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Materials 2016, 9(10), 845;

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

Department of Geotechnical Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
Department of Physical Chemistry of Porous Materials, Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
Authors to whom correspondence should be addressed.
Academic Editor: Tobias Fey
Received: 4 August 2016 / Revised: 21 September 2016 / Accepted: 6 October 2016 / Published: 18 October 2016
(This article belongs to the Special Issue Porous Ceramics)
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An admixture of lightweight aggregate substrates (beidellitic clay containing 10 wt % of natural clinoptilolite or Na-P1 zeolite) with used motor oil (1 wt %–8 wt %) caused marked changes in the aggregates’ microstructure, measured by a combination of mercury porosimetry (MIP), microtomography (MT), and scanning electron microscopy. Maximum porosity was produced at low (1%–2%) oil concentrations and it dropped at higher concentrations, opposite to the aggregates’ bulk density. Average pore radii, measured by MIP, decreased with an increasing oil concentration, whereas larger (MT) pore sizes tended to increase. Fractal dimension, derived from MIP data, changed similarly to the MIP pore radius, while that derived from MT remained unaltered. Solid phase density, measured by helium pycnometry, initially dropped slightly and then increased with the amount of oil added, which was most probably connected to changes in the formation of extremely small closed pores that were not available for He atoms. View Full-Text
Keywords: lightweight aggregates; used oil; pore structure; microtomography; porosimetry lightweight aggregates; used oil; pore structure; microtomography; porosimetry

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Franus, M.; Jozefaciuk, G.; Bandura, L.; Lamorski, K.; Hajnos, M.; Franus, W. Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition. Materials 2016, 9, 845.

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