氯盐侵蚀作用下BFRP筋增强海砂ECC的拉伸及弯曲性能试验

姚淇耀; 陆宸宇; 彭林欣; 滕晓丹; 罗月静

doi:10.13801/j.cnki.fhclxb.20210426.005

氯盐侵蚀作用下BFRP筋增强海砂ECC的拉伸及弯曲性能试验

doi: 10.13801/j.cnki.fhclxb.20210426.005

姚淇耀^1,,
陆宸宇^1,,
彭林欣^{1, 2,},
滕晓丹^{1, 2, 3, ,},
罗月静^{4, 5,}

1.
广西大学　土木建筑工程学院，广西 530004
2.
广西大学　广西防灾减灾与工程安全重点实验室工程防灾与结构安全教育部重点实验室，广西 530004
3.
广西新发展交通集团有限公司，南宁 530028
4.
华蓝设计(集团)有限公司，广西 530011
5.
广西交科集团有限公司，广西 530007

基金项目: 国家自然科学基金(51738004；51878186；11962001)；国家重点研发计划(2019YFC1511103)；中国博士后科学基金(2018M633298)；广西创新驱动重大专项(桂科AA18118055)；广西研究生教育创新计划(YCSW2019048)

详细信息

通讯作者:
滕晓丹，博士，讲师，研究方向为高性能水泥基复合材料　E-mail：xdteng@gxu.edu.cn

中图分类号: TU528.58
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- 文章访问数: 968
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-26
- 修回日期: 2021-04-19
- 录用日期: 2021-04-21
- 网络出版日期: 2021-04-27
- 刊出日期: 2021-03-01

Experimental study on tensile and bending properties of sea sand ECC reinforced by BFRP bars under chloride salt erosion

YAO Qiyao^1
,,
LU Chenyu^1
,,
PENG Linxin^{1, 2
,},
TENG Xiaodan^{1, 2, 3
, ,},
LUO Yuejing^{4, 5
,}

1.
School of Civil Engineering and Architecture, Guangxi University, Guangxi 530004, China
2.
Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Guangxi 530004, China
3.
Guangxi Xinfazhan Communications Group Co. Ltd., Guangxi 530028, China
4.
Hualan Design & Consulting Group, Guangxi 530011, China
5.
Guangxi Transportation Science & Technology Group Co. Ltd., Guangxi 530007, China

摘要

摘要: 为推广使用海洋资源，采用海砂代替硅砂制备工程水泥基复合材料(Engineering cementitious composites, ECC)。将海砂ECC与玄武岩纤维增强树脂复合材料(Basalt fiber reinforced polymer, BFRP) 筋结合，充分发挥两种材料的优点，以获得更强的耐腐蚀性能及更为优异的拉伸性能。通过单轴拉伸及四点弯曲试验，研究了不同侵蚀制度及配筋率对BFRP筋增强海砂ECC的拉伸性能及弯曲性能的影响，并与未配筋的海砂ECC作比较。结果表明，BFRP筋增强海砂ECC的极限拉应力与海砂ECC相比提升了2.46~4.92倍，极限拉应变提升了1.40~2.94倍，干湿循环作用下BFRP筋增强海砂ECC的极限荷载是海砂ECC极限荷载的3.14~4.29倍。不同侵蚀制度下，BFRP筋增强海砂ECC的最佳配筋率均为0.67%。研究的BFRP筋增强海砂ECC可为桥面无缝连接板等设计提供参考。
- Friedel盐 /
- 受弯性能 /
- 拉伸性能 /
- BFRP筋 /
- 海砂 /
- 氯盐侵蚀
Abstract: In order to popularize the use of marine resources, sea sand was used to prepare engineering cementitious composite (ECC) instead of silica sand. By combining sea sand ECC with basalt fiber reinforced polymer (BFRP) bars, the advantages of the two kinds of materials can be fully exploited to obtain higher corrosion resistance and better tensile properties. Through uniaxial tensile and four-point bending tests, the effects of different erosion systems and reinforcement ratio on the tensile and bending properties of BFRP reinforced sea sand ECC were studied, and compared with the sea sand ECC without BFRP reinforcement. The results show that the ultimate tensile stress of BFRP reinforced sea sand ECC is increased by 2.46-4.92 times and the ultimate tensile strain is increased by 1.40-2.94 times compared with the sea sand ECC. The ultimate load of BFRP reinforced sea sand ECC is 3.14-4.29 times of the sea sand ECC without BFRP reinforcement under the effect of dry-wetting cycling. Under different erosion systems, the optimal reinforcement ratio of BFRP reinforced sea sand ECC is 0.67%. The BFRP reinforced sea sand ECC can provide reference for the design of seamless bridge deck.
- Friedel’s salt /
- bending performance /
- tensile performance /
- BFRP bars /
- sea sand /
- chlorine salt erosion

