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

Table 3

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

Curing temperature (°C)	NaOH amount (with respect to WFS amount, w/w) (%)	UW (g/cm^3)	CS (MPa)		WAP (%)	Porosity (%)
			7 days	28 days
50	10	—	—	—	BIW	BIW
	20	—	—	—	BIW	BIW
	30	—	—	—	BIW	BIW
75	10	1.42	1	1	BIW	BIW
	20	1.44	1	1	BIW	BIW
	30	1.50	1	1	BIW	BIW
100	10	1.41	2.4	2.5	29	35
	20	1.44	1.8	1.9	29	33
	30	1.51	1.1	1.2	28	33
150	10	1.40	1.7	1.8	28	34
	20	1.45	1.6	1.6	27	32
	30	1.52	1.5	1.6	26	31
200	10	1.42	1.8	1.8	26	33
	20	1.45	1.6	1.6	24	31
	30	1.57	1.6	1.6	24	31

BIW: breakup in water.