固化与试验温度对环氧树脂及表层嵌贴CFRP-混凝土界面粘结性能的影响

龚爽; 林福宽; 粟淼; 张建仁; 彭晖

doi:10.13801/j.cnki.fhclxb.20220801.001

固化与试验温度对环氧树脂及表层嵌贴CFRP-混凝土界面粘结性能的影响

doi: 10.13801/j.cnki.fhclxb.20220801.001

龚爽¹,
林福宽¹,
粟淼¹,
张建仁^{1, 2},
彭晖^{1, 2, ,}

1.
长沙理工大学　土木工程学院，长沙 410014
2.
桥梁工程安全控制教育部重点实验室，长沙 410014

基金项目: 国家自然科学基金(51578078；52178186)

详细信息

通讯作者:
彭晖，博士，教授，博士生导师，研究方向为FRP加固结构、桥梁新材料　E-mail：huipeng@csust.edu.cn

中图分类号: U445.6
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- 文章访问数: 636
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- 被引次数: 0
出版历程
- 收稿日期: 2022-05-31
- 修回日期: 2022-07-12
- 录用日期: 2022-07-19
- 网络出版日期: 2022-08-04
- 刊出日期: 2022-11-01

Effect of curing and ambient temperature on properties of epoxy resin and bond behavior of near-surface-mounted CFRP-concrete interface

GONG Shuang¹,
LIN Fukuan¹,
SU Miao¹,
ZHANG Jianren^{1, 2},
PENG Hui^{1, 2
, ,}

1.
School of Civil Engineering, Changsha University of Science & Technology, Changsha 410014, China
2.
Key Laboratory for Safety Control of Bridge Engineering, Ministry of Education and Hunan Province, Changsha 410014, China

摘要

摘要: 表层嵌贴碳纤维增强复合材料(CFRP)加固混凝土结构中的环氧树脂粘结剂具有一定的温度敏感性，试验研究了不同固化温度和试验环境温度下环氧树脂力学性能及其在加固结构中的粘结性能，结果表明：(1) 固化温度的升高大幅缩短了环氧树脂固化时间，对其拉伸强度和剪切强度的影响较小，拉伸强度仅在固化温度超过80℃时小幅下降，降幅在10%以内；试验环境温度的升高会引起环氧树脂软化，导致其拉伸强度和剪切强度显著降低；固化温度更高的环氧树脂在60℃甚至更高试验环境温度下剪切性能更稳定；(2) 固化温度对表层嵌贴CFRP加固构件的界面粘结性能影响较小，但界面粘结性能随着试验环境温度的升高而显著下降，最大降幅约为58.89%，破坏模式也由混凝土内聚破坏转变为环氧树脂-混凝土界面破坏和CFRP-环氧树脂界面破坏；固化温度更高的试件在高试验环境温度下表现出更高的粘结强度。在试验基础上拟合了加固试件界面的粘结-滑移本构曲线，并建立了曲线特征参数与试验环境温度的关系。
- 环氧树脂 /
- 表层嵌贴 /
- 固化温度 /
- 试验环境温度 /
- 粘结性能 /
- 粘结-滑移关系
Abstract: Epoxy resin in near-surface-mounted (NSM) carbon fiber reinforced polymer (CFRP) reinforced concrete structure has a certain temperature sensitivity. The properties of epoxy resin and its bond behavior in the reinforced structure were experimentally studied at different curing temperatures and ambient temperatures. The results show that: (1) The curing time of epoxy resin is greatly shortened with the increase of curing temperature, and has little effect on its tensile strength and shear strength, the tensile strength only decreases slightly by about 10% when curing temperature exceeds 80℃. But the tensile strength and shear strength of epoxy resin decrease obviously with the increase of ambient temperature. Epoxy resins with higher curing temperatures have more stable shear properties at 60℃ or higher ambient temperatures; (2) The effect of curing temperature on the CFRP-concrete interface bond property of NSM CFRP reinforced components is small, but the interfacial bond behavior decreases with the increase of ambient temperature, and the maximum reduction is about 58.89%. The failure mode also changes from concrete cohesive failure to epoxy resin-concrete interface failure and CFRP-epoxy interface failure. The specimen with higher curing temperature shows higher bonding strength at high ambient temperature. In addition, the bond-slip curves of the specimen interface are fitted on the basis of the test, and the relationship between the characteristic parameters of the curve and the ambient temperature is established.
- epoxy resin /
- near-surface-mounted (NSM) /
- curing temperature /
- ambient temperature /
- bond behavior /
- bond-slip model

