Assessment the Effect of Waste Mine Stone on the Strength of Roller Compacted Concrete Pavement

The development and use of roller concrete is growing in Iran. Considering the low cost of manufacturing and long life of this pavement, it is necessary to have a durable and resistant to load. Resistance characteristics and stone materials type are amongst the most effective factors in compacted concrete pavement's resistance to load. Stone materials are the most important factor in abrasive strength as they constitute more than 85% of roller compacted concrete pavement. Therefore, the current research was conducted with the aim to investigate the effect of stone material on this pavement strength. In order to investigate the material, one control stone material and four different stones obtained from debris of Choghart mine and other mines were used. The material of the aggregate used in this research includes lime stone, dolomite, calcite amphibolites, and quartz albeit. At first, in order to determine the quality of aggregate in the stone mechanical tests, including compressive strength and tensile strength, tests were done on stone materials, and then roller compacted concrete specimens were made using soil density method with grading presented code 731 and the maximum nominal size of 19 mm in order to determine the optimal moisture content. After that, the concrete specimens with optimal moisture were made in the cylinder form using density method. Compressive strength and tensile strength tests were done on hardened concrete specimens. Using quarts aggregate in this research caused compressive strength to improve by 20%. On the other hand, results showed that concrete tensile strength does not depend on aggregate material.