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Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

Tytuł artykułu

Badanie wpływu warstwy przejściowej starego i nowego betonu na odporność betonu na pękanie

Autorzy Kubiszyn, J. 
Treść / Zawartość
Warianty tytułu
EN 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 PL
EN 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.
Słowa kluczowe
PL warstwa przejściowa   beton stary   beton nowy   odporność na pękanie   mechanika pękania  
EN interfacial transition zone   old concrete   new concrete   fracture toughness   fracture mechanics  
Wydawca Oficyna Wydawnicza Politechniki Rzeszowskiej
Czasopismo Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
Rocznik 2000
Tom z. 32[180], cz.1
Strony 311--318
Opis fizyczny Bibliogr. 7 poz., il.
autor Kubiszyn, J.
  • Politechnika Rzeszowska, Wydział Budownictwa i Inżynierii Środowiska
Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-article-BTB2-0049-0069