Waste Foundry Sand Usage for Building Material Production: A First Geopolymer Record in Material Reuse

Table 4

The results of the WFS-based geopolymer materials produced by using Na₂SiO₃.

Curing temperature (°C)		Na2SiO3 amount (with respect to WFS, w/w) (%)	UW (g/cm^3)	CS (MPa)		WAP (%)	Porosity (%)
				7 days	28 days
75	38 bome	10	1.69	—	—	BIW	BIW
		20	1.60	—	—	BIW	BIW
		30	1.65	—	—	BIW	BIW
	48 bome	10	1.68	—	—	BIW	BIW
		20	1.80	—	—	BIW	BIW
		30	1.73	—	—	BIW	BIW
100	38 bome	10	1.65	0.7	—	BIW	BIW
		20	1.69	2.7	—	BIW	BIW
		30	1.57	0.9	—	BIW	BIW
	48 bome	10	1.67	0.9	1.3	BIW	BIW
		20	1.72	0.9	—	BIW	BIW
		30	1.55	0.9	—	BIW	BIW
150	38 bome	10	1.61	0.9	—	BIW	BIW
		20	1.56	0.9	1.3	BIW	BIW
		30	1.43	2.1	2.0	BIW	BIW
	48 bome	10	1.62	0.3	—	BIW	BIW
		20	1.59	0.6	2.6	BIW	BIW
		30	1.52	4.4	4.2	BIW	BIW
200	38 bome	10	1.64	0.9	0.7	BIW	BIW
		20	1.61	3.2	2.75	BIW	BIW
		30	1.39	4	4.3	BIW	BIW
	48 bome	10	1.63	1.1	1.1	BIW	BIW
		20	1.53	4.6	4.25	BIW	BIW
		30	1.41	9.1	12.3	BIW	BIW