义; 郝宪豪; 张栋

doi:10.16411/j.cnki.issn1006-7736.2019.02.014

大连海事大学学报 >

2019 , Vol. 45 >Issue 2: 101 - 107

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2019.02.014

交通运输工程

经高温烧结处理的淤泥质土的微观结构

王宜庆 ,
易南概 ,
崔春义 ,
郝宪豪 ,
张栋

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(大连海事大学交通运输工程学院，辽宁大连 116026)

王宜庆（1993 — ），男，硕士生，E-mail：Iwangyiqing@163.com.

收稿日期: 2018-10-26

修回日期: 2018-12-24

网络出版日期: 2018-12-24

基金资助

中央高校基本科研业务费专项资金资助项目(3132014326).

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Microstructure of muddy soil treated by high temperature sintering

WANG Yi-qing ,
YI Nan-gai ,
CUI Chun-yi ,
HAO Xian-hao ,
ZHANG Dong

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（Transportation Engineering College,Dalian Maritime University, Dalian 116026, China）

Received date: 2018-10-26

Revised date: 2018-12-24

Online published: 2018-12-24

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摘要

为确定经高温烧结处理的淤泥质土抗压强度变化的微观机理，借助SEM和XRD技术进行淤泥质土烧结前后微观结构和化学成分变化研究.结果表明：在高温烧结过程中，淤泥质土的成分要素和结构要素产生调整，使得土体中化学成分和微观结构随加热温度的升高发生不可逆转的变化；高温烧结后淤泥质土矿物成分发生转变，并且伴有混晶和三元共熔化合物的出现，使土体颗粒的接触状态、颗粒大小和联结形式等微观结构发生改变；烧结温度达700℃以上时，土体颗粒在共熔化合物的胶结作用下形成大体积的土体骨架，微观结构由最初的蜂窝状结构变为块状结构，土体结构的整体性提高进而使抗压强度增强.

关键词： 淤泥质土; 高温烧结; 微观结构; 扫描电镜

本文引用格式

王宜庆 , 易南概 , 崔春义 , 郝宪豪 , 张栋 . 经高温烧结处理的淤泥质土的微观结构[J]. 大连海事大学学报, 2019 , 45(2) : 101 -107 . DOI: 10.16411/j.cnki.issn1006-7736.2019.02.014

Abstract

In order to determine the microcosmic mechanism of compressive strength change of muddy soil treated by high temperature sintering, the microstructure and chemical composition of muddy soil before and after sintering were studied by using SEM and XRD. Results show that the composition and structure elements of muddy soil are adjusted in the high temperature sintering process, which result in irreversibly change of chemical composition and microstructure of soil with the increase of heating temperature. After high temperature sintering, the mineral composition of muddy soil changes accompanied by the appearance of mixed crystals and ternary eutectic compounds, which changes the contact state, particle size and bonding form of soil particles. When the sintering temperature reaches above 700℃, the soil particles form a large volume of soil skeleton under the cementation of eutectic compounds, and the microstructure changes from honeycomb structure to block structure, and the integrity of soil structure improves, so as to enhances the compressive strength.

Key words： muddy soil; high temperature sintering; microstructure; scanning electron microscope(SEM)

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