## 1 Introduction
The 28-day compressive strength of fly ash geopolymer was improved by 23% with the addition of GO admixed at 0.02% by mass of fly ash, where a nuclear magnetic resonance (_NMR_) study showed that the GO improved the polymerization degree by increasing the total Q3 and Q4 Si-tetrahedrons, suggesting potential for improving the immobilization of heavy metals in fly ash [51]. [PERSON] et al. [17] investigated the mechanical properties, morphological changes, and chemical functional group changes of fly ash geopolymer composites by incorporatingrGO and GO in fly ash geopolymer composites and found an increase of 134% in flexural strength, 376% in the Young's modulus, and 56% in toughness due to the restacking of rGO as a nano filler. The use of MgO as a shrinkage-reducing mineral additive dates back to the mid-1970s [52]. The chemical, autogenous, and drying shrinkage decrease with the addition of reactive MgO in the presence of water, as it reacts to form fine Mg(OH)\({}_{2}\) crystals in geopolymer paste to produce uniform expansion, refine the pore size, and increase the compressive strength [53]. An increase in compressive strength of 26% at an early age was observed for AA slag (AAS) pastes with 5% MgO [54]. The effect of MgO in AAS systems has been investigated, both in terms of its varying natural content in different slag compositions [55] and its use as an additive [56]. Studies on this topic revealed that, although the main hydration product is still C-S-H gel, MgO reacts with the slag to form hydrol calcite 'Ht' (Mg6 Al2(OH)16 CO3-4H2O)-like phases whose content increases with increases in the MgO content. The formation of low-density Ht/M-S-H phase (compared to CSH) was also confirmed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) analyses, and was shown to cause healing for cracks resulting from the shrinkage of AAS [55; 57]. The literature contains previous research on the fresh state and mechanical properties of AA/geopolymer binders but limited research on AAECs incorporating CNTs/MWCNTs, with no significant studies using rGO, MgO, or a combination of MgO-MWCNTs/rGO. Moreover, the current literature does not provide specific directives to assess changes in the complicated fresh state, mechanical, or micro-structural properties of AAECs containing nanomaterials (such as MWCNTs or rGO), self-healing agents like MgO, or their combinations. In addition, most of the currently available literature is concentrated on the performance of heat-cured AAECs using the two-part (wet mix) rather than the one-part (dry mix) technique with solution-based reagents (which are corrosive and difficult to handle) and low calcium-based systems. This paper focuses on the development and evolution of the fresh state and mechanical properties of PVA-fiber-reinforced ambient-cured AAECs containing healing agents (such as MgO) and nanomaterials (MWCNT and rGO). The novel aspects of this study addressing the current research gaps are the use of binary and ternary combinations of FA and GGBFS as precursors, two combinations of reagents (type 1 and type 2), high-calcium-based activators/regents rather than traditional Na-based ones, and a one-part dry mix technique with ambient curing as well as a comparative performance study considering variable mix design parameters and materials. The influences of the mix ingredients, such as the combinations of reagents, binary/ternary blends, fundamental chemical ratios present in the precursors/reagents, and the MWCNT/rGO/MgO dosages, on the physical properties in terms of workability (slump flow, flow time, flow velocity, and setting times) and mechanical properties (compressive strength and ultrasonic pulse velocity 'UPV') of AAECs have been described with reference to micro-structural characterization using SEM/EDS, XRD, and FTIR analyses. Moreover, correlations among the fresh state and mechanical properties (compressive strength-UPV) of the studied materials are developed.