Microstructure Characteristics of GFRP Reinforcing Bars in Harsh Environment

Table 10

Results of OH/CH ratios in control and conditioned GFRP reinforcing bars.

Reference	Resin type	Conditioning				OH/CH
		Medium	Temperature (°C)	Time (days)	Sustained load	Control	Conditioned	% Increase
[8]	Polyester	Alkaline	60	208.3		2.6 & 1.6	14.3 & 3.5	450 & 118.8
[9]	Vinylester	Concrete	50	60		No change		—
[10]	Epoxy	Concrete	60	450		0.59 & 1.07	1.15 & 1.24	94.9 & 15.9
[11]	Epoxy	Concrete	60	288 & 372	x	0.59 & 1.07	1.27 & 1.27	115.3 & 18.7
[13]	Vinylester	Water	50	180		0.45	0.51	13.3
[14]	Vinylester	Concrete	50	240		0.21	0.25	19.0
[23]	Polyester	Alkaline	60	208.3		2.6 & 1.6	14.3 & 3.5	450 & 118.8
[24]	Vinylester	Water	23	90		No change		—
[26]	Vinylester	Alkaline	70	365		No change		—
[27]	Vinylester polyester	Alkaline	60	180		0.49 & 0.48	0.54 & 0.87	22.7 & 81.3
[31]	Epoxy	Alkaline	60	720		No change		—
[34]	Vinylester	Concrete	50	30	x	0.51	0.53	3.9
[35]	Vinylester	Alkaline	73	120	x	1.05	1.45 & 1.30	38.1 & 23.8
[38]	Vinylester	Concrete	30	2920	x	No change		—
[39]	Vinylester	Alkaline	50	365		1.05	1.18	12.4
[40]	Vinylester	Alkaline	22	16.67		No change		—