含Cs、Sr、U模拟核素的地质水泥固化体热稳定性研究

桑培伦; 谢华; 苏伟; 王烈林; 王文文; 冯志强

doi:10.11889/j.0253-3219.2018.hjs.41.020603

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含Cs、Sr、U模拟核素的地质水泥固化体热稳定性研究

核能科学与工程 | 更新时间：2021-05-19

- 含Cs、Sr、U模拟核素的地质水泥固化体热稳定性研究
- Thermal stability of geological cement waste forms containing Cs, Sr and U simulated nuclide
- 核技术 2018年41卷第2期文章编号：020603
- 作者机构：
  
  1.中国工程物理研究院材料研究所绵阳 621907
  2.核废物与环境安全国防重点学科实验室绵阳 621900
- 作者简介：
  
  [ "桑培伦, 女, 1987年出生, 2012年毕业于中南大学, 现为硕士研究生, 研究领域为核废物处理技术研究与开发", "SANG Peilun, female, born in 1987, graduated from Central South University in 2012, master student, focusing on research and development of nuclear waste treatment technology" ]
  谢华, E-mail:xiehua@swust.edu.cn, xiehua79@hotmail.comXIE Hua, E-mail: xiehua@swust.edu.cn; xiehua79@hotmail.com
- 基金信息：
  
  中国工程物理研究院基金(FKY201402);中国工程物理研究院横向项目(16zx7127)
- DOI：10.11889/j.0253-3219.2018.hjs.41.020603
  中图分类号： TL941.111
- 收稿日期：2017-10-24，
  
  修回日期：2017-12-03，
  
  纸质出版日期：2018-02-10
- 稿件说明：
移动端阅览
桑培伦, 谢华, 苏伟, 等. 含Cs、Sr、U模拟核素的地质水泥固化体热稳定性研究[J]. 核技术, 2018,41(2):020603

Peilun SANG, Hua XIE, Wei SU, et al. Thermal stability of geological cement waste forms containing Cs, Sr and U simulated nuclide[J]. Nuclear techniques, 2018, 41(2): 020603
桑培伦, 谢华, 苏伟, 等. 含Cs、Sr、U模拟核素的地质水泥固化体热稳定性研究[J]. 核技术, 2018,41(2):020603 DOI： 10.11889/j.0253-3219.2018.hjs.41.020603.

Peilun SANG, Hua XIE, Wei SU, et al. Thermal stability of geological cement waste forms containing Cs, Sr and U simulated nuclide[J]. Nuclear techniques, 2018, 41(2): 020603 DOI： 10.11889/j.0253-3219.2018.hjs.41.020603.

摘要

分别针对包含Cs、Sr、U模拟核素的地质水泥固化体，以热处理温度为变量，通过考察固化体热处理前后质量、体积、抗压强度以及物相等参量的变化规律，以此评价地质水泥的热稳定性。实验结果表明，当

≤300℃时，三类水泥固化体的外观无明显变化，体积收缩率控制在3%以下，抗压强度损失率低于25%，仅部分水化产物脱水引起较大失重，体现为显微结构中针状、网状特征组织减少，孔隙增加；当

＞700℃时，水泥外表面出现明显裂纹，水化产物已完全相变，但结构仍未见崩塌，显微组织变得更加致密并具有陶瓷结构特征，导致抗压强度随温度升高反向增大，展现出良好的高温热稳定性。新生成的硅灰石相Ca

发生同素异构转变是导致固化体表面开裂的主要原因。

Abstract

Background

The thermal stability of geological cement waste forms containing high pyrolysis products such as Sr and Cs

is an important index for performance evaluation of the nuclear waste solidified body.

Purpose

This paper aims to evaluate the thermal stability of geological cement waste forms.

Methods

Cement waste forms containing Sr

Cs and U were prepared. The changes of mass

volume

compressive strength and other parameters for cement waste forms were observed after heat treatment at different temperatures

and the phase and structure of the samples were analyzed by means of X-ray diffraction (XRD) and scanning electron microscope (SEM).

Results

The experimental results showed that when

≤ 300 degree Celsius

the appearance of the three kinds of cement waste forms had no obvious change; volume shrinkage and the compressive strength loss rate were less than 3% and 25%

respectively. Only part of the hydration product dehydration caused a greater weight loss

corresponding to the decrease of the needle

reticular characteristic organization and the increase of porosity in microstructure. When

700 degree Celsius

the cement surfaces had many significant cracks and hydration products had complete phase change

but the structure had not yet collapsed; the microstructure became more dense and had ceramic structural features

which resulted in a compressive strength increasing inversely with temperature

exhibiting good thermal stability at high temperature. The formation of the newly wollastonite phase Ca

was the main reason for the surface cracking of the geological cement waste forms.

Conclusion

Compared with ordinary Portland cement (OPC) and alkali activated cement (AAC) cement waste forms

the geological cement waste forms have better thermal stability.

关键词

Keywords

references

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