硫酸盐侵蚀下混杂纤维/橡胶混凝土力学性能及微观结构

刘雨姗; 庞建勇

doi:10.13801/j.cnki.fhclxb.20230803.001

硫酸盐侵蚀下混杂纤维/橡胶混凝土力学性能及微观结构

doi: 10.13801/j.cnki.fhclxb.20230803.001

刘雨姗,
庞建勇^,

安徽理工大学　土木建筑学院，淮南 232001

基金项目: 安徽理工大学高层次引进人才科研启动基金(2022yjrc77)

详细信息

通讯作者:
庞建勇，博士，教授，博士生导师，研究方向为水泥混凝土材料　E-mail: pangjyong@163.com

中图分类号: TB332；TU278.3
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- 被引次数: 0
出版历程
- 收稿日期: 2023-06-14
- 修回日期: 2023-07-10
- 录用日期: 2023-07-18
- 网络出版日期: 2023-08-04
- 刊出日期: 2024-04-01

Mechanical properties and microstructure of hybrid fiber reinforced rubber concrete under sulfate attack

LIU Yushan,
PANG Jianyong^,

School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

Funds: Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology (2022yjrc77)

摘要

摘要: 为研究混杂纤维/橡胶混凝土(HF/RC)的抗硫酸盐侵蚀性能，对比分析硫酸盐环境下干湿循环240次内，普通混凝土(NC)和HF/RC的表观现象、质量损失、超声参数、抗压强度损失等性能指标劣化过程，采用SEM及XRD微观表征手段分析硫酸盐/干湿循环前后试件微观形貌及物相组成。结果表明：随硫酸盐/干湿循环次数增加，NC、HF/RC试件的质量、抗压强度呈先增后减的趋势，超声参数与抗压强度、耐蚀系数具有密切相关性；侵蚀初期SO₄ ²⁻与胶凝物质反应填充原生孔隙，基体密实度提高。侵蚀过程胶凝材料不断被消耗，基体在硫酸钠反复结晶的物理侵蚀及硫酸盐化学侵蚀的共同作用下出现空隙和孔洞。但橡胶颗粒和混杂纤维可阻断裂缝扩展继而减缓SO₄ ²⁻扩散，抑制膨胀性产物生成，延缓结晶应力诱发的表层裂纹发育。硫酸盐侵蚀各阶段HF/RC的劣化程度均优于NC，经240次硫酸盐/干湿循环后，NC、HF/RC的耐蚀系数分别为69.00%、78.87%。
- 硫酸盐环境 /
- 橡胶混凝土 /
- 玄武岩纤维 /
- 聚乙烯醇纤维 /
- 干湿循环 /
- 微观结构
Abstract: To study the sulfate resistance performance of hybrid fiber reinforced rubber concrete (HF/RC), the apparent phenomena, mass loss, ultrasonic parameters and compressive strength of normal concrete (NC) and HF/RC were analyzed during 240 dry-wet cycles under sulfate environment. SEM and XRD were used to analyze the microstructure and phase composition of the specimen under sulfate attack. The results show that with the increase of dry-wet cycles, the mass and compressive strength of NC and HF/RC specimens increase firstly and then decrease. Ultrasonic parameters are closely related to compressive strength and corrosion resistance coefficient. In the early stage of erosion, SO₄ ²⁻ reacts with the cementitious material to fill the original pores, and the compactness of the matrix is improved. With the continuous consumption of cementitious materials, voids and pores appear in the matrix due to the physical erosion caused by repeated crystallization of sodium sulfate and the chemical erosion caused by sulfate. Rubber particles and hybrid fibers delay the emergence and development of crack and slow down SO₄ ²⁻ diffusion. The generation of expansive products is inhibited, and the development of surface cracks induced by crystallization stress is delayed. The damage degree of HF/RC in each stages of sulfate erosion is better than that of NC. After 240 dry-wet cycles, the corrosion resistance coefficient of NC is 69.00% while that of HF/RC is 78.87%.
- sulfate environment /
- rubber concrete /
- basalt fiber /
- polyvinyl alcohol fiber /
- dry-wet cycle /
- microstructure

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图 1 橡胶颗粒表观形貌

Figure 1. Appearance of rubber particles

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图 2 纤维表观形貌

Figure 2. Appearance of fibers

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图 3 普通混凝土(NC)和混杂纤维/橡胶混凝土(HF/RC)不同硫酸盐侵蚀阶段质量变化

