Akademik Veri Yönetim Sistemi
MATERIALS RESEARCH EXPRESS, cilt.12, sa.11, 2025 (SCI-Expanded, Scopus)
This study investigates the possibility of accelerating the slow early reaction process of sodium carbonate (SC) activated slag (GGBFS) mixtures by adding a small amount of calcium oxide (quicklime, CaO) or calcium hydroxide (hydrated lime, Ca(OH)2). The effects of these additions on the compressive strength of SC-activated slag (SCAS) binders at ambient temperature and steam curing conditions have been investigated. Test results showed that the flowability of the mortars decreased with the substitution of quicklime and hydrated lime. It has been observed that the SCAS mixture, which has a very long setting time and very low compressive strength, can have reasonable early and ultimate compressive strength (up to about 8 MPa at 2-day and 45 MPa at 28-day) and setting times (between 25-240 min) with the addition of a small amount of quicklime or hydrated lime. The ultimate compressive strength of SCAS cured at ambient temperature showed a decreasing tendency with increased quicklime and hydrated lime contents. The optimum lime content for both quicklime and hydrated lime was found to be between 3% and 4%. The early age compressive strength of quicklime and hydrated lime incorporated SCAS can be significantly improved by steam curing. Compressive strength values reaching 28 MPa at 2 days was achieved by steam curing at 50 degrees C after a 24 h pre-curing time. Steam curing temperatures above 50 degrees C caused a significant reduction in the ultimate compressive strength of SCAS.