Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil AdditionReportar como inadecuado


Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition


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1

Department of Geotechnical Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland

2

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

Abstract 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





Autor: Małgorzata Franus 1, Grzegorz Jozefaciuk 2, Lidia Bandura 1,* , Krzysztof Lamorski 2, Mieczysław Hajnos 2 and Wojciech Franus 1,*

Fuente: http://mdpi.com/



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