Acoustic Emission Characteristics of Normal and Layered Concrete Blocks during Dilating/Static Fracture

Table 2

The mixing proportions used to create the layered concrete test block [28].

Material	Compressive strength (MPa)	Setting time (min)	Proportion (by weight)	Mass of material (kg)
				High-alumina cement	Portland cement	Quartz powder	Water	Quick setting agent
Sandstone	13	10	1 : 2 : 6.47 : 3.05	1.15	2.30	7.45	3.51	0.104
Sand-shale-1	6	15	1 : 2 : 9 : 4.1	0.88	1.76	7.90	3.60	0.079
Sand-shale-2	4	20	1 : 2 : 14.5 : 6.15	0.59	1.18	8.56	3.63	0.053
Sandstone	13	10	1 : 2 : 6.47 : 3.05	1.15	2.30	7.45	3.51	0.104
Sand-shale-1	6	15	1 : 2 : 9 : 4.1	0.88	1.76	7.90	3.60	0.079
Hard coal	1.6	30	1 : 2 : 25 : 11	0.35	0.69	8.68	3.82	0.031
Sandstone	13	10	1 : 2 : 6.47 : 3.05	1.15	2.30	7.45	3.51	0.104
Sand-shale-1	6	15	1 : 2 : 9 : 4.1	0.88	1.76	7.90	3.60	0.079
Sandstone	13	10	1 : 2 : 6.47 : 3.05	1.15	2.30	7.45	3.51	0.104
Mud shale	3	25	1 : 2 : 17.5 : 7.18	0.50	1.01	8.81	3.62	0.045
Sand-shale-1	6	15	1 : 2 : 9 : 4.1	0.88	1.76	7.90	3.60	0.079
Sandstone	13	10	1 : 2 : 6.47 : 3.05	1.15	2.30	7.45	3.51	0.104