Design Analysis and Test Verification of Double-Layer Gradient Coating Reinforced Concrete Flexural Strength

Table 2

Performance indicators of the expansion agent.

Inspection item	Fineness		Limited expansion; Rate (%)		Compressive strength (MPa)
	Sieve residue; (1.18 mm); (%)	Specific surface area; (m^2·kg^-1)	In water; (7d)	In air; (21d)	7d	28d
Performance indicator	0	390	0.102	0.034	40.0	53.4