New Approach for the Determination of Radiological Parameters on Hardened Cement Pastes with Coal Fly Ash
| العنوان: | New Approach for the Determination of Radiological Parameters on Hardened Cement Pastes with Coal Fly Ash |
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| المؤلفون: | M.M. Alonso, J. A. Suárez-Navarro, Ana María Moreno de los Reyes, Isabel Sobrados, C. Gascó, Francisca Puertas |
| المساهمون: | European Commission, Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España) |
| المصدر: | Materials Volume 14 Issue 3 Materials, Vol 14, Iss 475, p 475 (2021) Digital.CSIC. Repositorio Institucional del CSIC instname Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) |
| بيانات النشر: | Multidisciplinary Digital Publishing Institute, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Portland cement, gamma-ray spectrometry, Characterization, 0211 other engineering and technologies, Fly ash, 02 engineering and technology, 010403 inorganic & nuclear chemistry, 01 natural sciences, lcsh:Technology, NORM wastes, Article, Industrial waste, law.invention, law, 021105 building & construction, General Materials Science, characterization, lcsh:Microscopy, lcsh:QC120-168.85, Cement, Radionuclide, lcsh:QH201-278.5, lcsh:T, Metallurgy, SCMs, Radioactive waste, Gamma-ray spectrometry, 0104 chemical sciences, fly ash, lcsh:TA1-2040, lcsh:Descriptive and experimental mechanics, Cementitious, lcsh:Electrical engineering. Electronics. Nuclear engineering, Mortar, lcsh:Engineering (General). Civil engineering (General), lcsh:TK1-9971 |
| الوصف: | Supplementary cementitious materials (SCMs) in industrial waste and by-products are routinely used to mitigate the adverse environmental effects of, and lower the energy consumption associated with, ordinary Portland cement (OPC) manufacture. Many such SCMs, such as type F coal fly ash (FA), are naturally occurring radioactive materials (NORMs). 226Ra, 232Th and 40K radionuclide activity concentration, information needed to determine what is known as the gamma-ray activity concentration index (ACI), is normally collected from ground cement samples. The present study aims to validate a new method for calculating the ACI from measurements made on unground 5 cm cubic specimens. Mechanical, mineralogical and radiological characterisation of 28-day OPC + FA pastes (bearing up to 30 wt % FA) were characterised to determine their mechanical, mineralogical and radiological properties. The activity concentrations found for 226Ra, 212Pb, 232Th and 40K in hardened, intact 5 cm cubic specimens were also statistically equal to the theoretically calculated values and to the same materials when ground to a powder. These findings consequently validated the new method. The possibility of determining the activity concentrations needed to establish the ACI for cement-based materials on unground samples introduces a new field of radiological research on actual cement, mortar and concrete materials. This study was funded by the Spanish Minister Science and Innovation and Spanish State Investigation Agency and the European Regional Development Fund (AEI/FEDER/EU) under research project BIA2016-77252-P. Ana María Moreno de los Reyes participated in the study under Spanish Research Agency pre-doctoral grant BES-2017-081306. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1996-1944 2016-7725 |
| DOI: | 10.3390/ma14030475 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e131daa503b102a78359adfb9ec9798d |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....e131daa503b102a78359adfb9ec9798d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19961944 20167725 |
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| DOI: | 10.3390/ma14030475 |