IAB – WEIMAR INSTITUTE OF APPLIED CONSTRUCTION RESEARCH

Rock powder as aggregate for hydraulic binders

All Prof. Anette Müller, IAB Weimar

1 The Chapelle test set-up in the laboratory

2 Dependence of the compressive strength on the substituted cement amount

3 Effect of cement substitution by quartz powder on compressive strength

4 Position of the rock flours in the three-phase system CaO – Al₂O₃+Fe₂O₃ – SiO₂

5 Particle size distributions of rock flours in the starting state

6 Particle size distributions of the reground rock flours Diabase A, Diabase B and Rhyolite E

$7 Particle size distributions of the classified fractions of the rock flours Diabase B and Rhyolite E, classifier speed 200 Hz$

7 Particle size distributions of the classified fractions of the rock flours Diabase B and Rhyolite E, classifier speed 200 Hz

8 Reactivity of selected rock flours based on the Ca(OH)₂ consumption in the Chapelle test

9 Reactivity of selected tempered rock flours based on the Ca(OH)₂ consumption in the Chapelle test

10 Influence of the cement substitution with the basalt flour on the compressive strength of mortar prisms

11 Influence of cement substitution with rhyolite flour E on the compressive strength of mortar prisms

12 Influence of cement substitution with greywacke flour on the compressive strength of mortar prisms

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 a 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...

TEXT Dr. sc. nat. Annett Lipowsky, Prof. Dr.-Ing. habil. Anette Müller, Dr.-Ing. Ulrich Palzer, Dr.-Ing. Barbara Leydolph, IAB – Weimar Institute of Applied Construction Research, Weimar/Germany

Rock powder as aggregate for hydraulic binders

1 Current knowledge

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1 Current knowledge

ZKG 1-2/2020

ZKG 1-2/2020

Related articles:

Use of quarry fines and/or limestone powder to reduce clinker content of cementitious compositions

Use of quarry fines and/or limestone powder to reduce clinker content of cementitious compositions

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Use of quarry fines and/or limestone powder to reduce clinker content of cementitious compositions

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