Next Article in Journal
Distribution, Enrichment and Modes of Occurrence of Arsenic in Chinese Coals
Previous Article in Journal
The Activation Mechanism of Bi3+ Ions to Rutile Flotation in a Strong Acidic Environment
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Minerals 2017, 7(7), 112; https://doi.org/10.3390/min7070112

A Novel Model of Aggregate Gradation for Autoclaved Bricks from Tailings

1
School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China
2
School of Resources and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
*
Authors to whom correspondence should be addressed.
Received: 3 June 2017 / Revised: 21 June 2017 / Accepted: 27 June 2017 / Published: 2 July 2017
Full-Text   |   PDF [4238 KB, uploaded 2 July 2017]   |  

Abstract

Mining tailings as a raw material for preparing autoclaved bricks have attracted much attention. The tailings subjected to milling always have the characteristic of fine granularity. However, the proportion of the fine aggregates in autoclaved bricks was very low using the current gradation formula, which impeded the utilization of the tailings. In this work, a novel model of aggregate gradation for autoclaved bricks from tailings has been presented, which was established through the following steps: (1) 91 groups of autoclaved bricks with different aggregate gradations were prepared, with the proportion of the fine aggregates (−0.15 mm) in the range of 40% to 100%; and (2) the particle size distributions of the finest and coarsest aggregates in the high-strength region were fitted to establish the model. The proportion of the fine aggregates calculated by the model could increase significantly compared with that using the current formula. To verify the novel model, autoclaved bricks from iron ore tailings were prepared using the model, with their mechanical and freezing resistance properties meeting the requirement of the highest-strength level. It was observed by SEM that the autoclaved bricks had compact structures with a few small pores owing to the reasonable aggregate gradation. View Full-Text
Keywords: aggregate gradation; model; tailings; autoclaved bricks; strength aggregate gradation; model; tailings; autoclaved bricks; strength
Figures

Figure 1

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhang, T.; Zhao, Y.; Wang, W.; Yi, H.; Li, H.; Zhang, Q.; Song, S. A Novel Model of Aggregate Gradation for Autoclaved Bricks from Tailings. Minerals 2017, 7, 112.

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

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top