STS 슬래그 활용을 위해 증기양생한 무시멘트 모르타르의 물리적 특성 검토

초록

This investigation examines the feasibility of incorporating Stainless Steel(STS) slag, an industrial waste by-product, as a constituent material in cementless mortar formulations. The research focused on a ternary system comprising ground granulated blast-furnace slag(BFS) powder, natural gypsum, and varying proportions of STS slag, with steam curing applied to accelerate early-age strength development. The primary research objective was to evaluate the influence of STS slag incorporation on the physico-mechanical properties of the resultant mortar systems. Results indicated that steam curing effectively activated hydration mechanisms, facilitating adequate early-age compressive strength development. Mortars incorporating 10% STS slag(by mass of total binder, substituting BFS) achieved greater than 90% of the compressive strength exhibited by the control mixture(formulated without STS slag, designated as STS-00) while demonstrating comparable drying shrinkage behavior and void characteristics. However, increasing STS slag substitution levels beyond 10% resulted in reduced workability and the formation of larger, more interconnected void networks. These microstructural modifications were observed to adversely impact long-term void structure development and subsequent strength evolution. Consequently, within the parameters of this investigation, a 10% substitution ratio of BFS with STS slag is identified as the optimal proportion for developing cementless mortars with acceptable performance characteristics.

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