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Characterization of recycled materials for use in road construction and determination of permanent deformations with the cyclic load triaxial test

Project carried out with financial support from the Federal Public Service (FPS) Economy, SMEs, Self-Employed and Energy (Contracts CC CCN/PN/NBN-506 and CC CCN/PN/NBN-556 – 1st September 2008 - 1st September 2010)

The tests were carried out on the reference material (limestone) and two secondary materials (recycled concrete aggregate and recycled steel slag). In order to determine an appropriate test procedure, 100,000 cycles of repetitive loading were applied with one stress level (single stage loading) as well as with gradually increased stress levels (multi-stage loading). Deformations were measured in a similar way as for recoverable (see the project Characterization of recycled materials for use in road construction and determination of the resilient moduli with the cyclic load triaxial test), An extra strain transducer was placed at the outside of the triaxial cell, to measure bigger deformations. Two compaction methods were used in preparing the test samples, viz. vibrating hammer (in six layers) and vibrocompression. The influence of water content and density after compaction on permanent deformations was investigated.