Next Article in Journal
An Evaluation of the Efficiency of Compartmented Alginate Fibres Encapsulating a Rejuvenator as an Asphalt Pavement Healing System
Previous Article in Journal
Non-Destructive Study of the Microstructural Effects of Sodium and Magnesium Sulphate Attack on Mortars Containing Silica Fume Using Impedance Spectroscopy
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Appl. Sci. 2017, 7(7), 650;

Effects of Fine Particles on Thermal Conductivity of Mixed Silica Sands

Department of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
School of Civil Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju, Chungbuk 28644, Korea
Author to whom correspondence should be addressed.
Academic Editor: Peter Van Puyvelde
Received: 17 April 2017 / Revised: 16 June 2017 / Accepted: 17 June 2017 / Published: 23 June 2017
(This article belongs to the Section Materials)
Full-Text   |   PDF [2277 KB, uploaded 26 June 2017]   |  


The physical properties of granular materials (such as hydraulic, strength, and thermal properties) are largely dependent on their density (or porosity) and particle size distribution. In infrastructure design, the thermal properties of soils are now more important than in the past. However, our understanding of the thermal properties of mixed granular materials is still poor. In this study, the thermal conductivity of silica sands with different porosities and particle sizes was experimentally investigated, based on ASTM D5334-14. The thermal conductivity of granular materials is presented as a function of the porosity and proportion of fine particles. The thermal conductivity tends to be low when the porosity is high and the proportion of fine particles is low (and vice versa). When the fine particles are small enough to fill the pore body of the larger particles, the coordination number increases; thus, the thermal conductivity increases when the proportion of fine particles is high. Therefore, both the porosity and particle size distribution should be carefully considered when the thermal conductivity of mixed silica sand is evaluated. View Full-Text
Keywords: thermal conductivity; silica sand; density; fine content; particle size distribution thermal conductivity; silica sand; density; fine content; particle size distribution

Figure 1a

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).

Share & Cite This Article

MDPI and ACS Style

Ahn, J.; Jung, J. Effects of Fine Particles on Thermal Conductivity of Mixed Silica Sands. Appl. Sci. 2017, 7, 650.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top