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

Table 4

Mixture ratio of coal gangue-based polymer concrete activated by dry powder (kg/m³).

Numbers	Coal gangue	Fly ash	Sodium hydroxide	Calcium carbonate	Sand	Pebble	Water-binder ratio	Percentage of sand
G1	196	196	66	110	583	1237	0.31	0.33
G2	196	196	66	120	621	1248	0.33	0.33
G3	196	196	66	145	640	1271	0.35	0.33
G4	196	196	44	198	574	1216	0.38	0.32
G5	196	196	72	198	588	1248	0.41	0.33
G6	196	196	98	198	652	1293	0.43	0.34
G7	196	196	168	—	615	1253	0.30	0.33

1: water-binder ratio = quality of dry powder activator/(quality of dry powder activator + quality of coal gangue + quality of fly ash). 2: percentage of sand = quality of sand/(quality of sand + quality of pebble).