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图 1 BFRP筋单轴拉伸试验

Figure 1. Uniaxial tensile test of BFRP bars

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图 2 单轴拉伸试件尺寸

Figure 2. Size of uniaxial tensile specimens

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图 3 四点弯曲加载装置示意图

Figure 3. Schematic diagram of four-point bending loading device

F—Four-point bending load; LVDT—Displacement meter

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图 4 BFRP筋增强海砂ECC复合板配筋图

Figure 4. Reinforcement of BFRP reinforced sea sand ECC

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图 5 单轴拉伸荷载下海砂ECC与BFRP筋增强海砂ECC复合板的破坏模式对比

Figure 5. Comparison of failure modes between sea sand ECC and BFRP reinforced sea sand ECC under uniaxial tensile loading

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图 6 不同配筋率下BFRP筋增强海砂ECC的弹性模量对比

Figure 6. Comparison of elastic modulus of BFRP bars reinforced sea sand ECC with different reinforcement ratios

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图 7 BFRP筋增强海砂ECC单轴拉伸应力-应变曲线

Figure 7. Uniaxial tensile stress-strain curves of BFRP reinforced sea sand ECC

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图 8 侵蚀制度及配筋率对BFRP筋增强海砂ECC单轴拉伸性能的影响

Figure 8. Effect of erosion system and reinforcement ratio on uniaxial tensile properties of BFRP bars reinforced sea sand ECC

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图 9 BFRP筋增强海砂ECC单轴拉伸性能指标-配筋率的线性拟合

Figure 9. Linear fitting of uniaxial tensile properties of BFRP bars reinforced sea sand ECC-reinforcement ratio

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图 10 四点弯曲荷载下BFRP筋增强海砂ECC的破坏模式对比

Figure 10. Comparison of failure modes of BFRP bars reinforced sea sand ECC under four-point bending

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图 11 BFRP筋增强海砂ECC四点弯曲荷载-位移曲线

Figure 11. Four-point bending load-displacement curves of BFRP reinforced sea sand ECC

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图 12 侵蚀制度及配筋率对BFRP筋增强海砂ECC四点抗弯性能的影响

Figure 12. Effect of erosion systems and reinforcement ratio on four-point bending properties of BFRP bars reinforced sea sand ECC

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图 13 BFRP筋增强海砂ECC韧性指标计算图示

Figure 13. Toughness index of BFRP bars reinforced sea sand ECC calculation diagram

F_cr—First-crack load; δ_cr—First-crack deflection; F_u—Ultimate load; δ_u—Ultimate deflection

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图 14 FRP筋增强海砂ECC复合板受弯性能与配筋率关系曲线

Figure 14. Relation curves between flexural performance and reinforcement ratio of BFRP reinforced sea sand ECC

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图 15 FRP筋增强海砂ECC复合板抗弯强度与弯曲抗裂强度比值-配筋率曲线

Figure 15. Ratio of flexural strength to flexural cracking strength of BFRP reinforced sea sand ECC-reinforcement ratio curves

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表 1 水泥、粉煤灰和偏高岭土的化学成分

Table 1. Chemical composition of cement, fly ash and metakaolin wt%

Material	CaO	SiO₂	Al₂O₃	Fe₂O₃	MgO	SO₃	Na₂O	K₂O	TiO₂	P₂O₅
Cement	63.21	18.48	6.74	3.45	3.24	3.16	0.171	0.533	0.35	0.158
Fly ash	2.58	32.54	24.76	4.92	0.397	1.17	0.523	0.589	0.717	0.251
Metakaolin	0.04	53.29	43.11	0.68	0.22	0.11	0.44	0.42	0.28	0.52

