Microscopic Parameter Extraction and Corresponding Strength Prediction of Cemented Paste Backfill at Different Curing Times

Table 3

Microscopic parameters.

Number	Microparameters	Curing time
		3 d	7 d	14 d	28 d	56 d
1	Image area	1228800	1228800	1228800	1228800	1228800
2	Region number	150	101	146	116	109
3	Total region area	78938	76767	55399	54249	49731
4	Maximum region area	9575	14595	7619	5852	5228
5	Average region area	526.25	760.07	379.45	467.66	456.25
6	Average length	33.03	41.29	29.64	32.35	33.4
7	Porosity	0.0642	0.0625	0.0451	0.0441	0.0405
8	Uniformity coefficient	1.531558	1.753211	1.520978	1.563739	1.536875
9	Sorting coefficient	1.324088	1.201636	1.526259	1.375541	1.333298
10	Curvature coefficient	1.082975	1.394743	0.969289	1.046084	1.071773
11	Fractal dimension	1.2178	1.274	1.2157	0.2606	1.2752
12	Weighted probability entropy	0.9778	0.9557	1.6391	0.9591	0.9541