Effect on mechanical properties of glass⁃fiber⁃reinforcement polymer bars exposure to alkaline solution under natural ambient temperature

doi:10.19491/j.issn.1001-9278.2022.02.014

Abstract

Abstract:

In this study， the mechanical properties of glass fiber reinforcement polymers bars （GFRP） were investigated after subjected to dry?wet cycles and static immersion of alkaline solution for different days， and the reduction law of mechanical properties was analyzed. Based on the life prediction formula of durability of GFRP， a strength reduction model for the GFRP with a diameter of 20 mm subjected to the alkaline solution was obtained through linear fitting， and the model was used to predict the variation trend of long?term tensile properties of GFRP. The results indicated that the tensile strength of GFRP decreased significantly with an increase in the duration time of dry?wet cycles in the alkaline solution. The strength reduction mainly occurred in the first 90 days， and the GFRP with a diameter of 20 mm showed a faster initial strength reduction than that with a diameter of 25 mm. After a certain period， the reduction became slower， and however the stress?strain relationship was almost same. There was a size effect on the long?term alkali resistance of GFRP， being associated with the action mode of the alkaline solution.

Key words: natural environment, glass fiber reinforcement polymer bar, alkaline solution, mechanical property, degradation model

CLC Number:

TQ327.1

JIN Qingping, YI Jianming, GAO Yonghong, CAO Nannan, DENG Siyuan. Effect on mechanical properties of glass⁃fiber⁃reinforcement polymer bars exposure to alkaline solution under natural ambient temperature[J]. China Plastics, 2022, 36(2): 89-95.

Figures/Tables 12

Fig.1. Corrosion device for the specimens

Fig.2. Image of GFRP with different diameter after wet and dry cycle alkaline corrosion for 180 d

筋体直径/mm	腐蚀时间/d	拉伸强度/MPa	弹性模量/GPa	拉伸强度保留率/%	弹性模量比/%
20	0	694.7	46.0	100	100
	30	630.4	52.8	90.8	114.8
	90	572.7	42.0	82.4	91.3
	150	533.7	43.59	76.8	94.7
	180	555.8	43.2	76.8	93.9
25	0	716.2	45.4	82.4	91.3
	30	691.5	50.4	84.8	85.9
	90	602.3	39.0	76.8	93.9
	180	555.8	40.4	77.5	89.0

Tab.1. Tensile properties of GFRP after wet and dry cycle alkaline corrosion

Fig.3. Tensile strength degradation of GFRP with different diameter

Fig.4. Decay rate of tensile strength of GFRP with different diameter

Fig 5. Stress?strain curves of GFRP with different diameter

Fig.6. SEM images of GFRP of GFRP before and after corrosion

Fig.7. Reaction equation

浸泡时间/d	拉伸强度/MPa	拉伸强度保留率/%
0	694.7	100.0
30	636.8	91.7
90	549.6	79.1
150	498.0	71.7
180	497.9	71.7

Tab.2. Tensile properties of GFRP with diameter of 20 mm after static immersion corrosion of alkaline solution

Fig.8. Tensile strength retention rate?corrosion time curves of GFRP with diameter of 20 mm

Fig.9. Fitting degradation model of tenslie strength of GFRP

作用方式	时长/年	拉伸强度保留率/%
干湿循环	50	41
干湿循环	100	35
静止浸泡	50	20
静止浸泡	100	12

Tab.3. Prediction of tensile strength of GFRP with diameter of 20 mm

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