Effect of SiO₂ Methyl Modification on the Performance of Nondispersible Underwater Concrete and Reinforcement Mechanism

Table 10

Compressive strength data for various doses of CH₃-NS and concrete ages (MPa).

Dosage of CH3-NS (%)	1d Compressive strength		3d Compressive strength		7d Compressive strength		28d Compressive strength
	In-air	Underwater	In-air	Underwater	In-air	Underwater	In-air	Underwater
1	24.5	17.8	25.6	19.9	45.2	34.5	56.9	45.2
3	15.0	12.0	20.1	15.6	42.0	33.2	49.8	40.2
5	19.4	14.5	21.6	16.5	40.8	32.0	52.6	43.8
7	20.1	16.8	24.2	17.8	41.6	35.0	54.8	45.8
9	23.1	17.6	27.8	20.0	43.9	36.9	57.0	47.6