无机矿物氟碳复合涂料对混凝土抗盐冻性能的影响

肖阳; 张亮; 张宿峰; 张平; 张盼盼; 刘亚州

doi:10.13801/j.cnki.fhclxb.20220809.005

无机矿物氟碳复合涂料对混凝土抗盐冻性能的影响

doi: 10.13801/j.cnki.fhclxb.20220809.005

肖阳¹,
张亮²,
张宿峰¹,
张平²,
张盼盼³,
刘亚州^4, ,

1.
黑龙江省公路建设中心，哈尔滨 150001
2.
吉黑高速山河(吉黑省界)至哈尔滨(永源镇)段工程建设项目办，哈尔滨 150001
3.
交通运输部公路科学研究所，北京 100088
4.
石家庄铁道大学　材料科学与工程学院，石家庄 050043

详细信息

通讯作者:
刘亚州，博士，讲师，研究方向为新型材料与结构　 Email: 1217387758@qq.com

中图分类号: TU528.32；TB332
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出版历程
- 收稿日期: 2022-05-24
- 修回日期: 2022-07-15
- 录用日期: 2022-07-25
- 网络出版日期: 2022-08-09
- 刊出日期: 2023-05-15

Influence of inorganic mineral fluorocarbon composite coating on salt freezing resistance of concrete

1.
Heilongjiang Province Highway Construction Center, Harbin 150001, China
2.
Engineering Construction Project Office of Highway Section between Shanhe (Provincial Boundary between Jilin and Heilongjiang) and Harbin (Yongyuan Town) of Jihei Highway, Harbin 150001, China
3.
Research Institute of Highway Ministry of Transport, Beijing 100088, China
4.
School of Materials and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

摘要

摘要: 通过表面疏水性能试验、力学性能试验、界面粘结性能试验和混凝土盐冻试验，研究了无机矿物对水性氟碳涂料性能的影响，研究了盐冻环境下无机矿物氟碳复合涂料附着力变化，分析了其对混凝土单位面积剥落量的影响，结合微观形貌变化和孔结构变化，分析了混凝土抗盐冻性能提升机制。结果表明：单掺硅溶胶时，氟碳复合涂料水接触角较氟碳涂料增大了10.2%，其铅笔硬度高达3 H；三掺硅溶胶、海泡石粉和铁尾矿粉时，氟碳复合涂料铅笔硬度高达3 H，其附着力增大了44.2%；复掺硅溶胶和海泡石粉时，氟碳复合涂料性能介于两者之间。盐冻环境下单掺硅溶胶氟碳复合涂料残余附着力最大。无机矿物氟碳复合涂料能显著改善混凝土抗剥蚀性能，但改善效果较氟碳涂料不显著。盐冻环境下水性氟碳涂料产生部分微孔，孔结构粗化，而单掺硅溶胶氟碳复合涂料微观结构仍较致密，其最可几孔径略有增大，涂料仅略有损伤。单掺硅溶胶氟碳复合涂料防护下混凝土微观结构更致密，其单位面积剥落量较未防护时降低幅度高达81.2%。为寒冷地区盐冻环境下混凝土防护涂料的设计提供了试验和理论依据。
- 盐冻 /
- 氟碳涂料 /
- 无机矿物 /
- 混凝土 /
- 剥落量 /
- 机制
Abstract: The influences of inorganic mineral on the properties of waterborne fluorocarbon coating were studied, and the variation in adhesion of fluorocarbon composite coatings under the salt freezing environment was studied, and the influence of fluorocarbon composite coatings on the amount of spalling per unit area of concrete was analyzed, by surface hydrophobic property test, mechanical property test, interface bonding property test and salt freezing test of concrete. The improvement mechanism of salt freezing resistance of concrete was analyzed, combining the changes of microscopic appearance and pore structure. The results show that the water contact angle of the fluorocarbon composite coating with single doped silica sol increases by 10.2%, compared with fluorocarbon coating, and the pencil hardness is up to 3 H. The pencil hardness of the fluorocarbon composite coating with triple adding of silica sol, sepiolite powder and iron tailing powder is up to 3 H, and the adhesion increases by 44.2%. The properties of the fluorocarbon composite coating with double adding of silica sol and sepiolite powder lie between both coatings. The residual adhesion of the fluorocarbon composite coating with single doped silica sol is the largest. Inorganic mineral fluorocarbon composite coatings can significantly improve the exfoliation resistance of concrete, but the improvement effect is not significant compared with fluorocarbon coating. Some micropores are generated in the waterborne fluorocarbon coating under the salt freezing environment, and the pore structure is coarsened. However, the microstructure of the fluorocarbon composite coating with single doped silica sol is still denser, and the most probable pore diameter increases slightly, and the coating is only slightly damaged. The microstructure of concrete under the protection of the fluorocarbon composite coating with single doped silica sol is denser, and the spalling amount per unit area decreases by 81.2%, compared with that without protection. Research results provide experimental and theoretical bases for the design of concrete protective coating under the salt freezing environment in cold areas.
- salt freezing /
- fluorocarbon coating /
- inorganic mineral /
- concrete /
- amount of spalling /
- mechanism

