Fireproofing Material from Alkali-activated EAF Ladle Slag

Pai Haung Shih, Dong Shyuan Lu, Ho Sheng Tsai, Juin Ting Wu, Juu En Chang

Research output: Contribution to conferencePaperpeer-review


Electric Arc Furnace Steel-making process has become one of the primary steel providing processes in Taiwan. Nevertheless, the potential soundness problem due to the free-CaO content has made EAF ladle slag (LS) limited the reuse of EAF LS. This research attempts to fireproofing porous material from LS by alkali-activated process. Sampled LS was tested for physical properties and Chemical composition analysis. The results showed that LS could be reuse as cementitious or pozzolanic material. Nevertheless, further accelerated mortar bar test and autoclave expansion suggested that f-CaO content in LS transformed into Ca(OH)2 in hydration late stage, and resulted in volume expansion with failure in meeting the soundness criteria. Alkali-activation technique could directly transform f-CaO content in LS into Calcium Silicate hydrate. Hence, Alkali-activated LS (AALS) would not have the Ca(OH)2 expansion and cracked problem. Further application of foaming agent could develop porous materials with density as low as 800 kg/m3. With this porous AALS process, light-weight fire-proofing partition wall utilization reuse of LS could be developed.

Original languageEnglish
Publication statusPublished - 2017
Event14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, Japan
Duration: 2017 Sept 262017 Sept 29


Conference14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
CitySapporo, Hokkaido

All Science Journal Classification (ASJC) codes

  • General Environmental Science


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