USAGE OF BAYBURT STONE IN ROAD INFRASTRUCTURES AS A IMPROVEMENT MATERIAL

Subgrade is one of the most important factor which affects the operating time of highways. Subgrade of highways which are a part of freight transportation network exposes to more pressure. Therefore, stabilization of subgrades becomes more important for these highways. Usage of sustainable and eco friendly resources produce economic and effective solutions for stabilization of highways. BS can be a good example of the solution which are mined in Bayburt city, the north-east of Turkey. Bayburt Stone (BS) is Eocene age and consist of zeolite minerals. Because of containing high value of amorphous silica, tuffic Bayburt stones have pozzolanic activity. Therefore, the stones have binding characteristics when they mix in lime. In this study, It is intended to show that BS waste which obtained from the stone quarries during the stone processing, can be used as a stabilizing material in subbase layers of highways. Within the scope of the study lime and lime - BS mixtures were used to improve clayey subbase layers. In the experimental studies, different amount of 0.2-80 mu m diameter BS and lime mixtures were used and improvement results of lime, lime - BS mixtures were compared. The obtained stabilization materials were tested for clayey soils. In this context nonconfined compression test, shear box, XRD, XRF and Particle Sizer tests, standard compaction and soil classification tests (Liquid-Plastic Limit Test, Sieve Analysis, Hydrometer Analysis) were performed. As a result of study it was observe that the strength of samples which obtained from lime-BS increased remarkably and it's possible to make compaction with lower compaction energies.