碱冻耦合作用FRP加固混凝土性能损伤机理

doi:10.13229/j.cnki.jdxbgxb.20231016

Abstract

Abstract:

The degradation law of carbon/basalt/glass/aramid fiber-reinforced concrete under strong alkali solution and freeze-thaw coupling was explored. Fiber reinforced polymer （FRP） was used for full reinforcement of cylindrical axial compression members， and local reinforcement was used for prismatic bending members. The mass loss rate， dynamic elastic modulus， pH value change， compressive and flexural strength of the specimens under alkali frost coupling were tested. The results show that carbon fiber and aramid fiber reinforced specimens have better quality loss rate， dynamic elastic modulus， compressive strength loss， plasticity， and flexural bearing capacity loss than glass fiber and basalt fiber reinforced specimens. Based on experimental data， the Lam Teng constitutive model of FRP reinforced concrete with alkali frost coupling effect was modified.

Key words: structural engineering, fiber composite materials, concrete, durability

CLC Number:

TU375

Wen-yuan XU,Wei LI,Da-yang WANG,Yong-cheng JI. Damage mechanism of FRP reinforced concrete under alkali freezing coupling effect[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(6): 2050-2062.

Figures/Tables 27

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Table 10

Revised Lam-Teng model equation"

编号	应力应变曲线
P-C	$σ c = E c ε c - (E c ε c c - f C + f 0) 2 4 f 0 ε c 2$ ， $0 ≤ ε c < ε t$ ； $σ c = f 0 + ε c f C - f 0 ε c c 1$ ， $ε t ≤ ε c ≤ ε c c 1$
P-B	$σ c = E c ε c - (E c ε c c - f B + f 0) 2 4 f 0 ε c 2$ ， $0 ≤ ε c < ε t$ ； $σ c = f 0 + ε c f B - f 0 ε c c 2$ ， $ε t ≤ ε c ≤ ε c c 2$
P-G	$σ c = E c ε c - (E c ε c c - f G + f 0) 2 4 f 0 ε c 2$ ， $0 ≤ ε c < ε t$ ； $σ c = f 0 + ε c f G - f 0 ε c c 3$ ， $ε t ≤ ε c ≤ ε c c 3$
P-A	$σ c = E c ε c - (E c ε c c - f A + f 0) 2 4 f 0 ε c 2$ ， $0 ≤ ε c < ε t$ ； $σ c = f 0 + ε c f A - f 0 ε c c 4$ ， $ε t ≤ ε c ≤ ε c c 4$

Table 10

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材料	强度/MPa	弹性模量/GPa	断裂伸长率/%
CFRP	3 520	267	1.78
BFRP	3 000	120	1.60
GFRP	2 500	80	2.3
AFRP	2 106	117.8	1.75
环氧树脂胶	54.3	2.7	2.25

材料	水	水泥	中砂	碎石
材料	水	水泥	中砂	5~10 mm	10~20 mm
含量	209.0	387.0	635.0	350.7	818.3

纤维布类型	碱冻0次	碱冻50次	碱冻100次
CFRP	P-C-F0	P-C-F50	P-C-F100
BFRP	P-B-F0	P-B-F50	P-B-F100
GFRP	P-G-F0	P-G-F50	P-G-F100
AFRP	P-A-F0	P-A-F50	P-G-F100
对照组	C-0	C-50	C-100

组别	质量/kg
组别	冻融0次	冻融50次	冻融100次
P-C	3.645	3.655	3.664
P-G	3.595	3.614	3.623
P-B	3.65	3.662	3.671
P-A	3.645	3.669	3.679
对照组	3.565	3.575	3.425

组别	质量/kg
组别	冻融0次	冻融50次	冻融100次
P-C	9.565	9.575	9.500
P-B	9.615	9.644	9.498
P-A	9.650	9.674	9.566
P-G	9.345	9.383	9.213
对照组	9.450	9.498	9.298

Damage mechanism of FRP reinforced concrete under alkali freezing coupling effect

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