Studies of Surface Area and Pore Structure on Portland Cement Produced in Bajil and Amran, Yemen
| Autor: | Abdulla Saleh Babaqi, Abdulla A. Basissa, Fatima A. Al-Kadri, S.A. Abo El-Enein, Abdul-Basit A. Saleh, A.M. Saad |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Cement
Materials science Portland cement Adsorption technology industry and agriculture Surface area chemistry.chemical_element Mineralogy Pore system Cement paste Nitrogen law.invention Hysteresis chemistry Volume (thermodynamics) law Nitrogen gas Pore size Composite material lcsh:Science (General) lcsh:Q1-390 |
| Zdroj: | Sultan Qaboos University Journal for Science, Vol 13, Iss 0, Pp 13-25 (2008) |
| Popis: | Portland cement pastes of various porosities were prepared using water/cement ratios of 0.30, 0.35, 0.40, 0.45, 0.50 and 0.55; and were hydrated for various time intervals ranging from 0.021 to 28 days. Pore structure and VL–t plots (plots of volume vs. thickness) of the hardened cement pastes were measured using nitrogen gas as the adsorbate. The results were found to be related to the mechanism of hydration as controlled by the pore system of the hardened pastes. Type ІІ adsorption isotherms of nitrogen were obtained for all hardened cement pastes. The adsorption-desorption isotherms indicated the existence of closed hysteresis loops for most of the investigated samples and in some other cases, these isotherms were fully reversible. |
| Databáze: | OpenAIRE |
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