Evaluating the Dynamic Elastic Modulus of Concrete Using Shear-Wave Velocity Measurements

Table 2

Summary of statistical analysis.

		Day 4			Day 7			Day 14			Day 28
				COV			COV			COV			COV
[MPa]	Mix 1	25	7.9	4.36	25	10.1	4.32	25	13.9	3.42	25	19.2	4.25
	Mix 2	24	25.1	2.94	25	30.0	3.06	24	37.1	4.23	25	43.1	4.87
	Mix 3	24	23.4	2.83	25	29.3	2.62	25	39.4	4.32	25	44.8	3.63
[GPa]	Mix 1	24	10.1	6.13	25	11.8	4.62	25	14.5	5.31	25	16.9	5.39
	Mix 2	25	16.5	5.35	24	17.7	4.34	25	20.4	3.86	25	23.5	4.57
	Mix 3	24	16.8	5.44	24	18.7	4.23	24	21.5	4.02	24	23.0	3.57
[m/s]	Mix 1	25	3225	2.49	25	3474	1.81	25	3740	1.68	25	3958	1.34
	Mix 2	25	3948	1.51	25	4064	1.41	25	4197	1.07	25	4283	1.03
	Mix 3	25	3894	1.45	25	4055	1.07	25	4195	0.97	25	4302	0.82
[m/s)	Mix 1	—	—	—	22	1664	1.15	25	1790	1.09	25	1936	1.32
	Mix 2	—	—	—	20	2015	1.00	25	2104	0.83	25	2165	0.76
	Mix 3	25	1942	0.93	25	2039	0.90	25	2138	0.90	25	2191	0.87
[Hz]	Mix 1	25	4596	1.56	25	4636	1.37	25	5248	1.21	25	5616	1.25
	Mix 2	25	5602	1.51	25	5752	0.98	25	5990	0.83	25	6178	0.87
	Mix 3	25	5580	1.29	25	5818	1.04	25	6064	1.22	25	6246	1.13
[Hz]	Mix 1	25	3346	3.28	25	3208	1.25	25	3232	1.25	25	3442	1.08
	Mix 2	25	3428	1.89	25	3490	1.49	25	3622	1.32	25	3778	1.32
	Mix 3	25	3412	1.35	25	3532	1.14	25	3678	1.52	25	3796	1.36

Note. = the number of accepted samples used for the statistical analyses; = average of samples; and COV = coefficient of variable (=×100 [%]).