EARTH

[3812-23-04] A study on Stabilization of Electric Arc Furnace Slag

○Ting-Kai Hu¹, Chih-Ta Tsai², Ta-Wui Cheng¹, Wei-Hao Lee¹, Chang-Ching Ho³, Yu-Kang Ling⁴ (1. National Taipei University of Technology, 2. National Cheng Kung University, 3. Tung Ho Steel Enterprise Corp., 4. Hao Sheng Environment Corp.)

Chairman: Jae-Young Jung （Kyungpook National University）, Liyuan Chai (Central South University)

Keywords:EAF slag, Free-CaO, Geopolymer, Cement

The electric arc furnace (EAF) oxidizing slag is produced by the steel plant as an industrial by-product, with a production of 100 million tons in Taiwan. The purpose of this study was to stabilize the EAF oxidizing slag by using oxalic acid as a replacement for fine aggregates in cement mortar process and using geopolymer technology to prevent oxidizing slag expansion. The experimental results showed that using oxalic acid could significantly stabilize the EAF oxidizing slag, and the mechanical properties. The EAF oxidizing slag in the geopolymer system could completely inhibit the expansion. The test samples in geopolymer system had higher compressive strength than cement system. The 28 days compressive strength of geopolymer system and cement system were 30MPa and 22MPa, respectively. These results gave encouragement that the stabilized EAF oxidizing slag could be replaced as a feasible natural fine aggregate.