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表 2 聚乙烯醇(PVA)纤维的物理力学性能

Table 2. Physical and mechanical characteristics of polyvinyl alcohol (PVA) fiber

Length/mm	Diameter/μm	Tensile strength/MPa	Elongation/%	Elastic modulus/GPa	Density /(g·cm⁻³)
12	39	1620	7	42.8	1.3

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表 3 玄武岩纤维增强树脂复合材料(BFRP)筋的物理力学性能

Table 3. Physical and mechanical characteristics of basalt fiber reinforced polymer (BFRP) bars

Diameter/ mm	Peak tensile strength/MPa	Elongation/ %	Elastic modulus/GPa	Density/ (g·cm⁻³)	Longitudinal linear expansion coefficient/(10⁻⁶℃⁻¹)
4	1099.52(44.08)	2.36(0.14)	57.28(2.18)	1.9	9.0
Notes: Data in brackets are standard deviations.

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表 4 海砂工程水泥基复合材料(ECC)配合比

Table 4. Mixture proportion of sea sand engineering cementitious composite (ECC) kg/m³

Cement	Fly ash	Metakaolin	Silica sand	Sea sand	Water	Fiber
278	890	56	178	267	330	26

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表 5 BFRP筋增强海砂ECC复合板试件明细

Table 5. Specimen detail of BFRP reinforced sea sand ECC

Specimen ID	Erosion system	Number of BFRP bars
4BFRP/ECC(GL, GW)	Wetting-drying cycling in NaCl solution	4
3BFRP/ECC(GL, GW)		3
2BFRP/ECC(GL, GW)		2
4BFRP/ECC(JL, JW)	Soaking in NaCl solution	4
3BFRP/ECC(JL, JW)		3
2BFRP/ECC(JL, JW)		2
Notes: In specimen ID, "G"—Wetting-drying cycling in NaCl solution; "J"—Soaking in NaCl solution; "L"—Uniaxial tensile test; "W"—Four-point bending test.

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表 6 不同侵蚀制度及配筋率下BFRP筋增强海砂ECC复合板的单轴拉伸试验结果

Table 6. Uniaxial tensile test results of BFRP reinforced sea sand ECC under different erosion systems and reinforcement ratios

Specimen ID	First-crack strength/ MPa	Ultimate tensile strength/ MPa	Ultimate tensile strain/ %
2BFRP/ECC(GL)	5.04	11.33	4.92
3BFRP/ECC(GL)	9.40	15.71	6.15
4BFRP/ECC(GL)	9.11	19.35	6.99
2BFRP/ECC(JL)	5.08	13.96	5.65
3BFRP/ECC(JL)	9.38	14.44	6.27
4BFRP/ECC(JL)	9.02	16.24	8.07

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表 7 不同侵蚀制度下BFRP筋增强海砂ECC复合板的四点弯曲试验结果

Table 7. Four-point bending test results of BFRP reinforced sea sand ECC under different erosion systems

Specimen ID	First-crack load/N	First-crack deflection/mm	Ultimate load/N	Ultimate deflection/mm
2BFRP/ECC(GW)	592	0.55	2212	15.47
3BFRP/ECC(GW)	557	0.45	2478	15.00
4BFRP/ECC(GW)	590	0.88	3023	15.60
2BFRP/ECC(JW)	850	0.67	3166	11.03
3BFRP/ECC(JW)	517	0.60	2256	12.97
4BFRP/ECC(JW)	297	0.30	2183	18.70

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表 8 BFRP筋增强海砂ECC弯曲韧性指标

Table 8. Flexural toughness indexes of BFRP bars reinforced sea sand ECC

Specimen ID	I₅	I₁₀	I₂₀	I₃₀	I_u
2BFRP/ECC(GW)	6	12	33	60	162
3BFRP/ECC(GW)	9	23	66	128	613
4BFRP/ECC(GW)	6	16	47	89	108
2BFRP/ECC(JW)	6	14	38	69	95
3BFRP/ECC(JW)	6	14	37	68	131
4BFRP/ECC(JW)	6	13	37	73	840
Note: I₅, I₁₀, I₂₀, I₃₀ and I_u—Flexural toughness indexes of BFRP bars reinforced sea sand ECC.

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