Enhancing Early Strength Development of Alkali-Activated Slag through Preheating of Materials

Authors : Cemal Karaaslan

Pages : 1129-1138

Doi:10.21605/cukurovaumfd.1410789

View : 62 | Download : 51

Publication Date : 2023-12-28

Article Type : Research Paper

Abstract :Alkali-activated cements have gained attention as sustainable alternatives to Portland cement-based concretes. This study aims to enhance the early strength development of alkali-activated slag (AAS) mortars by preheating the alkali activator, ground granulated blast furnace slag, and aggregates to temperatures reaching up to 65°C before their utilization. Preheating at 50°C enhances both early and ultimate strength of AAS, compared to specimens that were not subjected to preheating. Similarly, preheating at 65°C results in a substantial increase in early strength but leads to some strength reduction after three days. SEM and FTIR analyses reveal that preheating at 50°C improves the interfacial transition zone between paste and aggregate, reduces microcracks, and promotes alkali activation. Furthermore, FTIR analysis confirms the occurrence of hydration reactions in AAS upon contact with water.
Keywords : Alkali aktive cüruf, Malzemelerin ön ısıtılması, Erken dayanımlı betonlar, Isıl kür, Suya dayanıklılık