This study is a basic research on the use of electronic arc furnace (EAF) oxidizing slag as aggregate for concrete, and evaluates characteristics of compressive stress distribution of concrete with EAF oxidizing slag aggregates. EAF oxidizing slag is by-product generated from the steel industry, and has high applicability as aggregate for concrete because it has similar chemical composition to that of natural aggregates. Above all, for using EAF oxidizing slag aggregates for concrete, it is necessary to determine concrete compressive characteristics which is directly affected by aggregates. In this study, therefore, thirty specimens with test variables such as type of aggregate and concrete compressive strength are designed, and tested under axial load and bending moment.
This study consists of five chapters, and the contents are as follows:


▣ Chapter Ⅰ : Introduction

▣ Chapter Ⅱ : Theoretical backgrounds

▣ Chapter Ⅲ : Electric arc furnace oxidizing slag aggregate

▣ Chapter Ⅳ : Test results and analysis of compressive stress distribution characteristic of concrete with electric arc furnace oxidizing slag aggregates

▣ Chapter Ⅴ : Conclusions


The conclusion obtained from results of this study as follow:

1. The compressive stress distribution of each specimen for varying the type of aggregate was compared by the non-dimensional stress-strain relationship. As a result, it was revealed that the compressive stress distribution areas of specimens with EAF oxidizing slag aggregates are larger than those with natural aggregates. It denotes the increase of total compressive force in concrete with EAF oxidizing slag aggregates.

2. The compressive deformation capacity of each specimen for varying the type of aggregate was compared by the ratio of ultimate strain to compressive strain at peak. The test results showed that the ratios for specimens with EAF oxidizing slag aggregates are 17% higher in the range of about 30MPa and 11% higher in the range of about 80MPa than those with natural aggregates. Eventually, It was confirmed that the specimens with EAF oxidizing slag aggregates are more flexible than the others.

3. Finally, it was confirmed that the compressive stress distribution parameters k₁k₃ and k₂ of concrete with EAF oxidizing slag aggregates are in the range of the criteria proposed in ACI 318-11 building code, and they are respectively 15% and 17% higher in the range of compressive strength from 30MPa to 80MPa than those with natural aggregates.

Based on data accumulated from this study and further experimental studies, more accurate compressive stress distribution factors (k₁, k₂, k₃) and ultimate strain of concrete with EAF oxidizing slag aggregates will be proposed.