树脂涂层及海水浸泡对玄武岩纤维织物增强海水海砂混凝土力学性能的影响

朱德举; 黄伟; 郭帅成

树脂涂层及海水浸泡对玄武岩纤维织物增强海水海砂混凝土力学性能的影响

湖南大学土木工程学院绿色先进土木工程材料及应用技术湖南省重点实验室, 长沙 410082

基金项目: 国家自然科学基金山东联合基金项目(U1806225)

详细信息

通讯作者:
朱德举，博士，教授，博士生导师，研究方向为生物材料多尺度力学行为及仿生、高性能纤维/织物增强水泥基和树脂基复合材料、防弹高性能纤维布的力学特性和有限元分析、冲击和高应变率试验技术　E-mail:dzhu@hnu.edu.cn

中图分类号: TB332;TU599
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- 被引次数: 0
出版历程
- 收稿日期: 2023-09-20
- 修回日期: 2023-10-24
- 录用日期: 2023-11-21
- 网络出版日期: 2023-12-01

Effects of resin coating and seawater immersion on mechanical performance of basalt textile reinforced seawater sea sand concrete

Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China

Funds: National Natural Science Foundation of China-Shandong Joint Fund (U1806225)

摘要

摘要: 为了研究不同树脂(环氧树脂、呋喃树脂、乙烯基树脂)涂层及海水浸泡对玄武岩纤维织物增强海水海砂混凝土(BTR-SSC)力学性能的影响，采用万能试验机对各树脂涂层纤维束和海水浸泡不同时间下BTR-SSC试件进行静态拉伸试验，并通过拔出试验评估纤维-基体界面黏结性能。结合数字图像相关分析得到裂纹与应变分布，并采用扫描电镜分析损伤机理。通过界面黏结强度计算公式实现以裂纹分布和基体强度评估界面长期性能。结果表明：三种树脂对纤维束的增强效果显著且相近(32%左右)，均可显著提升BTR-SSC力学性能，乙烯基树脂涂层表现最佳，抗拉性能和界面黏结性能分别提升77%和180%。海水浸泡下BTR-SSC试件力学性能明显劣化，未处理试件仅高温浸泡14 d后便脆断，环氧树脂、呋喃树脂和乙烯基树脂涂层试件浸泡7 d时相对未处理试件抗拉强度分别提升81%、48%和94%，浸泡28 d时仍呈多裂缝开展，界面黏结性能分别损失64%、57%和55%。该成果将有助于提升BTR-SSC在海洋环境中长期性能并促进其在海工结构中的应用。
- 织物增强混凝土 /
- 海水海砂混凝土 /
- 表面处理 /
- 海水浸泡 /
- 力学性能
Abstract: In order to study the effects of different resin (epoxy resin, furan resin, vinyl resin) coatings and seawater immersion on the mechanical properties of basalt textile reinforced seawater sea sand concrete (BTR-SSC), a universal testing machine was used to perform static tensile tests on the fiber yarns of each resin coating and the BTR-SSC specimens immersed in seawater for different time, and the fiber-matrix interface bonding performance was evaluated by pull-out test. The crack and strain distribution were obtained by digital image correlation analysis, and the damage mechanism was analyzed by scanning electron microscopy. The long-term performance of the interface was evaluated by crack distribution and matrix strength through the calculation formula of interface bond strength. The results show that the reinforcing effects of the three resins on the fiber yarns are significant and similar (around 32%), which could significantly improve the mechanical properties of BTR-SSC. The vinyl resin coating had the best performance, and the tensile properties and interfacial bonding properties are increased by 77% and 180%, respectively. The mechanical properties of BTR-SSC specimens are significantly degraded under seawater immersion. The untreated specimens are brittle after 14 days of high temperature immersion. The tensile strength of epoxy resin, furan resin and vinyl resin coated specimens increase by 81%, 48% and 94% respectively after 7 days of immersion compared with untreated specimens. After 28 days of immersion, there are still multiple cracks developed, and the interfacial bonding properties are lost by 64%, 57% and 55%, respectively. The results will help to improve the long-term performance of BTR-SSC in the marine environment and promote its application in marine structures.
- textile reinforced concrete /
- seawater sea sand concrete /
- surface treatment /
- seawater immersion /
- mechanical performance

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图 1 不同树脂涂层玄武岩纤维织物外观图

Figure 1. Surface morphology of basalt textile coated with different resins

'CG' represents the untreated specimen, namely the control group, 'ER' represents the specimen coated with epoxy resin, 'FR' represents the specimen coated with furan resin, and 'VR 'represents the specimen coated with vinyl resin

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图 2 不同树脂涂层试件纤维束横截面

Figure 2. Cross section of fiber yarns in specimens with different resin coatings

