Sorption of products of radiolysis of superplasticizers on hardened cement paste

IF 1.8 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2025-09-11 DOI:10.1016/j.apradiso.2025.112181

Marko Štrok , Tamara Bizjak , David Heath , Ester Heath

引用次数: 0

Abstract

Polyethylene glycol (PEG) has been identified as a radiolytical degradation product of polycarboxylate ether (PCE) superplasticizers, which are used to improve the workability of cement, including in the facilities and structures for disposal of radioactive waste. PEG can complex radionuclides and occupy sorption sites on the cement, altering their behaviour in a cementitious environment. This study quantifies PEG sorption on two hardened cement paste samples of cement type CEM I at degradation stages II and III. Results show higher K_d values for lower initial concentrations of PEG, indicating the presence of sorption sites with different affinities for PEG in hardened cement paste samples, while the estimated maximum PEG production from the degradation of PCE superplasticizers shows that there is potentially an order of magnitude more PEG available in the cement that can be sorbed.

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高效减水剂在硬化水泥浆体上的辐射分解产物的吸附

聚乙二醇（PEG）已被确定为聚羧酸醚（PCE）高效减水剂的放射性降解产物，用于改善水泥的可加工性，包括用于处理放射性废物的设施和结构。聚乙二醇可以使放射性核素复合并占据水泥上的吸附位点，改变其在胶凝环境中的行为。本研究量化了两种水泥型CEM I硬化水泥浆样在降解阶段II和III的PEG吸附。结果表明，初始PEG浓度越低，Kd值越高，这表明硬化水泥膏体样品中存在对PEG具有不同亲和力的吸附位点，而PCE高效减水剂降解产生的最大PEG表明，水泥中可吸附的PEG可能会增加一个数量级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.