Szczegóły publikacji
Opis bibliograficzny
Enhanced autogenous self-healing of cement-based composites with mechanically activated fluidized-bed combustion fly ash / Kamil TOMCZAK, Jacek JAKUBOWSKI, Łukasz KOTWICA // Construction and Building Materials ; ISSN 0950-0618. — 2021 — vol. 300 art. no. 124028, s. 1-17. — Bibliogr. s. 16-17, Abstr. — Publikacja dostępna online od: 2021-06-16
Autorzy (3)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 135216 |
|---|---|
| Data dodania do BaDAP | 2021-07-14 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.conbuildmat.2021.124028 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Construction and Building Materials |
Abstract
This study investigates the effect of the modification of cement-based composites with mechanically activated fly ash from lignite combustion in fluidized bed boilers (MAFBC fly ash) on self-healing. The subject of the research was mortar samples in which, after 28 days of maturing, cracks 0 to 750 µm wide were mechanically induced, followed by curing for 152 days. Via computer processing and analysis of high-resolution scanner (HRS) images, the maximum average crack width reduction was determined to be 43%. The analysis of samples via ultrasonic pulse velocity (UPV) measurements estimated the degree of crack filling with newly formed material during self-sealing to be as high as 58%. In terms of mechanical properties, a maximum flexural strength recovery of 54% was observed due to microstructural changes in the contact area between the cement matrix and polypropylene fibers. To examine self-healing at a microstructural level, optical and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) were applied to the surface of cracks and fragments cut out of the samples. The results showed that the use of MAFBC fly ash as a partial substitute for cement led to the modification of the products of self-healing. Hydrated calcium aluminates were observed in the cracks in addition to typical self-healing products. In the interior of the samples, the complete filling of cracks up to a width of 110 µm was observed.
