Experimental Study of the Pore Structure Deterioration of Sandstones under Freeze-Thaw Cycles and Chemical Erosion

Table 3

Proportional variations of pore sizes in different solutions.

Pore size	Proportion of pores in cores in H2SO4 solution (%)				Proportion of pores in cores in pure water (%)
	0 cycle	10 cycles	20 cycles	30 cycles	0 cycle	10 cycles	20 cycles	30 cycles
Micropores (<0.1 μm)	25.5	24.3	15.7	24.8	17.7	20.9	21.1	22.8
Minipores (0.1–1 μm)	45.8	43.4	47.4	36.5	48.9	41.6	47.1	43.6
Mesopores (1–50 μm)	28.6	32.3	35.6	37.8	33.3	36.4	30.3	31.6
Macropores (≥50 μm)	0.0	0.0	1.4	0.8	0.2	1.2	1.6	2.0