Properties

Rock powder as aggregate for hydraulic binders

Quelle/Source: Prof. Anette Müller, IAB Weimar

1 Aufbau des Chapelle-Testes im Labor # The Chapelle test set-up in the laboratory

Quelle/Source: Prof. Anette Müller, IAB Weimar

2 Abhängigkeit der Druckfestigkeit von der substituierten Zementmenge # Dependence of the compressive strength on the substituted cement amount

Quelle/Source: Prof. Anette Müller, IAB Weimar

3 Abhängigkeit der Druckfestigkeit von der durch Quarzmehl substituierten Zementmenge # Effect of cement substitution by quartz powder on compressive strength

Quelle/Source: Prof. Anette Müller, IAB Weimar

4 Lage der Gesteinsmehle im Dreistoffsystem CaO – Al₂O₃+Fe₂O₃ – SiO₂ # Position of the rock flours in the three-phase system CaO – Al₂O₃+Fe₂O₃ – SiO₂

Quelle/Source: Prof. Anette Müller, IAB Weimar

5 Partikelgrößenverteilungen der Gesteinsmehle im Ausgangszustand # Particle size distributions of rock flours in the starting state

Quelle/Source: Prof. Anette Müller, IAB Weimar

6 Partikelgrößenverteilungen der nachgemahlenen Gesteinsmehle Diabas A, Diabas B und Rhyolith E # Particle size distributions of the reground rock flours Diabase A, Diabase B and Rhyolite E

Quelle/Source: Prof. Anette Müller, IAB Weimar

$7 Partikelgrößenverteilungen der Sichtfraktionen der Gesteinsmehle Diabas B und Rhyolith E, Sichterdrehzahl 200 Hz # Particle size distributions of the classified fractions of the rock flours Diabase B and Rhyolite E, classifier speed 200 Hz$ Quelle/Source: Prof. Anette Müller, IAB Weimar

7 Partikelgrößenverteilungen der Sichtfraktionen der Gesteinsmehle Diabas B und Rhyolith E, Sichterdrehzahl 200 Hz # Particle size distributions of the classified fractions of the rock flours Diabase B and Rhyolite E, classifier speed 200 Hz

Quelle/Source: Prof. Anette Müller, IAB Weimar

8 Reaktivität ausgewählter Gesteinsmehle anhand des Ca(OH)₂-Verbrauchs beim Chapelle-Test # Reactivity of selected rock flours based on the Ca(OH)₂ consumption in the Chapelle test

Quelle/Source: Prof. Anette Müller, IAB Weimar

9 Reaktivität ausgewählter getemperter Gesteinsmehle anhand des Ca(OH)₂-Verbrauchs beim Chapelle-Test # Reactivity of selected tempered rock flours based on the Ca(OH)₂ consumption in the Chapelle test

Quelle/Source: Prof. Anette Müller, IAB Weimar

10 Einfluss der Zementsubstitution durch das Basaltmehl auf die Druckfestigkeit von Mörtelprismen # Influence of the cement substitution with the basalt flour on the compressive strength of mortar prisms

Quelle/Source: Prof. Anette Müller, IAB Weimar

11 Einfluss der Zementsubstitution durch Rhyolithmehl E auf die Druckfestigkeit von Mörtelprismen # Influence of cement substitution with rhyolite flour E on the compressive strength of mortar prisms

Quelle/Source: Prof. Anette Müller, IAB Weimar

12 Einfluss der Zementsubstitution durch Grauwackemehl auf die Druckfestigkeit von Mörtelprismen # Influence of cement substitution with greywacke flour on the compressive strength of mortar prisms

Quelle/Source: Prof. Anette Müller, IAB Weimar

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...