Mixture Ratio Design Optimization of Coal Gangue-Based Geopolymer Concrete Based on Modified Gravitational Search Algorithm

Table 4

Mix design of different strength grades coal gangue-based geopolymer concrete (before optimization).

Strength grades	Cement (kg/m^3)	Fly ash (kg/m^3)	Coal gangue (kg/m^3)	Sand (kg/m^3)	Pebble (kg/m^3)	Water reducing agent (kg/m^3)	Water glass (kg/m^3)
C30	314	154	486	765	902	5.7	94.5
C35	330	188	452	736	865	6.1	131.8
C40	365	221	435	703	821	6.4	152.3
C45	402	258	417	664	785	6.8	157.9
C50	434	287	383	639	738	7.1	171.4