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Aggregate quality and prospecting (»Add to Infobox)

Research Leader: Joanne Fernlund
Mimmi Arvidsson, Solomon Tafesse


Engineering Geology and Geophysics


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This project is carried out in cooperation with Prof. Torleif Dahlin at Engineering Geology at Lund University and Dr. Jan Erik Lindqvist at Sveriges Provnings och Forskningsinstitut and Prof. Fredrik Bergholm, KTH.

The aim of this project is to develop methods for characterization of aggregate quality, for use in prospecting for both rock mass and till deposits that would, if exploited, yield good quality aggregate. The methods should be easily implemented and interpreted. Thus, these methods will be important tools in assisting the selection of the best site available in the local area of an engineering construction for aggregate production. This requires a suite of interrelated studies that attack the subject of aggregates from different disciplines. The project is divided into four parts. Part 1 - till properties as an indicator of the potential quality of local bedrock as aggregate; Part 2 - development of a geophysical methods for interpretation of frequency of horizontal or sub horizontal discontinuities in the rock mass; Part 3 - Image Analysis to determine aggregate size and shape distribution and for interpreting the Los Angeles and Micro Deval tests; Part 4 - geophysical characterization and occurrence of coarse grained and thick deposits of till. A future project will deal with testing the prospecting potential of the methods developed in this project.

The increasing shortage of natural aggregate material from eskers makes it necessary to find alternative sources, such as rock quarries or gravel pits in till. This project focuses on a wide range of aspects concerning aggregates from prospecting to aggregate quality using several different methods. One part deals with new prospecting techniques for localizing both bedrock formations and till deposits which if exploited would yield high quality aggregates. Geophysical methods used will include electric, radar and seismic techniques. One aim is to establish a relationship between fracture frequency and geophysical parameters. Another aim is to detect till that is course grained and sufficiently thick to exploit. The rock mass quality will be coupled to the physical characteristics of the local till. Theoretically the till matrix should be similar to the bedrock when crushed. Thus we can determine if the rock when crushed will produce unwanted minerals or particle forms or if it will produce high quality aggregate material. The physical properties of the rock will be tested according to EU standards as well as with new 3-D image analysis methods for aggregate quality. The image analysis method can be used to determine the size distribution, particle form and surface texture more quantitatively and exactly than the EU methods. It is important, both economically and environmentally, that future sites for aggregate production produce high quality aggregates.

Period: 2006-01-01 - 2011-04-01

Keywords:
Aggregate quality; Prospecting for aggregates; Image analysis; Size distribution of aggregates; Geophysical properties; Till properties
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method for analysis of till composition

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method for analysis of boulder size, lithology and frequency

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3-d size distribution using image analysis

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3-d shape distribution with image analysis


SOURCE OF FUNDING (3/3) 

FORMAS (The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning)

Peab AB

SBUF (The Development Fund of the Swedish Construction Industry)

DOWNLOADS (1/1) 

description of project


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