Study on Preparation of Coal Gangue-Based Geopolymer Concrete and Mechanical Properties

Table 7

Compressive strength and flexural strength of each specimen cured for 28 days at room temperature.

Numbers	G1	G2	G3	G4	G5	G6	G7	C
Compressive strength (MPa)	71.9	64.3	56.4	53.7	79.7	53.8	46.6	38.9
Flexural strength (MPa)	4.79	4.54	4.36	4.31	5.89	5.52	3.57	3.21