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    Wyświetlanie 1-2 z 2
    Tytuł:
    Strukturalne wzmacnianie wapienia pińczowskiego polimetakrylanem butylu
    STRUCTURAL REINFORCEMENT OF PIŃCZÓW LIMESTONE WITH BUTYL POLYMETHACRYLATE
    Autorzy:
    Domasłowski, Wiesław
    Powiązania:
    https://bibliotekanauki.pl/articles/535143.pdf
    Data publikacji:
    1976
    Wydawca:
    Narodowy Instytut Dziedzictwa
    Tematy:
    żywice termoplastyczne
    strukturalne wzmacnianie kamienia
    wapień pińczowski
    polimetakrylan butylu
    wzmacnianie wapienia roztworami PMB
    Opis:
    Research aimed at elucidating the causes of m igrations of thermoplastic resins — employed as solutions for reinforcement of porous stones — has been taken up. Solutions of butyl polymethacrylate have been used for the purpose, the limestone from the region of Pińczów being saturated with them in the tests concerned. The impact exerted by the degree of polymerization of resins, solvents and concentration on capillary ascent o f solutions, the degree of saturation of the stcnes, their drying capacity and finally on the process of migration of resins in the course of drying has been studied. The results of the investigations have made it possible to determine the paramétrés chesking the process o f migration of butyl polymethacrylate to the surface of Pińczów limestone. As has been ascertained, the main cause deciding about the course of migration is viscosity of solutions. Its degree may be adjusted by way of employing polymers with a higher degree of polymerization or by enhancing concentration of the solutions. The first route has been recognized as more efefctive since it provides for multiple repetition of the proceeding by means of diluted solutions what is of great significance from the viewpoint of conservation practice. Now as regards the solvents used, the best results have been obtained in the case of white spirit. Due to the specific phenomena accompanying its evaporation, solutions with a low degree of viscosity may be applied and the effect of structural reinforcement duly achieved. If aromatic hydrocarbons used as solvents, the viscosity of the solutions should amount to 10+15 cP. On the grounds of the results obtained an attempt has been made at elucidation of the phenomena of migration what enables selection of adequate paramétrés providing for structural reinforcement of the monuments built, or made, of porous materials.
    Źródło:
    Ochrona Zabytków; 1976, 4; 285-294
    0029-8247
    Pojawia się w:
    Ochrona Zabytków
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strukturalne wzmacnianie wapienia pińczowskiego
    STRUCTURAL REINFORCEMENT OF PIŃCZÓW LIMESTONE
    Autorzy:
    Dobrowolski, Wiesław
    Sobkowiak, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/539113.pdf
    Data publikacji:
    1976
    Wydawca:
    Narodowy Instytut Dziedzictwa
    Tematy:
    wapień pińczowski
    strukturalne wzmacnianie wapienia
    metoda S.Z. Lewina
    rekrystalizacja węglanu wapnia
    Opis:
    The aim of the research was to examine the possibilities and ways of application of S. Z. Lewin’s method in limestone reinforcement. The method constists in limestone impregnation with the solution of carbamide and barium hydroxide. As a result of the chemical reaction in limestone pores the insoluble barium carbonate is precipitated; it is to play the function of the reinforcement. ' At the first stage of the research work the experiments, as described by S. Z. Lewin, were carried out. They dealt with the cementation of powdered chalk in reinforcing solution. Results of these experiments, however, proved to be a failure: after the six-month period of impregnation the cementation of limestone powder did not occur. The second stage consisted in extending the scope of the research. It included the influence of temperature and duration upon the processes of barium carbonate precipitation and limestone powder cementation as well as the effects of the duration of impregnating solution action on mechanical and physical properties of limestone. Moreover, derivatographic and X-ray structural analyses of impregnated limestone were made. As a consequence of the above experiments it was stated that the efficiency of the process of barium carbonate precipitation in room temperature was very small ((about 26 per cent after 30 days). It increases proportionally to the growth of temperature, being sufficient at 95°C. The increase of limestone strength was not stated on the grounds of influence of duration of the solution action (up to 3 months) in room temperature. Absorbing and capillary capacities of limestone, however, decreased and this proved the partial seal of limestone pores caused by barium carbonate. The application of barium hydroxide solution (free of carbamide) brought similar results. In the latter case the chemical reaction of barium hydroxide with calcium carbonate took place. The above-mentioned results were confirmed by X-ray structural investigations. It should be stressed that the cementation of limestone powder and chalk did not occur although hardening solutions of raised temperature (up to 95°C) were being used. Because of negative results of the tests carried out we cannot apply S. Z. Lewin’s method in limestone hardening. This method seems to be sufficient only for protecting the stone against the destructive components of atmosphere (chiefly S 0 2). There are two possible explanations of this situation: in his publications S. Z. Lewin did not make the conditions of limestone hardening clear enough or he might have used some additional substances which caused crystalline barium carbonate to emerge. Crystalline barium carbonate is capable of making crystalline concretions with calcite. In this case both the cementation of limestone powder and thereby reinforcing of limestone should occur.
    Źródło:
    Ochrona Zabytków; 1976, 2; 75-83
    0029-8247
    Pojawia się w:
    Ochrona Zabytków
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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