Effects of Water on Pore Structure and Thermal Conductivity of Fly Ash-Based Foam Geopolymers

Table 3

Total porosity and porosity with φ < 360 μm and φ > 360 μm and average pore size of FA-based foam geopolymers with different W/S.

W/S	0.38	0.41	0.44	0.47	0.5
Microcapillaries (%)	0.15	0.25	0.37	0.43	0.52
Macrocapillaries (%)	11.35	17.45	23.58	32.5	41.17
Artificial air pores (%)	77.44	72.16	66.7	58.22	50.25
Porosity1 (φ < 360 μm) (%)	68.13	75.19	83.37	86.42	89.08
Porosity2 (φ > 360 μm) (%)	20.81	14.67	7.28	4.73	2.86
Total porosity (%)	88.94	89.86	90.65	91.15	91.94

Total porosity was obtained by the difference between true density and bulk density of geopolymers. Porosity1 was obtained by MIP. Porosity2 was obtained by the difference between total porosity and porosity1.