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图 1 环氧树脂拉伸与剪切性能测试试件

R—Chamfer radius between adjacent sections of the specimen

Figure 1. Epoxy specimen for tensile and shear properties

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图 2 单剪拉拔试验

Figure 2. Pull-out experiment

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图 3 固化温度对环氧树脂拉伸强度的影响

Figure 3. Effect of curing temperature on tensile strength of epoxy

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图 4 环氧树脂固化温度-固化时间曲线

Figure 4. Curing temperature-curing time curve of epoxy

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图 5 试验环境温度对环氧树脂拉伸性能影响

Figure 5. Effect of ambient temperature on tensile properties of epoxy

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图 6 试验环境温度对环氧树脂剪切性能影响

Figure 6. Effect of temperature on shear performance of epoxy

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图 7 表层嵌贴CFRP-混凝土典型破坏模式

Figure 7. Typical failure mode of near-surface-mounted CFRP-concrete

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图 8 P1-C100-T20 试件界面测试结果

Figure 8. Interface test results of P1-C100-T20

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图 9 不同试验环境温度下表层嵌贴CFRP-混凝土试件破坏模式

Figure 9. Failure modes of near-surface-mounted CFRP-concrete under different ambient temperatures

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图 10 P2-C20-T80应变和粘结应力

Figure 10. Strain and shear stress of P2-C20-T80

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图 11 试验环境温度组表层嵌贴CFRP-混凝土数据分析

Figure 11. Analysis of ambient temperature group data of near-surface-mounted CFRP-concrete

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图 12 表层嵌贴CFRP-混凝土破坏荷载-试验环境温度曲线

Figure 12. Failure load-ambient temperature curves of near-surface-mounted CFRP-concrete

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图 13 固化温度对环氧树脂玻璃化转变温度影响

Figure 13. Effect of curing temperature on epoxy glass transition temperature

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图 14 表层嵌贴CFRP-混凝土粘结-滑移曲线拟合

Figure 14. Fitting of shear stress-slip curves of near-surface-mounted CFRP-concrete

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图 15 表层嵌贴CFRP-混凝土参数拟合

Figure 15. Parameter simulation of near-surface-mounted CFRP-concrete

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表 1 材料性能

Table 1. Mechanical performance

Material parameter	Epoxy resin	CFRP
Tensile strength/MPa	40	2564.3
Elasticity modulus/GPa	3.2	140.7
Elongation at break/%	1.5	1.96
Bonding strength/MPa	60	–
Compressive strength/MPa	70	–
Standard value of tensile shear strength of steel to steel/MPa	14	–
Tensile strength of epoxy to concrete/MPa	2.5	–
Notes: Epoxy resin was cured at 23℃ for 7 days, and then tested at 23℃; CFRP—Carbon fiber reinforced polymer.

