Effect of Curing Temperature Histories on the Compressive Strength Development of High-Strength Concrete

Table 3

Summary of test results.

Specimen	Mixture type	Temperature history (°C)	(h)	(h)	(J/mol)	(day^−1)	(J/mol)	Compressive strength (, in MPa) at different ages (days)
								1	3	7	13	22	28	56	91
I-C	I		17.2	25.2	23204	0.13	43332	—	12.4	29.5	42.0	46.8	48.2	53.3	55.6
I-R			11.5	15.6		0.26		5.3	25.6	37.0	45.5	47.5	48.7	51.9	52.0
I-H			5.0	9.0		0.88		22.0	44.7	48.0	52.0	56.0	58.0	58.5	59.1
I-R(1)C								5.3	17.1	30.4	39.7	46.9	48.1	51.3	53.6
I-R(3)C			—	—		—		5.3	25.6	39.8	45.6	48.0	49.4	50.6	50.9
I-R(7)C								5.3	25.6	40.0	44.8	48.6	50.3	52.3	52.8
II-C	II		13.5	23.2	20304	0.22	41777	0.5	22.1	41.1	53.5	58.9	61.5	63.9	66.3
II-R			9.6	14.7		0.49		11.5	40.4	50.0	57.0	63.9	64.4	65.4	65.4
II-H			7.0	9.4		1.41		32.2	61.2	65.7	65.9	66.3	66.5	66.8	66.9
II-R(1)C								11.5	29.9	49.1	54.8	59.3	61.8	64.8	69.3
II-R(3)C			—	—		—		11.5	40.4	48.6	56.4	60.8	62.1	63.5	63.8
II-R(7)C								11.5	40.4	50.0	58.8	62.4	63.5	65.3	65.7

Note: = initial setting time, = final setting time, = apparent activation energy at final setting time, = rate constant at given temperature, and = initial apparent activation energy at hardening phase.
For specimen notation under isothermal condition, the first and second parts refer to the mixture type and curing temperature, respectively. Specimen notation under terraced history includes the following identifications: the first part gives the mixture type, the second letter and third figure refer to initial curing temperature and the corresponding period, respectively, and the fourth part denotes the subsequent curing temperature. Curing temperature is identified by abbreviations C, R, and H, which represent cold (5°C), reference (20°C), and hot (40°C) conditions, respectively.