Water absorption of recycled aggregates: Measurements, influence of temperature and practical consequences
| العنوان: | Water absorption of recycled aggregates: Measurements, influence of temperature and practical consequences |
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| المؤلفون: | Nicolas Roussel, Florian Théréné, Pascal Boustingorry, Emmanuel Keita, Laurent Bonafous, Jennifer Nael-Redolfi |
| المساهمون: | Laboratoire Navier (NAVIER UMR 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel, Chryso |
| المصدر: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2020, 137, pp.106196. ⟨10.1016/j.cemconres.2020.106196⟩ |
| بيانات النشر: | Elsevier BV, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Cement, Ettringite, Absorption of water, Materials science, 0211 other engineering and technologies, Humidity, 02 engineering and technology, Building and Construction, 021001 nanoscience & nanotechnology, medicine.disease, 6. Clean water, [SPI]Engineering Sciences [physics], [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, chemistry.chemical_compound, chemistry, Chemical engineering, 021105 building & construction, Highly porous, medicine, General Materials Science, Dehydration, 0210 nano-technology, Porosity, Absorption (electromagnetic radiation) |
| الوصف: | International audience; 13 Recycled Concrete Aggregates are highly porous and may therefore absorb more water 14 than natural aggregates. Several methods allow for the measurement of water 15 absorption requiring drying at temperature above ambient conditions. We show here 16 that, for temperatures above the ambient temperature (> 30°C) and at low relative 17 humidity, the drying of recycled aggregates removes some bounded water contained in 18 hardened cement paste and increases both measured porosity and water absorption. 19 Porosity and XRD suggest that porosity increases due to ettringite dehydration. Thus, 20 the drying step required to characterize recycled aggregates leads to a systematic 21 overestimation of the water absorption. Moreover, this overestimation induces an error 22 in mix-design leading to a higher effective water/cement ratio. If absorption and water 23 content are measured with the same preparation protocol, correction is not needed. We 24 finally propose a correction method for the water absorption measured according to the 25 standard protocol (drying at 105°C). |
| تدمد: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2020.106196 |
| DOI: | 10.1016/j.cemconres.2020.106196⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::349942ea87358bc458606f1f6afb7381 https://doi.org/10.1016/j.cemconres.2020.106196 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....349942ea87358bc458606f1f6afb7381 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00088846 |
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| DOI: | 10.1016/j.cemconres.2020.106196 |