Tytuł artykułu
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Wybrane pełne teksty z tego czasopisma
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Warianty tytułu
Effect of the interfacial transition zone of old and new concrete on the fracture toughness elements
Konferencja
V Konferencja Naukowa Rzeszowsko-Lwowsko-Koszycka Aktualne problemy budownictwa i inżynierii środowiska, Rzeszów, 25-26 września 2000. Cz.1. Budownictwo
Języki publikacji
Abstrakty
The article presents a possibility of using fracture mechanics methods for investigation the effect of the contact zone of old and new concrete on the fracture toughness of concrete elements. The investigation according Mode 1 (tension at bending) was carried out on beams formed by mixing several years old concrete and new 28 days old concrete. The research work involved beams with two substantially different contact surfaces: the surface obtained due to natural fracture and the ground one. The results of fracture toughness investigations according Mode 1 using RILEM draft recommendations and guidelines contained in the ASTM STP 410 have been presented. The critical stress intensity factor K slc and K lc as well as critical crack tip opening displacement CTODc have been determined. Based on the obtained investigation results the following conclusions were drawn: *The values of the critical load PQ and those of the stress intensity factor Klc from for secondary beams with a ground contact surface were on average by 35 % lower than those for the beams with a contact zone obtained due to a natural fracture. *The values of the critical factors of stress intensity for secondary beams with natural fracture, calculated according to and were, on average, 30% lower than for the primary beams. *The value of stress intensity factors calculated according to the RELEM draft recommendation is many times as much (3 times) as the values obtained from the Brown and Srawley's formula published so far can not be treated as data of comparison but as those of only visual value. *Based on the comparison of the values of the investigated parameters, one can find out that even in laboratory conditions, where the samples were carefully prepared (cleaned and wetted before the tacking layer was put on) the contact zone of the new and old concrete was the weakest element of the tested beams.
Rocznik
Tom
Strony
311--318
Opis fizyczny
Bibliogr. 7 poz., il.
Twórcy
autor
- Politechnika Rzeszowska, Wydział Budownictwa i Inżynierii Środowiska
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BTB2-0049-0069
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