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图 3 TRC拉伸试件(a)与拔出试件(b)

Figure 3. Tensile specimen of TRC(a) and pull-out specimen(b)

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图 4 不同树脂涂层玄武岩纤维束拉伸荷载-位移曲线

Figure 4. Tensile load-displacement curves of basalt fiber yarns with different resin coatings

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图 5 不同海水浸泡时间下不同树脂涂层BTR-SSC拉伸应力-应变关系曲线

Figure 5. Tensile stress-strain relationship curves of BTR-SSC with different resin coatings immersed in seawater for different time

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图 6 海水浸泡对不同树脂涂层BTR-SSC抗拉力学性能的影响

Figure 6. Effect of seawater immersion on tensile mechanical performance of BTR-SSC with different resin coatings

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图 7 不同海水浸泡时间下不同树脂涂层BTR-SSC裂纹和纵向应变分布

Figure 7. Cracks and longitudinal strain distribution of BTR-SSC with different resin coatings immersed in seawater for different time

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图 8 不同海水浸泡时间下不同树脂涂层BTR-SSC的平均裂纹数量和裂纹间距

Figure 8. Average crack number and average crack spacing of BTR-SSC with different resin coatings immersed in seawater for different time

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图 9 不同树脂涂层玄武岩纤维束拔出荷载-滑移曲线

Figure 9. Pull-out load-slip curves of basalt fiber yarns with different resin coatings

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图 10 不同树脂涂层BTR-SSC剪切黏结强度与等效黏结强度线性拟合

Figure 10. Linear fitting diagram of shear bond strength and equivalent bond strength of BTR-SSC with different resin coatings

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图 11 海水浸泡对不同树脂涂层BTR-SSC界面黏结性能的影响

Figure 11. Effect of seawater immersion on the interfacial bonding performance of BTR-SSC with different resin coatings

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图 12 海水浸泡28 d后不同树脂涂层BTR-SSC试件纤维微观形貌

Figure 12. Fiber micromorphology of BTR-SSC specimens with different resin coatings after seawater immersion for 28 days

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图 13 未浸泡时及海水浸泡28 d后BTR-SSC试件树脂表面微观形貌

Figure 13. Microscopic morphology of resin surface of BTR-SSC specimens before immersion and after seawater immersion for 28 days

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表 1 玄武岩纤维丝的物理及力学性能参数

Table 1. Physical and mechanical parameters of basalt fiber filaments

Type	Specification	Tensile strength/ MPa	Elastic modulus/ GPa	Elongation /%	Diameter /μm
Basalt fiber	3 K	1650	85	3	12

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表 2 树脂的物理及力学性能参数

Table 2. Physical and mechanical parameters of resins

Type	Model	Initial viscosity after mixing/(mPa·s)	Tensile strength/ MPa	Breaking Elongation/%	Mass ratio
Type	Model	Initial viscosity after mixing/(mPa·s)	Tensile strength/ MPa	Breaking Elongation/%	Resin∶Curing agent∶ Accelerator
Epoxy resin	JN-LS	70	46	8	100∶40
Vinyl resin	CHEMPULSE 901	350±100	76-90	5-6	100∶1.2∶0.2
Furan resin	GM-2	200±100	5-15	3-4	100∶2

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表 3 海水海砂混凝土配合比(kg/m³)

Table 3. Mix proportion of the seawater sea sand concrete(kg/m³)

Water-binder ratio	Cement	Fly ash	Seawater	Sea sand(0-1.2 mm)		Defoamer	Superplasticizer	Suspension stabilizer
Water-binder ratio	Cement	Fly ash	Seawater	0-0.6 mm	0.6-1.2 mm	Defoamer	Superplasticizer	Suspension stabilizer
0.37	643	161	299	364	728	1.6	1.45	0.4

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表 4 人工海水的化学组成

Table 4. Chemical composition of artificial seawater

Solvent	NaCl	MgCl₂	Na₂SO₄	CaCl₂	KCl	NaHCO₃
Concentration /(g·L⁻¹)	24.53	5.2	4.09	1.16	0.695	0.201

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表 5 不同树脂涂层玄武岩纤维束抗拉力学性能参数

Table 5. Tensile mechanical performance parameters of basalt fiber yarns with different resin coatings

Specimen ID	Ultimate load/N	Tensile strength /MPa	Ultimate strain /%
CG	331.4(8.4)	1077(27)	3.17(0.12)
ER	456.5(13.3)	1484(43)	4.23(0.12)
FR	434.1(6.6)	1411(22)	4.04(0.17)
VR	426.3(6.5)	1385(21)	4.09(0.03)
Note: The values in the parentheses are standard deviations.

