Impact of nano-alumina on the mechanical characterization of PVA fibre-reinforced geopolymer composites

Figures & data

Figure 1. SEM micrograph of nano-alumina particles.

Table 1. Chemical structure of the fly ash that was used in the preparation of geopolymer samples.

SiO2	Al2O3	CaO	Fe2O3	K2O	MgO	Na2O	P2O5	SO3	TiO2	MnO	BaO	LOI
63.13	24.88	2.58	3.07	2.01	0.61	0.71	0.17	0.18	0.96	0.05	0.07	1.45

Table 2. Some physical characterization of PVA-fibres.

Length	Diameter	Modulus of elasticity	Fibre strength	Density	Elongation
8 mm	0.04 mm	40,000 MPa	1600 MPa	1.3 g/cm^3	6%

Table 3. Contents of composites.

Sample	Fly-Ash (g)	NaOH (g)	Na2SiO3 (g)	Nano-alumina (g)	PVA (%)
PVAGNC-0	1000	214.5	535.5	0	2.0
PVAGNC-1	1000	214.5	535.5	10	2.0
PVAGNC-2	1000	214.5	535.5	20	2.0
PVAGNC-3	1000	214.5	535.5	30	2.0

Figure 2. (a) XRD patterns of fly ash and nano-alumina. (b) XRD patterns of geopolymer composites.

Figure 3. Flexural and compressive strength of PVA fibre-reinforced geopolymer composites in MPa.

Figure 4. Flexural stress–strain of PVA fibre-reinforced geopolymer composites.

Figure 5. Compressive stress-strain of PVA fibre-reinforced geopolymer composites.

Figure 6. SEM micrograph showing the microstructure of fractured surface of (a) PVAGNC-0, (b) PVAGNC-1, (c) PVAGNC-2 and (d) PVAGNC-3.

Figure 7. Impact strength and hardness of PVA fibre-reinforced geopolymer composites.

Figure 8. Stiffness and flexural rigidity of PVA fibre-reinforced geopolymer composites.