Figure 3. Mass fraction of normal concrete (NC) and hybrid fiber reinforced rubber concrete (HF/RC) exposed to different corrosion time

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图 4 NC和HF/RC不同硫酸盐侵蚀阶段表观形貌

Figure 4. Apparent phenomenon of NC and HF/RC exposed to different corrosion time

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图 5 NC和HF/RC不同硫酸盐侵蚀阶段抗压强度及耐蚀系数K_f

Figure 5. Compressive strength and corrosion resistance coefficient K_f of NC and HF/RC exposed to different corrosion time

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图 6 NC和HF/RC硫酸盐侵蚀时间与超声参数的拟合关系

Figure 6. Fitting relationship between ultrasound parameters and corrosion time of NC and HF/RC

V_R—Relative velocity; n—Corrosion time; R²—Coefficient of determination; D—Damage degree

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图 7 NC和HF/RC超声参数与耐蚀系数的拟合关系

Figure 7. Fitting relationship between ultrasound parameters and corrosion resistance coefficient of NC and HF/RC

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图 8 NC和HF/RC不同硫酸盐侵蚀阶段荷载-位移曲线

Figure 8. Load-displacement curves of NC and HF/RC exposed to different corrosion time

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图 9 NC和HF/RC不同硫酸盐侵蚀阶段受压破坏模式

Figure 9. Failure pattern diagram of NC and HF/RC exposed to different corrosion time

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图 10 HF/RC试件破裂面

Figure 10. Fracture surface of HF/RC

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图 11 NC不同硫酸盐侵蚀阶段微观形貌

Figure 11. Micro-structures of NC exposed to different corrosion time

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图 12 硫酸盐侵蚀混凝土XRD图谱

Figure 12. XRD patterns of concrete with sulfate attack

C-S-H—Hydrate calcium silicate

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图 13 硫酸盐侵蚀混凝土的微观形貌

Figure 13. Micro-structures of concrete exposed to sulfate attack

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图 14 硫酸盐侵蚀240天HF/RC试件的微观形貌

Figure 14. Micro-structures of HF/RC exposed to sulfate attack for 240 days

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表 1 纤维基本物理力学性能参数

Table 1. Basic physical and mechanical parameters of fibers

Property	Length/mm	Tensile strength/MPa	Elastic modulus/GPa	Elongation at break/%	Density/(g·cm⁻³)
Basalt fiber	18	3000-4800	90-110	1.5-3.2	2.63
Polyvinyl alcohol fiber	12	1600-2500	40-80	6.0	1.20

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表 2 混凝土配合比

Table 2. Mixing proportions of concrete

Group number	Rubber particle size/mm	Rubber particle/ (kg·m⁻³)	Basalt fiber/ (kg·m⁻³)	Polyvinyl alcohol fibers/(kg·m⁻³)	Sand/ (kg·m⁻³)	Limestone/ (kg·m⁻³)	Cement/ (kg·m⁻³)	Water reducer/ (kg·m⁻³)	Water/ (kg·m⁻³)
0^#	—	—	—	—	885	885	440	3.8	200
1^#	0-0.85	46.73	2.63	1.29	796.5	885	440	3.8	200
2^#	0-0.85	93.46	5.26	2.58	708	885	440	3.8	200
3^#	0-0.85	140.18	7.89	3.87	619.5	885	440	3.8	200
4^#	1-3	46.73	5.26	3.87	796.5	885	440	3.8	200
5^#	1-3	93.46	7.89	1.29	708	885	440	3.8	200
6^#	1-3	140.18	2.63	2.58	619.5	885	440	3.8	200
7^#	3-6	46.73	7.89	2.58	796.5	885	440	3.8	200
8^#	3-6	93.46	2.63	3.87	708	885	440	3.8	200
9^#	3-6	140.18	5.26	1.29	619.5	885	440	3.8	200

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表 3 正交试验结果

Table 3. Results of orthogonal experiments

Group number	Compressive strength/MPa	Splitting tensile strength/MPa	Flexural strength/MPa
0^#	38.56	3.73	5.60
1^#	32.81	3.89	5.65
2^#	32.02	4.05	5.71
3^#	24.76	3.82	5.66
4^#	36.39	4.51	6.28
5^#	30.01	4.17	5.51
6^#	27.19	3.52	5.28
7^#	31.83	4.39	6.03
8^#	30.22	3.88	5.15
9^#	24.58	3.34	5.24

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