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表 2 试验工况

Table 2. Test conditions

Experiment	Curing temperature/℃	Curing time/h	Ambient temperature/℃	Purpose
Quasi static tensile test (Tensile test)	100	0.5, 1, 1.5, 2	20	The influence of curing temperature on the tensile properties of epoxy resin, and the optimum curing time corresponding to each curing temperature.
	90	0.5, 1, 1.5, 2, 3
	80	0.5, 1, 1.5, 2, 3, 4
	70	0.5, 1, 1.5, 2, 3, 4, 6
	60	1, 2, 3, 4, 6, 8, 10
	50	1, 2, 3, 4, 6, 8, 10, 12
	40	12, 16, 20, 24, 28
	20 (Standard)	24, 36, 48, 60, 72, 96
	0	24, 48, 72, 96
Quasi static tensile test (Shear test)	100	1.3	20, 30, 40, 50, 60, 70, 80	The effects of curing temperature and ambient temperature on shear properties of epoxy resin.
	80	2
	60	5
	40	24
	20 (Standard)	72
Note: Considering the weather condition during the test, the curing condition at room temperature was set at 20℃.

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表 3 试验参数设计

Table 3. Design of test parameters

Specimen	Curing temperature/℃	Curing time/h	Ambient temperature/℃
P-C20-T20	20	96	20
P1-C40-T20	40	24
P1-C60-T20	60	5
P1-C80-T20	80	2
P1-C100-T20	100	1.3
P2-C20-T40	20	96	40
P2-C20-T60			60
P2-C20-T80			80
P3-C80-T40	80	2	40
P3-C80-T60			60
P3-C80-T80			80
Notes: P-C20-T20—Control specimen; P1—Curing temperature group; P2—Ambient temperature group; P3—Heat resistance group; C and T are curing and ambient temperature respectively, followed by the number is the specific value.

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表 4 固化温度组表层嵌贴CFRP-混凝土试验结果

Table 4. Test results of near-surface-mounted CFRP-concrete in curing temperature group

Specimen	Curing temperature/℃	Curing time/h	Failure load/kN	Maximum shear stress/MPa	Failure mode
P-C20-T20	20	96	90.0	16.07	CC+RC
P1-C40-T20	40	24	92.5	16.28	CC+RC
P1-C60-T20	60	5	87.5	15.55	CC+RC
P1-C80-T20	80	2	90.0	15.41	CC+RC
P1-C100-T20	100	1.3	87.5	17.15	CC+RC
Notes: CC—Cohesive failure of concrete; RC—Interface failure of epoxy resin to concrete.

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表 5 试验环境温度组表层嵌贴CFRP-混凝土试验结果

Table 5. Test results of near-surface-mounted CFRP-concrete in ambient temperature group

Specimen	Softening degree	Failure load/kN	α_L/%	Maximum shear stress/MPa	α_S/%	Failure mode	Decrease
P-C20-T20	No	90.0	0.00	16.07	0.00	CC	100.00%
P2-C20-T40	Slight	60.0	33.33	12.27	23.65	RC+CC	66.67%
P2-C20-T60	Significant	42.5	52.78	9.57	40.45	RC	47.22%
P2-C20-T80	Severe	37.0	58.89	8.56	46.73	FR	41.11%
Notes: FR—CFRP to epoxy resin interface failure; α_L and α_S—Decreasing amplitude of the failure load and shear stress of the specimen relative to P-C20-T20.

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表 6 耐高温性能组表层嵌贴CFRP-混凝土试验结果

Table 6. Test results of near-surface-mounted CFRP-concrete for heat resistance group

Specimen	Curing temperature/℃	Ambient temperature/℃	Failure load/kN	α_T/%	Failure mode
P-C20-T20	20	20	90.0	0.00	CC
P3-C80-T20	80	20	90.0	0.00	CC
P2-C20-T40	20	40	60.0	16.67	RC+CC
P3-C80-T40	80	40	70.0	16.67	CC
P2-C20-T60	20	60	42.5	11.76	RC
P3-C80-T60	80	60	47.5	11.76	RC
P2-C20-T80	20	80	37.0	8.11	FR
P3-C80-T80	80	80	40.0	8.11	RC
Note: α_T—Increasing amplitude of specimen cured at 80℃ compared with those cured at 20℃.

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