Optimization of Curing Regimes for Precast Prestressed Members with Early-Strength Concrete

International Journal of Concrete Structures and Materials

Table 2 Measured concrete strengths (S in MPa) at different values of T _max and t _eq.

Specimens		\(f_{{{\text{cd}}}}^{\prime}\) (MPa)	T _max (°C)	Equivalent age, t _eq (h)
No.	Name	\(f_{{{\text{cd}}}}^{\prime}\) (MPa)	T _max (°C)	9		12		18		24		36		100		168
1	CL20	30	20	0.2	0.2	1.0	0.9	9.9	9.6	18.0	14.6	23.6	24.8	34.5	33.1	40.8	39.9
2	CL30		30	0.6	0.4	2.6	2.8	6.2	6.2	19.0	17.8	21.1	20.8	33.6	32.2	37.4	37.2
3	CL40		40	0.2	1.3	1.8	1.6	5.8	6.1	14.5	16.8	21.9	22.6	31.2	26.9	35.9	36.7
4	CL50		50	0.9	1.1	3.5	3.5	8.6	9.7	12.6	15.4	21.3	21.1	32.3	31.5	36.2	33.4
5	CL60		60	0.2	0.4	1.5	1.5	7.7	6.3	14.3	16.9	27.8	26.3	32.6	30.5	33.2	32.7
6	CM20	40	20	0.2	0.2	0.9	1.0	13.2	13.1	24.9	23.8	28.3	29.1	43.5	42.2	47.1	49.1
7	CM30		30	0.2	0.3	3.8	2.4	15.5	13.3	24.8	22.8	29.4	30.3	40.4	35.6	46.6	47.3
8	CM40		40	0.4	0.5	1.8	2.0	11.2	12.0	23.4	23.8	28.5	32.4	43.3	36.2	47.7	49.4
9	CM50		50	0.7	0.3	2.3	2.8	13.0	13.3	21.1	22.2	32.1	31.8	43.9	45.8	47.7	45.1
10	CM60		60	0.3	0.5	2.7	3.9	11.4	13.5	23.7	22.0	30.8	31.8	40.1	38.7	47.2	43.5
11	CH20	50	20	0.4	0.4	1.1	1.6	15.3	16.1	25.1	27.5	38.5	37.0	53.6	52.3	57.8	58.1
12	CH30		30	0.2	0.3	1.0	1.2	16.0	17.0	25.9	24.7	32.7	35.3	49.0	51.6	58.3	57.6
13	CH40		40	0.2	0.1	1.0	1.8	11.2	17.2	25.2	25.5	37.7	38.9	54.3	52.6	56.7	58.5
14	CH50		50	0.4	0.4	1.9	4.1	15.9	15.9	28.6	28.5	35.5	35.6	47.2	46.7	53.9	56.1
15	CH60		60	0.2	0.2	2.3	2.1	11.5	13.3	28.4	30.1	40.1	39.0	51.5	49.6	52.2	54.0