Academic Journal
Improving the frost resistance of roof tiles beyond current prediction schemes
| العنوان: | Improving the frost resistance of roof tiles beyond current prediction schemes |
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| المؤلفون: | Chiara Zanelli, Dircetti Girolamo, Conte Sonia, Molinari Chiara, Dondi Michele |
| المصدر: | Open Ceramics, Vol 10, Iss , Pp 100249- (2022) |
| بيانات النشر: | Elsevier, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Clay industries. Ceramics. Glass |
| مصطلحات موضوعية: | Durability, Frost resistance, Mechanical strength, Pore size distribution, Roof tile, Clay industries. Ceramics. Glass, TP785-869 |
| الوصف: | Frost resistance is an important requirement for clay roof tiles and the most difficult to keep under control during industrial production. Durability under freeze/thaw cycles is related with the capillary pore system, and current models predict the lower the open porosity and the coarser the pore size, the better the frost resistance. This implies, however, high firing temperature and rather refractory clay bodies, which are in contrast with energy and resource efficiency. Therefore, a different approach is needed to improve frost resistance of roof tiles without stressing the concept of low porosity and coarse pore size. A case-study is presented to demonstrate how excellent frost resistance can be achieved by adjusting raw materials formulation and firing schedule. Raw materials and bodies were characterized by XRF, ASTM C958 and technological properties. Both laboratory tests were performed: the products were characterized by water absorption (ASTM C67), open porosity and pore size distribution (Hg porosimetry), phase composition (XRD-Rietveld), mechanical strength (EN 538) and frost resistance (EN 539-2) up to 400 freeze/thaw cycles. Durability of roof tiles was drastically improved acting on both pore size distribution (eliminating pores 13 MPa). Phase composition plays a complex role with opposite effects of new formed phases versus amorphous phase and residual clay minerals. A satisfactory target (no damages after 250 freeze/thaw cycles) was achieved firing at 900 °C (7% pores |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2666-5395 41249291 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S2666539522000323; https://doaj.org/toc/2666-5395 |
| DOI: | 10.1016/j.oceram.2022.100249 |
| URL الوصول: | https://doaj.org/article/44fe07fb8f6b41249291d6e9751237b6 |
| رقم الانضمام: | edsdoj.44fe07fb8f6b41249291d6e9751237b6 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 26665395 41249291 |
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| DOI: | 10.1016/j.oceram.2022.100249 |