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

Table 5

Cost of different strength grades coal gangue-based geopolymer concrete (yuan/m³) (before optimization).

Strength grades	C30	C35	C40	C45	C50
Economic costs	206.52	234.05	256.29	278.71	298.34