Microstructure Characteristics of GFRP Reinforcing Bars in Harsh Environment

Table 5

Summary of conditioning regimes in studies investigating the microstructure of GFRP reinforcing bars.

Reference	Surrounding media					Conditioning		Loading
	Alkaline	Concrete	Water	Seawater	Acidic	Duration (days)	Temperature (°C)	Yes (%, UTS^1)	No
[7]			x			40 to 120	23 to 80		x
[8]	x					41.7 to 208.3	60		x
[9]	x	x				30 to 60	−30 to 60		x
[10]		x		x		150 to 450	20 to 60		x
[11]		x		x		150 to 450	20 to 60	25
[12]	x	X				Up to 1445	–	20–65
[13]			x			60 to 180	23 to 50		x
[14]		x	x			60 to 240	23 to 50		x
[15]	x					100 to 660	40		x
[23]	x					41.67 to 208.33	22 to 60		x
[42]				x		90 to 365	23 to 65		x
[24]	x					90	60		x
[25]			x			0.0208 to 0.1285	−100 to 325		x
[26]	x	x				60 to 365	23 to 70		x
[27]	x					30 to 180	23 to 60		x
[28]	x					30 to 270	23	0–25
[29]	x		x	x	x	28 to 50	60 to 80		x
[30]	x		x	x		180 to 540	23 to 50		x
[31]	x					30 to 720	60		x
[32]		x				0.0417 to 0.125	100 to 300		x
[33]	x	x	x			90 to 730	60	20 & x^2
[34]		x	x			60 to 240	23 to 50	20–80
[35]	x		x			30 to 120	20 to 73	19–29
[36]	x		x	x		30 to 132	−25 to 80		x
[37]		x	x	x		180 to 540	23 to 50		x
[38]		x^2				1825 to 2920	−24 to 30	x^2
[39]	x					30 to 365	23 to 75		x
[40]	x		x			54.2	22 to 90		x
[44]	x	x				21 to 42	−18 to 49		x
[45]	x		x			15 to 60	60		x
[46]	x		x			42 to 365	20 to 60	15
[47]		x				30 to 270	20 to 60	10–15
[48]	x					30 to 180	60		x
[49]	x					41.7	60		x
[50]	x					20 to 120	20 to 70		x
[51]			x	x		41.7	20 to 70		x
[52]	x	x	x			90 to 730	60	20 & x^1

¹Ultimate tensile strength. ²Natural weathering conditions.