Research on Carbonation Characteristics and Frost Resistance of Iron Tailings Powder Concrete under Low-Cement Clinker System

Table 5

Natural carbonization depth of concrete (mm).

Group	Carbonation depth after 1 d curing						Carbonation depth after 28d curing
	28 d	90 d	180 d	360 d	720 d	1080 d	28 d	90 d	180 d	360 d	720 d	1080 d
A1	2.4	3.1	3.9	6.0	9.8	11.9	0	0.1	0.4	0.8	1.1	1.4
A2	2.5	3.6	5.1	7.4	12.2	13.6	0	0.2	0.8	1.1	1.6	1.9
A3	3.0	4.7	5.4	7.5	12.6	14.8	0.1	0.3	1.0	1.2	1.8	2.4
A4	4.5	6	6.6	9.1	14.8	17.1	0.3	0.5	1.2	1.5	2.5	2.9
A5	6.1	8.6	9.3	11.9	18.6	22.5	0.4	0.8	1.4	2.4	3.6	4.1
B1	1.1	1.9	2.2	3.5	5.6	6.8	0	0	0	0.3	0.8	0.9
B2	1.8	3.0	3.9	5.2	8.8	10.7	0	0	0.3	0.8	1.4	1.6
B3	2.6	3.5	4.2	5.5	10.1	12.6	0	0.1	0.5	0.9	1.6	1.8
B4	2.8	3.8	4.8	7.8	12.7	15.5	0	0.2	1.0	1.5	2.1	2.4
B5	3.3	5.4	6.5	9.4	15.6	18.8	0.2	0.6	1.1	2.1	2.9	3.3