Scholarly record

REUSE OF SECONDARY MATERIALS FROM QUARRIES AS AGGREGATES IN ULTRA HIGH PERFORMANCE CONCRETE

M. Medrano, P. Harsanyi, S. Ofner, A. Schindler-Kunnert, M. Schneider

Abstract

The stone industry is one of the most essential industries in the Alpine region. This research aims to evaluate the possibility of reusing secondary waste materials produced by the quarry sector as aggregates in Ultra-High-Performance Fiber Reinforced Concrete (UHPFRC). The secondary materials involved were Diabase Sand, Diabase Powder, Dolomite Sand and Dolomite Gravel from crushed stone quarries from the regions of Carinthia and Tyrol in Austria, as well as Limestone Powder from the preparation and production of stone blocks and slabs for decorative use from the Friuli Venezia Giulia region in Italy. This study aimed to compare a reference mixture with more commonly utilized aggregates in the production of UHPFRC with mixtures made out of secondary materials from quarries in terms of compressive strength. The replacements in the mixtures were made following the principle of optimizing the aggregate grading curves. Therefore, the particle size distribution of the mixtures was designed in order to follow the optimal particle packing density curves according to Andreasen and Andersen (A&A). The different concrete mixes to be compared were cast in cubes of 100x100x100 mm and the compression strength was tested at 7 and 28 days, from which mean values were calculated. Afterwards, these results were compared with the reference sample. In comparison, it could be observed that those mixtures containing replacements of Diabas Sand and Limestone Powder show compressive strength values that make them suitable for producing UHPFRC out of secondary materials. These kind of materials are otherwise considered as waste and disposed in nonoperational areas of the quarry or landfills. This offers the possibility of producing ecological friendly High-Performance Concrete with respect to a low CO2 impact of the utilized waste materials.

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DOI resolver: doi.org/10.5593/sgem2021v/6.2/s26.16

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