Abstract
A parameter study using a jaw crusher is designed to investigate the influence of feed gradation, feed rate, crusher setting and crusher speed on the crusher operation and the quality of the produced aggregates. The study is focused on the production of all-in large-size (top size ⩾90 mm) aggregates, suitable for use in subbase and frost protection layers in a pavement structure. Aggregate quality is measured in terms of product gradation, particle shape and mechanical properties.Feed gradation, crusher setting and crusher speed affects the specific energy consumption during crushing. Particle shape is affected by all parameters; feed gradation, feed rate, crusher setting and crusher speed. Mechanical properties are least affected by the jaw crusher parameters, but sample preparation using laboratory crushing clearly affect mechanical properties.The results from this study provide valuable knowledge for the optimisation of single-stage crushing regarding crusher operation and aggregate quality. By adapting the crushing process to the available feed material and desired product, the quality of the crushed product can be optimised along with the crusher operation.
Highlights
In road construction, local aggregate resources can be utilised through aggregate production on the construction site
When the crusher is fed at the high feed rate, the measured throughput can be characterised as the capacity of the crushing operation
The full-scale parameter study allowed for a range of feed material sizes, reduction ratios and crusher operation parameters to be combined
Summary
Local aggregate resources can be utilised through aggregate production on the construction site. The aggregate production process, where construction aggregates are produced from bedrock, often involves several crushing steps. The output is normally considered a product after two or more crushing stages. Primary, or single-stage, crushed aggregate materials can be used as products in road construction, in e.g. unbound subbase and frost protection layers. Such productions usually involve a simple setup with mobile crushing equipment. Research into aggregate production and quality have traditionally been focused on products from subsequent crushing stages, not products from primary crushing. There is a knowledge gap regarding the influence of the crushing process on the quality of primary crushed aggregates
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