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图 1 硅溶胶掺量对涂料性能的影响

Figure 1. Influence of silica sol content on coating properties

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图 2 不同硅溶胶掺量的涂料水接触角照片

Figure 2. Photos of water contact angle of coatings with different silica sol contents

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图 3 不同硅溶胶掺量的涂料/水泥加压板拉拔破坏情况

Figure 3. Drawing damage situations between cement pressurization plate and coating with different silica sol contents

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图 4 无机矿物掺加方式对涂料性能的影响

Figure 4. Influence of inorganic mineral adding way on coating properties

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图 5 不同无机矿物掺加方式的氟碳复合涂料水接触角照片

Figure 5. Photos of water contact angle of fluorocarbon composite coatings with different inorganic mineral adding ways

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图 6 不同无机矿物掺加方式的氟碳复合涂料/水泥加压板拉拔破坏情况

Figure 6. Drawing damage situations between cement pressurization plate and fluorocarbon composite coatings with different inorganic mineral adding ways

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图 7 盐冻前后不同无机矿物掺加方式的氟碳复合涂料附着力

Figure 7. Adhesion of fluorocarbon composite coatings with different inorganic mineral adding ways before and after salt freezing

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图 8 盐冻后不同混凝土/涂料体系拉拔破坏情况

Figure 8. Drawing damage situations between concrete and different coatings after salt freezing

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图 9 盐冻过程中不同无机矿物掺加方式的氟碳复合涂料防护下混凝土单位面积剥落量

Figure 9. Spalling amount per unit area of concrete protected by fluorocarbon composite coatings with different inorganic mineral adding ways during the salt freezing process

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图 10 冻融循环28次后混凝土表面形貌

Figure 10. Surface morphologies of concrete after 28 freeze-thaw cycles

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图 11 盐冻前后不同涂料水接触角对比

Figure 11. Comparison result between water contact angles of different coatings before and after salt freezing

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图 12 盐冻前后不同涂料微观形貌对比

Figure 12. Comparison result between microscopic appearances of different coatings before and after salt freezing

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图 13 盐冻前后不同涂料孔结构对比结果

Figure 13. Comparison result between pore structures of different coatings before and after salt freezing

V—Cumulative pore volume; D—Diameter of hole

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图 14 盐冻后混凝土表面微观形貌对比结果

Figure 14. Comparison result between microscopic appearances of concrete surface after salt freezing

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表 1 铁尾矿粉的化学组成

Table 1. Chemical composition of iron tailing powder wt%

SiO₂	Al₂O₃	CaO	MgO	Fe₂O₃	Na₂O	K₂O	TiO₂
51.70	18.00	9.36	5.86	5.29	3.69	2.67	1.39

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表 2 无机矿物氟碳复合涂料配方

Table 2. Inorganic mineral fluorocarbon composite coating formulas

Serial number	Fluorocarbon coating	Silica sol	Nano-SiO₂ content/wt%
F00	1	0	0
F02	1	0.02	1
F04	1	0.04	2
F06	1	0.06	3
F08	1	0.08	4
F10	1	0.10	5
F15	1	0.15	7.4
F20	1	0.20	9.8
F25	1	0.25	12.3
F30	1	0.30	14.7
F35	1	0.35	17.2
F40	1	0.40	19.6
Notes: The formula refers to the mass ratios of various materials; Nano-SiO₂ content refers to the mass fraction of nano-SiO₂ accounting for fluorocarbon resin in the coating.

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表 3 水泥和煤粉灰的化学组成

Table 3. Chemical composition of cement and fly ash wt%

Category	CaO	SiO₂	Al₂O₃	MgO	Fe₂O₃	K₂O	Na₂O	SO₃
Cement	59.80	21.35	6.80	2.93	2.55	1.02	0.18	3.66
Fly ash	4.94	48.28	35.60	1.03	3.66	0.88	0.21	0.86

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表 4 混凝土配合比

Table 4. Concrete mix ratio kg·m⁻³

Cement	Fly ash	Coarse aggregate	Fine aggregate	Water reducer	Water
290	80	1 081	752	8.1	170

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表 5 不同无机矿物掺加方式的氟碳复合涂料配方

Table 5. Formulas of fluorocarbon composite coatings with different inorganic mineral adding ways

Serial number	Fluorocarbon coating	Silica sol	Sepiolite powder	Iron tailing powder
F	1	—	—	—
FS	1	0.250	—	—
FSS	1	0.125	0.1250	—
FSSI	1	0.125	0.0625	0.0625

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