Potentials for Using Pulverized (Micro-Milled) Mineral Waste Materials as Stabilizing Agents or Fillers in Cold Recycled Mixes

摘要

Presented paper introduces alternative solution to use another types of secondary materials or potential waste materials in cold recycled mixes either as active filler, partial miner admixture or a substitute to hydraulic binders. The intention of the study described by this paper is to describe additional potentials of high-speed grinding if applied to selected mineral waste materials. The use of such materials should have also its environmental and economic benefit. Environmentally it might be a solution for treating waste materials or byproducts to get solutions with higher technical added value. The preliminary study focused on two types of fine-grained mineral by-products which were pulverized to a size below 50 μm with expected mechanical or mechano-chemical activation. These microfillers were applied to standard cold recycled mixtures which came e.g. from the European research project CoRePaSol and standard tests were performed to evaluate the potentials of using the pulverized limestone or recycled concrete either as active filler or binder substitute. Results are summarized by this paper showing any effect on strength properties, but for several options highlighting improved durability in terms of moisture susceptibility. Higher potential can be expected with pulverized concrete where reactivity of the material might occur as the result of presence of hydrated cement.