Roman Jaskulski, Ph.D., Eng.


Doctoral thesis
2005-06-30Wpływ wybranych założeń obliczeniowych na zapas bezpieczeństwa zginanych i ściskanych żelbetowych elementów prętowych, wyznaczany metoda Monte Carlo  (PW)
supervisor -- Jan Pawlikowski, Ph.D., Dr. Habil., Eng., PW
1316 
Recent publications
1.Jóźwiak-Niedźwiedzka D., Jaskulski R., Glinicki M.A., Application of Image Analysis to Identify Quartz Grains in Heavy Aggregates Susceptible to ASR in Radiation Shielding Concrete, Materials, ISSN: 1996-1944, DOI: 10.3390/ma9040224, Vol.9, No.4, pp.224-1-14, 2016
Abstract:

Alkali-silica reaction (ASR) is considered as a potential aging-related degradation phenomenon that might impair the durability of concrete in nuclear containments. The objective of this paper is the application of digital analysis of microscopic images to identify the content and size of quartz grains in heavy mineral aggregates. The range of investigation covered magnetite and hematite aggregates, known as good absorbers of gamma radiation. Image acquisition was performed using thin sections observed in transmitted cross-polarized light with λ plate. Image processing, consisting of identification of ferrum oxide and epoxy resin, and the subsequent application of a set of filtering operations resulted in an adequate image reduction allowing the grain size analysis. Quartz grains were classified according to their mean diameter so as to identify the reactive range. Accelerated mortar bar tests were performed to evaluate the ASR potential of the aggregates. The SiO2 content in the heavyweight aggregates determined using the image analysis of thin sections was similar to XRF test result. The content of reactive quartz hematite was 2.7%, suggesting that it would be prone to ASR. The expansion test, according to ASTM C1260, confirmed the prediction obtained using the digital image analysis.

Keywords:

alkali-silica reaction, grain size, heavyweight aggregate, image analysis, radiation shielding concrete, reactive aggregate, quartz

Affiliations:
Jóźwiak-Niedźwiedzka D.-IPPT PAN
Jaskulski R.-IPPT PAN
Glinicki M.A.-IPPT PAN
2.Glinicki M.A., Jaskulski R., Dąbrowski M., Design principles and testing of internal frost resistance of concrete for road structures – critical review, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.016.002, Vol.15, No.1, pp.21-43, 2016
Abstract:

We present a review of freeze-thaw durability requirements laid down in both European standards and in the national specifications in relation to concrete for road structures. The principles of material selection for concrete mix are presented. We discuss local variations in the severity of the winter season and the extent of frost action in the components of road structures. The characteristic parameters of the test procedure for direct assessment of the resistance of concrete to internal damage are analysed, with particular attention paid to the specimen cooling rate. The temperature distribution in specimens was determined in standard freeze-thaw resistance tests carried out at two accredited laboratories. We discuss the criteria used in indirect assessment of freeze-thaw durability of air-entrained concrete on the basis of air void characteristics. Based on the determined temperature distribution in concrete specimens we postulate an improvement of the standard test procedure to clearly specify the cooling rate. It would be beneficial to distinguish frost impact zones depending on the severity of action of frost and de-icing salts on concrete in road structures.

Keywords:

air void characteristics, concrete, cooling rate, durability, internal frost resistance, mix design, performance specification, test methods

Affiliations:
Glinicki M.A.-IPPT PAN
Jaskulski R.-IPPT PAN
Dąbrowski M.-IPPT PAN
3.Jaskulski R., Glinicki M.A., Dąbrowski M., Ranachowski Z., Sobczak M., Monitorowanie parametrów termicznych procesu twardnienia betonów osłonowych, Journal of Civil Engineering, Environment and Architecture, ISSN: 2300-5130, DOI: 10.7862/rb.2016.14, Vol.XXXIII, No.63 (1/I/2016), pp.123-132, 2016
Abstract:

W artykule przedstawiono wyniki badań parametrów termicznych procesu twardnienia mieszanek betonowych, z których dwie wykonano z wykorzystaniem kruszyw stosowanych w produkcji betonów osłonowych (kruszywo magnetytowe oraz serpentynitowe), a trzecią, referencyjną, z wykorzystaniem kruszywa amfibolitowego. Na podstawie analizy dokonanych pomiarów temperatury wyznaczono parametry procesu twardnienia betonu (m.in. maksymalny przyrost temperatury, maksymalny gradient i in.). Jednocześnie rozwiązując numerycznie tzw. zagadnie-nie odwrotne wyznaczono parametry cieplne betonu w trakcie pierwszych 72 godzin twardnienia. Tą samą metodą wyznaczono również wartości funkcji źródła ciepła, a następnie na jej podstawie oszacowano ilość ciepła wydzieloną w procesie hydratacji cementu. Uzyskano dobrą jakościową zgodność postaci funkcji źródła ciepła oraz wykresów zmian temperatury w mieszankach. W toku analiz uzyskanych wyników wyraźnie zaznaczył się wpływ zróżnicowania parametrów cieplnych zastosowanych kruszyw. W przypadku mieszanki z kruszywem serpentynitowym dały się także zauważyć istotne różnice w przebiegu przyrostu temperatury (opóźnienie) w stosunku do pozostałych mieszanek

