Influence of Multistage Target Temperature and Cyclic Loading/Unloading on the Permeability of Polypropylene Fiber Concrete

Table 4

Permeability decline rate of the specimen during loading.

State of stress	Stress ratio (R)	Permeability decline rate (kD/%)
		22°C	40°C	80°C	120°C	160°C	200°C	240°C	280°C
Cyclic loading process	0.10	8	8	7	6	7	6	6	5
	0.17	9	8	8	7	8	6	6	5
	0.23	10	9	8	8	8	6	6	5
	0.30	10	10	9	8	8	5	5	5
	0.37	9	10	9	9	7	5	2	2
	0.43	8	8	7	7	4	3	1	1
	0.50	6	5	3	4	2	1	1	1
Single loading process	0.10	9	9	8	8	7	7	7	6
	0.17	9	9	9	8	9	7	6	5
	0.23	10	10	9	9	8	7	6	5
	0.30	11	10	10	9	8	6	6	5
	0.37	11	11	9	10	7	5	3	3
	0.43	10	10	8	8	5	3	2	2
	0.50	7	6	5	5	4	3	2	2