| dc.description.abstract | It has become a necessity in Highway Engineering, due to today's heavy vehicle traffic loads, that
subgrade with poor bearing capacity on which the road will rest be improved with various methods and additives.
In this study, it has been aimed to improve clay soil with poor bearing strength with the contribution of waste blast
furnace slag (BFS) and to investigate its effect on the thickness and cost of flexible road pavement. This study
aims to improve clay soil with poor bearing strength with the contribution of waste BFS. Moreover, it tries to
investigate the effects of BFS on the thickness and cost of flexible road pavement. For this purpose, in the study,
stabilized mixture samples were prepared by adding 5, 10, 15, 20% by weight of BFS to the clay soil. After these
prepared samples have been mixed homogeneously, standard proctor, unconfined compression and California
Bearing Ratio (CBR) tests were applied to the samples. As a result of experimental studies, it was observed that
the increase in BFS resulted in a decrease in the maximum dry density of the samples and an increase in the
optimum moisture content. Also, the highest unconfined compression strength was obtained from 20% of BFS
added samples. CBR values of the samples tested at this rate increased by 8.71 times compared to pure clay soil.
Using these experimental data, the flexible road pavement layer thicknesses to be constructed with the AASHTO
1993 method on the BFS added ground were calculated, and pavement cost analyzes were made considering
current prices. As a result of the calculations, the design calculation was made according to the layer thicknesses
determined for both soils. it was determined that adding 20% BFS to the soil decreased the road pavement layer
thickness by 29.41% compared to the pure clay soil. The cost calculation results show that compared to the pure
clay soil, there is about a 5.65% decrease in the pavement cost for clayey soils with 20% BFS. According to these
results, when the subgrade of a 1000 m in length and 20 m in width road is improved with 20% BFS, 8.400,00 TL
saving will be provided in the cost of flexible pavement | en_US |