Keywords:

młody beton, beton osłonowy, ciepło hydratacji, ciepło właściwe, współczynnik przewodzenia ciepła

Affiliations:
Jaskulski R.-IPPT PAN
Glinicki M.A.-IPPT PAN
Dąbrowski M.-IPPT PAN
Ranachowski Z.-IPPT PAN
Sobczak M.-IPPT PAN

Conference papers
1.Glinicki M.A., Jaskulski R., Dąbrowski M., Ranachowski Z., Determination of Thermal Properties of Hardening Concrete for Massive Nuclear Shielding Structures, SCMT4, 4th International Conference on Sustainable Construction Materials and Technologies, 2016-08-07/08-11, Las Vegas (US), pp.1-9, 2016
Abstract:

Nuclear reactor containments must maintain high durability since they restrict the spread of radiation and radioactive contamination to the general public, which could have significant consequences. The containment integrity and impermeability for potentially contaminated media is ensured using sophisticated structural and materials solutions including prevention of early age cracking of concrete. The results of numerical and experimental investigation on thermal behavior of early age concrete are presented. Concrete mixes were prepared with low-heat blended cements and various mineral aggregates. Special aggregates were selected for enhancing the radiation shielding capacity of concrete, including minerals of high atomic weight and of increased content of bound water. The proposed approach consisted of several stages, consisting mainly of measurements of the one-dimensional heat distribution in cylindrical concrete elements and solving the equation of one-dimensional heat transferto determine thermal properties of hardening concrete. The proposed model of temperature distribution in hardening concrete is based on the non-linear inverse heat transfer problem solution. The obtained experimental results and numerically determined material characteristics are discussed in respect to the concrete mix design.

Keywords:

durability, heat transfer, hardening concrete, inverse solution, temperature, thermal properties

Affiliations:
Glinicki M.A.-IPPT PAN
Jaskulski R.-IPPT PAN
Dąbrowski M.-IPPT PAN
Ranachowski Z.-IPPT PAN
2.Jóźwiak-Niedźwiedzka D., Glinicki M.A., Gibas K., Jaskulski R., Denis P., Garbacik A., Alkali-silica expansion of heavy aggregates used for nuclear shielding concrete, BMC-11, 11th International Symposium on Brittle Matrix Composites, 2015-09-28/09-30, Warsaw (PL), pp.353-360, 2015
Abstract:

In the present study the potential appearance of the alkali-silica reaction (ASR) in heavy aggregates was studied. ASTM C1260 Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method) was applied. In order to investigate the effect of the content of alkalies in cement on the expansions due to ASR, three levels of total and soluble alkali content of cement were studied. Three portland cements Type I with different alkali content were selected. Two ordinary portland cements, which are commonly available in the market and one special cement were tested. That cement was specially made for the purpose of the nuclear shielding concrete CEM I NA-SR-LH of low-alkali, increased sulphate resistance and low heat of hydration. For the tests according to ASTM C 1260 the high-density aggregates, known as absorbing gamma radiation were selected: barite, magnetite and hematite. The expansion test revealed that hematite was highly reactive, regardless of the type of cement. Already after four days of storage in 1 N NaOH and 80°C the mortar bar expansion exceeded the limit of 0.1%, and after next four days was more than 0.2%., which qualifies it extremely reactive aggregate. Other aggregates after 14 days of testing did not exceed 0.1% elongation limit, but the influence of the type of cement was noticed. There was a noticeable tendency for increasing the total expansion with increasing the alkali content of cement.

Keywords:

Alkali-Silica Reaction (ASR), high density aggregate, cement composition

Affiliations:
Jóźwiak-Niedźwiedzka D.-IPPT PAN
Glinicki M.A.-IPPT PAN
Gibas K.-IPPT PAN
Jaskulski R.-IPPT PAN
Denis P.-IPPT PAN
Garbacik A.-Institute of Ceramics and Building Materials (PL)
3.Glinicki M.A., Jaskulski R., Pichór W., Dąbrowski M., Sobczak M., Investigation of thermal properties of shielding concrete, BMC-11, 11th International Symposium on Brittle Matrix Composites, 2015-09-28/09-30, Warsaw (PL), pp.371-380, 2015
Abstract:

The paper presents the results of investigation of the specific heat and the thermal conductivity of shielding concrete and the specific heat of selected crushed aggregates used to produce them. The results of the specific heat were obtained by two methods: a stationary method, using a calorimeter, and a non-stationary method. The obtained results were compared to the results available in the literature. In addition, in the case of measuring the specific heat, the results obtained with the two methods were compared and attempt has been made to explain the differences between them.

Keywords:

shielding concrete, heavy aggregates, specific heat, thermal conductivity

Affiliations:
Glinicki M.A.-IPPT PAN
Jaskulski R.-IPPT PAN
Pichór W.-other affiliation
Dąbrowski M.-IPPT PAN
Sobczak M.-IPPT PAN

Conference abstracts
1.Długosz A., Pokorska I., Glinicki M.A., Jaskulski R., Identification of thermal properties of hardening concrete by means of evolutionary algorithms, ECCOMAS - IPM 2017, 4th International Conference on Inverse Problems in Mechanics of Structures and Materials, 2017-05-31/06-02, Rzeszów - Krasiczyn (PL), pp.17-18, 2017