Effects of Polymer Matrices on Interlaminar Shear Strength of GFRP Rebars in Seawater Sea-Sand Concrete Environment

doi:10.16183/j.cnki.jsjtu.2024.100

Abstract

Abstract:

To investigate the degradation laws and deterioration mechanisms of interlaminar shear strength (ILSS) of glass fiber reinforced polymer (GFRP) rebars with different matrices in seawater and sea-sand concrete (SWSSC) environment, an accelerated corrosion test was conducted on epoxy-based and vinyl ester-based GFRP rebar specimens in a simulated SWSSC pore solution, and then the ILSS tests and scanning electron microscope (SEM) tests were conducted. For epoxy-based GFRP rebars, two kinds of curing agents naming MHHPA and MDA were adopted. The results indicate that the uncorroded MHHPA cured epoxy-based GFRP rebars possesse the highest initial ILSS (42.44 MPa), followed by the vinyl ester-based GFRP rebars (37.10 MPa), while the MDA cured epoxy-based GFRP rebars have the lowest initial ILSS (27.20 MPa). After immersion in a 55 ℃ pore solution environment for 84 d, the ILSS retention of MHHPA cured epoxy-based GFRP rebars is 7.43% while the ILSS retention of MDA cured epoxy-based GFRP and vinyl ester-based GFRP rebars are 39.51% and 71.06% respectively. With the increase in temperature and immersion time in the SWSSC simulated pore solution, the ILSS of three kinds of GFRP rebars all show a declining trend. The reasons for the degradation of ILSS are the interfacial debonding between fibers and matrix and the hydrolytic loss of the matrix. Among the tested specimens, the vinyl ester-based GFRP rebars exhibit the strongest resistance to corrosion in the simulated SWSSC pore solution, while the MHHPA cured epoxy-based GFRP rebars show the weakest resistance with the MDA cured epoxy-based GFRP rebars being intermediate.

Key words: fiberreinforced polymer (FRP), seawater and sea-sand concrete (SWSSC), interlaminar shear strength (ILSS), matrix type, property degradation

CLC Number:

TU599

ZHAO Xuan, ZHAO Qi, ZHANG Daxu, ZHANG Peifu. Effects of Polymer Matrices on Interlaminar Shear Strength of GFRP Rebars in Seawater Sea-Sand Concrete Environment[J]. Journal of Shanghai Jiao Tong University, 2026, 60(3): 452-462.

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组分质量浓度/(g·L^-1)				pH
NaOH	KOH	Ca(OH)₂	NaCl	pH
2.4	19.6	2	35	13.4

GFRP筋种类	浸泡温度/℃	浸泡龄期
GFRP筋种类	浸泡温度/℃	21 d	42 d	63 d	84 d
MHHPA固化环氧基	25	G/E T25D21	G/E T25D42	G/E T25D63	G/E T25D84
	40	G/E T40D21	G/E T40D42	G/E T40D63	G/E T40D84
	55	G/E T55D21	G/E T55D42	G/E T55D63	G/E T55D84
MDA固化环氧基	25	G/P T25D21	G/P T25D42	G/P T25D63	G/P T25D84
	40	G/P T40D21	G/P T40D42	G/P T40D63	G/P T40D84
	55	G/P T55D21	G/P T55D42	G/P T55D63	G/P T55D84
乙烯基	25	G/V T25D21	G/V T25D42	G/V T25D63	G/V T25D84
	40	G/V T40D21	G/V T40D42	G/V T40D63	G/V T40D84
	55	G/V T55D21	G/V T55D42	G/V T55D63	G/V T55D84