Ceramics-Silikáty 55, (2) 161 - 168 (2011) |
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EFFECTS OF RFCC SPENT CATALYST ON SOME PHYSICOMECHANICAL PROPERTIES OF PORTLAND CEMENT PASTE
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Allahverdi Ali 1, Vakilinia Shokoufeh 1, Gharabeglu Pooneh 2
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1 Cement Research Center, School of Chemical Engineering,
Iran University of Science and Technology, Narmak 16846-13114, Tehran, Iran
2 R&D Department, NIOEC Company,
No. 263, Ostad Nejatollahi St., Tehran, Iran
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Keywords: Spent Catalyst, Portland Cement, Compressive Strength
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Spent catalyst from Residue Fluidized Catalytic Cracking (RFCC) unit of petroleum refining processes is an important waste
material that should be treated in a suitable way. The main goal of this research is to evaluate the pozzolanic activity of
RFCC spent catalyst and to investigate its effects on some physic-mechanical properties of Portland cement paste. Results
show that workability and setting times of fresh pastes decrease by increasing the percentage of cement substitution. A
substitution of cement by spent catalyst between 15% and 20% by weight could increase the 360-day compressive strength of
the paste up to 108 MPa that shows 45% increase compared to the plain cement, i.e. 75 MPa. The interesting result is that
it is possible to have high substitutions up to 40% without any reduction in 28-day compressive strength compared to plain
cement. The RFCC spent catalyst is therefore a high quality supplementary cementing material. |
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