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Impact of the Effort of a Reinforced Concrete Element on the Results of the Reinforcement Corrosion Risk Tested Using the Galvanostatic Pulse Method

100%

Raczkiewicz W. , Wójcicki A.

tom Vol. 18, no 4

33-41

Diagnostics of existing buildings includes, among others research to assess their durability. In the case of reinforced concrete structures, such tests include semi-destructive electrochemical tests to forecast the corrosion risk of steel bars in concrete, and one of the methods used is the electrochemical, polarizing galvanostatic pulse method. The aim of the article was to recognize the influence of element effort on the measurement results obtained with this method. For the tests, a reinforced concrete cantilever slab loaded monotonically was used. During the tests, the stationary potential and corrosion current density of the main reinforcement bars, as well as the resistivity of the concrete cover, were measured. Based on the results obtained, it was found that the level of effort on the element affects the values of the measurements performed. Differences in the values of measured parameters at different levels of element effort are sometimes so large that they may significantly affect the conclusions about the corrosion risk of the tested reinforcement, and thus incorrectly estimate the durability of the tested element.

The durability prediction of deteriorating reinforced concrete members

72%

Lukoseviciene O. , Kudzys A.

tom z. 53 [265]

109-118

The features of durability prediction and concepts of time-dependent reliability analysis of deteriorating reinforced concrete structures subjected to extreme gravity and lateral actions as rectangular pulse renewal processes are discussed. New methodological approaches to a time-dependent survival probability analysis and durability prediction of reinforced concrete members are considered. The safety margin of particular members is modeled as a random finite sequence. The effect of coincident recurrent extreme actions on their survival probabilities is analyzed. The instantaneous and long-term survival probabilities of particular and structural members of deteriorating structures are considered. It is recommended to calculate these probabilities by the unsophisticated analytical method of transformed conditional probabilities. The technical service life as a quantitative durability parameter of deteriorating structural members is studied.

Ocena trwałości zapraw do murów

58%

Najduchowska M.

tom R. 8, nr 23

49--60

Obecnie do oceny mrozoodporności zapraw murarskich i tynkarskich w Polsce stosuje się wycofaną normę PN-85/B-04500, jednak wydaje się, że sposób postępowania przy przygotowaniu próbek do badań powinien ulec modyfikacji. Podczas badań trwałości zapraw do murów zauważono, że niejednokrotnie sposób przygotowania próbek do badań może wpływać na uzyskane wyniki mrozoodporności zapraw. Problem ten dotyczy zarówno przygotowania w odpowiednich formach, zagęszczania, sezonowania, jak i suszenia próbek do badań. Wielokrotnie w praktyce laboratoryjnej Zakładu okazywało się, że próbki ulegały zniszczeniu przed poddaniem ich cyklom zamrażania-rozmrażania. W artykule przedstawiono wyniki badań mrozoodporności próbek zapraw przygotowanych i sezonowanych według różnych wariantów.

Currently in Poland for assessment of the freeze-thaw resistance of the masonry and plastering mortars still withdrawn PN-85/B-04500 standard is applied. However, it seems that the proceeding during the preparation of the samples should be modified. In this connection, the durability tests were conducted. It has been noticed that the way of the sample preparation can clearly affect the obtained freeze–thaw mortar resistance results. It is complex issue related to sample preparation in the appropriated moulds, curing and drying processes as well. Repeatedly in laboratory practice it turns out that durability of the samples deteriorates even before taking proceeding of the freeze-thaw cycling. In this study the results of the freeze-thaw mortar resistance test are covered. The mortar samples were prepared and cured according to different approaches.

Wpływ jakości wykonania współczesnych elewacyjnych detali architektonicznych na trwałość i bezpieczeństwo użytkowania obiektu

58%

Stawiski B.

tom R. 82, nr 4 dod.

212-215