Rola nanokrzemionki w betonie zawierającym kruszywo hematytowe i magnetytowe oraz węglik boru jako osłony przed promieniowaniem gamma

• Autorzy: Safamehr Majid , Izadinia Mohsen , Hashemi Seyed Hamid , Koohestani Saeideh

Identyfikatory

DOI

10.32047/CWB.2021.26.3.4

Warianty tytułu

EN

Nanosilica role in concrete containing iron oxides aggregates and boron carbide as a shield against gamma rays

• Języki publikacji: PL EN

Abstrakty

PL

W artykule opisano wyniki badań dwóch betonów ciężkich, pierwszy zawierający kruszywo hematytowe i drugi magnetytowe. Węglik boru wprowadzono jako zamiennik cementu w ilościach 2,5; 5 i 10% masowych. Następnie w tych mieszankach ilość cementu zmniejszono o 5% i zastąpiono nanokrzemionką. Zbadano także właściwości betonu: wytrzymałość na ściskanie, szybkość przejścia fali ultradźwiękowej i gęstość, a także napromieniowano próbki kobaltem 60, w celu określenia współczynnika tłumienia liniowego. Zastosowanie kruszyw zawierających tlenek żelaza, a zwłaszcza magnetyt, było korzystne dla wszystkich wymienionych właściwości, natomiast odwrotnie było w przypadku dodania do mieszanki węglika boru. Dodatek nanokrzemionki skompensował spadek wytrzymałości betonu na ściskanie spowodowany dodatkiem węglika boru, ale zmniejszył współczynnik tłumienia liniowego o około 4%. Jednak właściwości mieszanek zawierających węglik boru i nanokrzemionkę były zawsze lepsze niż w przypadku betonów zwykłych. W celu określenia współczynnika tłumienia liniowego przeprowadzono symulacje Monte Carlo, których wyniki okazały się zgodne z wynikami uzyskanymi w trakcie badań doświadczalnych.

EN

Two families of heavy concrete were investigated in this project, the first containing hematite and the second magnetite aggregates. Boron carbide also replaced cement in mass of 2.5, 5 and 10%. Once again, in these compounds the content of cement was reduced by 5% and replaced by nanosilica. Such parameters as compressive strength, ultrasonic pulse velocity and density were investigated, and the specimens were irradiated with cobalt 60, to quantify the linear attenuation coefficient. Using iron ore aggregate, especially magnetite, was advantageous for all the above-mentioned parameters, while the opposite was true, when boron carbide was added to the mix. The addition of nanosilica compensated the decrease in compressive strength of concrete due to the presence of boron carbide, but reduced the linear attenuation coefficient by about 4%. However, the properties of the mixes containing boron carbide and nanosilica, were always better than those of conventional concretes. To quantify the linear attenuation coefficient, Monte Carlo simulations were performed, and their results turned out to be in good agreement with those obtained by the experimental measurements.

Słowa kluczowe

PL

hematyt; magnetyt; węglik boru; promienie gamma; osłona betonowa; nanokrzemionka

EN

hematite; magnetite; boron carbide; gamma rays; concrete shield; nanosilica

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2021
• Tom: R. 26, nr 3
• Strony: 218--232
• Opis fizyczny: Bibliogr. 39 poz., il., tab.

Twórcy

autor

Safamehr Majid

• Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

autor

Izadinia Mohsen

• Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

autor

Hashemi Seyed Hamid

• Department of Civil Engineering, Arak University, Arak, Iran

autor

Koohestani Saeideh

• Department of Physics, Najafabad Branch, Islamic Azad University, Najafabad, Iran

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).