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表 6 不同海水浸泡时间下不同树脂涂层BTR-SSC抗拉力学性能参数

Table 6. Tensile mechanical performance parameters of BTR-SSC with different resin coatings immersed in seawater for different time

Specimen ID	Immersion time/days	First crack stress/MPa	Tensile strength /MPa	Strength retention rate /%	Peak strain /%	Toughness /MPa	Crack number	Crack spacing /mm
CG-0	0	3.79(0.68)	4.86(0.26)	-	0.58(0.36)	0.036(0.010)	3.3(0.5)	34(9)
ER-0		3.85(0.51)	7.82(0.25)	-	1.71(0.11)	0.096(0.010)	6(0)	20(1)
FR-0		3.30(0.25)	6.35(0.54)	-	1.26(0.29)	0.063(0.017)	6(0)	20(1)
VR-0		4.44(0.34)	8.61(0.56)	-	1.77(0.35)	0.109(0.025)	7.3(0.6)	16(2)
CG-7	7	2.66(0.61)	2.72(0.52)	56	0.12(0.16)	0.006(0.001)	1.3(0.6)	34(0)
ER-7		3.39(1.00)	4.93(0.02)	63	0.78(0.12)	0.031(0.007)	3(0)	34(5)
FR-7		2.61(0.27)	4.02(0.18)	63	0.45(0.13)	0.018(0.001)	3(1)	29(5)
VR-7		2.88(1.42)	5.28(0.40)	61	1.32(0.10)	0.051(0.008)	3.7(0.6)	33(5)
CG-14	14	3.26(0.59)	3.26(0.59)	brittle failure	0.04(0.02)	0.001(0.001)	1(0)	-
ER-14		3.31(0.17)	4.57(0.56)	58	0.88(0.14)	0.035(0.007)	3.7(0.6)	33(4)
FR-14		3.38(0.43)	3.54(0.23)	56	0.23(0.18)	0.011(0.004)	2(1)	48(14)
VR-14		3.14(0.71)	4.90(0.23)	57	1.09(0.25)	0.044(0.006)	5(1)	23(2)
CG-28	28	2.99(0.46)	2.99(0.46)	brittle failure	0.03(0.00)	0.001(0.000)	1(0)	-
ER-28		2.81(0.27)	3.93(0.54)	50	0.70(0.44)	0.033(0.017)	3.3(1.2)	39(14)
FR-28		2.37(0.55)	2.91(0.12)	46	0.31(0.09)	0.010(0.002)	3(1)	32(11)
VR-28		2.49(0.78)	4.02(0.61)	47	0.94(0.14)	0.029(0.004)	4.7(1.2)	25(5)
Note: The values in the parentheses are standard deviations.

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表 7 不同树脂涂层玄武岩纤维束拔出力学性能

Table 7. Pull-out mechanical performance of basalt fiber yarns with different resin coatings

Specimen ID	Pull-out stiffness /(N·mm⁻¹)	Ultimate pull- out force /N	τ_m /MPa	Pull-out work /10⁻³ J
CG	304(16)	56(3)	1.41	13.3(13.3)
ER	253(40)	122(6)	2.23	55.6(2.9)
FR	337(30)	119(3)	2.05	71.7(10.8)
VR	369(50)	157(1)	2.76	113.1(1.5)
Note: The values in the parentheses are standard deviations.

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表 8 不同海水浸泡时间下不同树脂涂层BTR-SSC界面黏结性能计算参数

Table 8. Parameters required for the calculation of interfacial bonding performance of BTR-SSC with different resin coatings immersed in seawater for different time

Specimen ID	σ_mu/MPa	x/mm	r/mm	V_f/%	K₁	τ_s/MPa
CG-0	3.8	34	0.313	1.03	1.31	1.71
ER-0		20	0.436	1.84	0.99	2.24
FR-0		20	0.461	2.06	1.05	2.11
VR-0		16	0.453	1.98	0.82	2.69
CG-7	2.9	34	0.313	1.03	1.31	1.28
ER-7		34	0.436	1.84	1.68	0.99
FR-7		29	0.461	2.06	1.52	1.09
VR-7		33	0.453	1.98	1.70	0.98
CG-14	3.3	-	0.313	1.03	-	-
ER-14		33	0.436	1.84	1.63	1.16
FR-14		48	0.461	2.06	2.52	0.75
VR-14		23	0.453	1.98	1.18	1.60
CG-28	2.7	-	0.313	1.03	-	-
ER-28		39	0.436	1.84	1.93	0.80
FR-28		32	0.461	2.06	1.68	0.91
VR-28		25	0.453	1.98	1.29	1.20
Notes: σ_mu is the tensile strength of the matrix, x is the average crack spacing, r is the equivalent radius of fiber yarn, V_f is the fiber volume fraction, K₁ is the bond strength factor, τ_s is the shear bonding strength.

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