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[1]茆忠阳,邓敏.白云岩粉末压实体碱白云石反应的膨胀应力[J].南京工业大学学报(自然科学版),2019,41(03):300-305.[doi:10.3969/j.issn.1671-7627.2019.03.005]
 MAO Zhongyang,DENG Min.Expansion stress of powdered dolostone compacts in alkali-dolomite reaction[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2019,41(03):300-305.[doi:10.3969/j.issn.1671-7627.2019.03.005]
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白云岩粉末压实体碱白云石反应的膨胀应力()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
41
期数:
2019年03期
页码:
300-305
栏目:
出版日期:
2019-05-28

文章信息/Info

Title:
Expansion stress of powdered dolostone compacts in alkali-dolomite reaction
文章编号:
1671-7627(2019)03-0300-06
作者:
茆忠阳邓敏
南京工业大学 材料科学与工程学院 材料化学工程国家重点实验室,江苏 南京 211800
Author(s):
MAO ZhongyangDENG Min
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China
关键词:
白云岩粉末 压实体 膨胀应力测定 去白云石化反应 碱白云石反应
Keywords:
dolomite powder compacts swelling stress measurement dedolomitization reaction alkali-dolomite reaction
分类号:
TU528.01
DOI:
10.3969/j.issn.1671-7627.2019.03.005
文献标志码:
A
摘要:
采用自制膨胀应力测定仪对白云岩粉末压实体的碱白云石反应(ADR)膨胀应力进行直接测定。结果表明:白云岩粉末压实体与碱发生去白云石化反应可以产生膨胀应力,膨胀应力可以达到103 MPa。白云岩粉末压实体发生去白云石化反应产生的膨胀应力趋势相同,即变化过程可分为3个阶段:平缓阶段、缓慢增加阶段和快速增加阶段。在养护过程中,受限的白云岩粉末压实体内的白云石发生去白云石化反应,生成细小的方解石和水镁石。这些产物在受限的孔隙和间隙里沿白云石边缘生长并形成搭接框架后,继续生长引起白云岩粉末压实体缓慢产生膨胀应力。
Abstract:
The expansion stress of powdered dolostone compacts in alkali dolomite reaction(ADR)was measured directly by self-made expansion stress measuring instrument. Results showed that the dedolomitization reaction between the powdered dolostone compacts and alkali could produce expansion stress, which could reach more than 100 MPa. The variation of the expansion stress curve with time had similar trend, and could be divided into three segments of the expansion stress remained flat value, increased slowly and increased quickly. In the flat segment, the dolomite in compacts interacted with the NaOH from the pore solution to form fine intergrowth of calcite and brucite. The brucite and calcite filled the pores of the compacts and created new pores. When the products were grown in contact with dolomite particles and particles, a lapped framework was formed, and continued growth caused the dolostone powdered compact to slowly develop expansion stress.

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备注/Memo

备注/Memo:
收稿日期:2018-05-25
基金项目:材料化学工程国家重点实验室开放课题重点项目(ZK201302)
作者简介:茆忠阳(1993—),男,E-mail:651628945@qq.com; 邓敏(联系人),教授,E-mail:dengmin@njtech.edu.cn.
引用本文:茆忠阳,邓敏.白云岩粉末压实体去白云石化反应的膨胀应力[J].南京工业大学学报(自然科学版),2019,41(3):300-305..
更新日期/Last Update: 2019-05-30