Influence of a Clay Ground Stabilized with Blast Furnace Slag on Flexible Road Pavement Thickness and Cost

Yıl 2020, Cilt: 1 Sayı: 2, 17 - 31, 31.12.2020

Mehmet Mahmut Tanyıldızı

Öz

It has become a necessity in Highway Engineering, due to today's heavy vehicle traffic loads, that subgrade with weak bearing capacity on which the road trunk will rest be improved with various methods and additives. In this study, it has been aimed to improve a clay soil with weak 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. For this purpose, in the study, stabilized mixture samples have been 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 rate (CBR) tests have been performed to the samples. As a result of experimental studies, it has been 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. In addition, the highest unconfined compression strength has been obtained from 20% BFS doped 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 doped ground has been calculated and superstructure cost analyzes have been made with the help of current prices. As a result of the calculations, it has been determined that adding 20% BFS to the soil decreased the road pavement layer thickness by 29.41% compared to the pure clay soil in the design calculation made according to the layer thicknesses determined for both soils. According to the cost calculation results, the cost of the pavement for clayey soils containing 20% BFS has decreased by approximately 5.65% compared to the pure clay soil. According to these results, when the subgrade of a 1000 m long road is improved with 20% BFS, 8,400.00 TL saving will be provided in the cost of flexible pavement.

Anahtar Kelimeler

clay soil, Blast furnace slag, Stabilization, Flexible pavement, AASHTO method

Destekleyen Kurum

Inonu University Scientific Research Projects (SRP) Coordination

Proje Numarası

project number FDK-2018-957.

Teşekkür

This study has been supported by Inonu University Scientific Research Projects (SRP) Coordination Unit, project number FDK-2018-957.

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