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One-part alkali-activated materials (AAMs) are an alternative material to respond to the shortcoming of the conventional two-part systems. One-part AAMs are more practical and safer to handle from transporting to the casting stage on site. It can be applied in the form of paste, mortar, and concrete, providing more options than an ordinary cement binder. The most common aluminosilicate precursors sources for the one-part AAMs are the combination or single raw material of fly ash, ground granulated blast furnace slag and metakaolin. However, it was found that the one-part AAMs experienced high porosity levels primarily due to their inconsistent pore structures that affect their long-term performance. One-part AAMs mortar is one of the cementitious products used as concrete repair materials that may be affected by these weaknesses. Nevertheless, the combination of aluminosilicate precursor by-products with the ordinary Portland cement or hybrid AAMs help to develop a robust performance mainly used as a patching product for concrete repair materials. This hybrid one-part AAMs mortar can be composed with other admixtures with a suitable mix design to ensure its stability and useable in the form of a fresh and hardened state. Unlike the ordinary concrete, hybrid one-part AAMs have significantly strengthened growth beyond the 28th day. In this study, the mechanical strength of the mortar increased over time up to 63 N/mm2 at 56 days of curing age, shorter setting time and workable comparable to the control samples. In addition, the water to binder ratio of 3.0 activated the dry mixes and significantly improved the physical and microstructure of the hybrid one-part AAMs mortar. |
