Rock powder as aggregate for hydraulic binders

Summary: In the extraction and production of high-grade aggregates, the formation of finely dispersed particles is unavoidable. Up until now, these rock powder were only partly or not utilized at all. A research project sponsered by Germany’s Federal Ministry for Economic Affairs and Energy and supported by the industry was initiated to evaluate possibilities for using these materials in cements and concretes to utilize their dispersity and/or chemical properties. First, the influence of the particle size distribution on the packing density was investigated and the effects of a particle size distribution modified by grinding and classification were evaluated. The second focus was on reactivity in an alkaline milieu, certain specimens undergoing additional thermal treatment.

1 Current knowledge

The effect of finely dispersed waste and by-products in cements and concretes has been the subject of a large number of studies. In the case of the waste products used as cement substitute, so far the focus has been on “traditional” industrial by-products such as slag sand, coal fly-ash and microsilica [1-4]. In recent years, the studies have been widened to cover kaolins or clays [5-8]. In the case of these materials, the reactive potentials are first generated by means of thermal treatment so that the materials can then be used as a cement component [9-20]. Other studies...

Order the printed issue

Related articles:



Dear Readers, Have you already planned the upcoming New Year holidays? Maybe skiing or a trip to warm, sunny climes is on the program? “Travel” is also the topic in our market review by Dr....


Properties and system parameters

Quantitative characterization of rocks to predict the influence of the rock on relevant product properties and system parameters Part 2: Selected examples

1?The correlation between selected rock characteristics and relevant product properties The discoveries discussed are based on correlations taken from the technical literature, on test results...


POWTECH 2013 – Number one for powder, granule and bulk solids technologies

W?hatever mineral source materials are used for, the ­decisive factors for the quality of the manufactured products include sophisticated screening equipment and particle analysis tailored to the...


Storage reservoir built with Rockster’s R900

The company G. Hinteregger & Sons Construction Company Ltd. from Salzburg were commissioned from mid-June to mid-October 2014 to build a storage reservoir with about 70?000 m³ capacity and a pumping...


Mobile Screener for Silo Unloading

Francis Flower – formed in 1953 – provides a range of high-quality powdered minerals, limestone powders, super-fine white marble powders and other products for the agricultural and construction...