Experimental Investigation of the Effects of Concrete Alkalinity on Tensile Properties of Preheated Structural GFRP Rebar

Table 2

Tensile strength and elastic modulus.

Specimen ID	Mean (MPa)				SD (MPa)				CoV (%)
	0 days	100; days	300; days	660; days	0 days	100; days	300; days	660; days	0 days	100; days	300; days	660; days
	Tensile strength
Ref	644.7	574.8	183.0	114.9	24.3	47.7	8.7	29.3	3.8	8.3	4.7	25.5
PH_120	643.7	582.0	162.8	125.6	38.4	60.2	29.9	23.9	6.0	10.3	18.4	31.9
PH_200	612.8	503.7	159.6	120.7	27.6	47.7	18.0	17.1	4.5	9.5	11.3	14.1
	Elastic modulus
Ref	53.4	52.0	17.6	16.4	6.8	3.9	1.7	2.7	12.7	7.4	9.8	16.5
PH_120	52.0	51.0	16.2	16.0	3.0	3.2	1.7	2.1	5.7	6.3	10.3	13.1
PH_200	50.2	49.6	16.4	15.2	3.5	3.8	1.3	2.2	6.9	8.0	7.6	14.2