硫酸盐侵蚀对掺钢渣粉PVA纤维增强水泥基复合材料断裂性能影响

苏骏; 范子康; 蔡新华

硫酸盐侵蚀对掺钢渣粉PVA纤维增强水泥基复合材料断裂性能影响

1.
湖北工业大学　土木建筑与环境学院, 武汉 430068
2.
武汉大学　水资源与水电工程科学国家重点实验室, 武汉 430072

基金项目: 国家自然科学基金面上项目(52178247)；湖南省水利科技项目(XSKJ2021000-15)

详细信息

通讯作者:
苏骏，博士，教授，硕士生导师，研究方向为新型混凝土材料与结构 Email：SuJun930@163.com

中图分类号: TU528
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出版历程
- 收稿日期: 2023-08-08
- 修回日期: 2023-10-25
- 录用日期: 2023-11-09
- 网络出版日期: 2023-11-22
- 刊出日期: 2024-06-15

Effect of sulfate corrosion on the fracture properties of PVA fiber reinforced cement-based composite materials with steel slag powder

SU Jun^{1
, ,},
FAN Zikang¹,
CAI Xinhua²

1.
School of Civil Engineering and Environment, Hubei University of Technology, Wuhan 430068, China
2.
State Key Laboratory of Water Resources & Hydropower Engineering Science, Wuhan University, Wuhan 430072, China

Funds: National Natural Science Foundation of China (52178247); Hydraulic Science and Technology Project of Hunan Providence (XSKJ2021000-15)

摘要

摘要: 为研究固体废料钢渣以及硫酸盐溶液侵蚀作用下水泥基复合材料断裂特性，本文设计掺入不同质量分数的钢渣粉制备PVA纤维增强水泥基复合材料，通过对硫酸盐侵蚀后的预制初始裂缝梁式试件进行三点弯曲性能试验，同时结合掺钢渣粉PVA/ECC在Na₂SO₄溶液(质量分数为5%)中的表观形态和微观结构特征，探究硫酸盐侵蚀对钢渣粉PVA/ECC断裂性能的影响。结果表明：在未受硫酸盐侵蚀钢渣粉掺量为20%时，试件起裂荷载、失稳荷载提升效果最佳，较未掺钢渣粉试件分别提高约61%、110%；PVA/ECC断裂韧度随侵蚀时间先增大后减小，侵蚀60d到达峰值，120d后S80组劣化最明显，起裂韧度$ {K}^{\mathrm{u}\mathrm{n}} $和失稳韧度$ {K}^{\mathrm{u}\mathrm{n}} $分别减小了约23%、13%；适量钢渣粉的掺入能有效缓解PVA纤维增强水泥基复合材料的侵蚀损伤，钢渣粉掺量不超过60%时在试验研究的龄期范围内材料未出现明显劣化。在此基础上通过Weibull分布模型预测试件耐久性寿命，其中钢渣粉掺量为20%的PVA/ECC使用寿命最长，可达到444次左右。
- PVA纤维 /
- 钢渣粉 /
- 硫酸盐侵蚀 /
- 干湿循环 /
- 断裂韧度 /
- 耐久性能
Abstract: In order to study the fracture characteristics of cement-based composite materials under the solid waste steel slag and erosion of sulfate solution, the PVA fiber reinforced cement-based composite materials were prepared by adding different mass fractions of steel slag powder. Three-point bending performance test was conducted on prefabricated initial crack beam specimens after sulfate erosion. Combined with the apparent morphology and microstructure characteristics of steel slag powder PVA/ECC in Na₂SO₄ solution (mass fraction of 5%), the effect of sulfate corrosion on the fracture performance of steel slag powder PVA/ECC was investigated. The results show that when the content of steel slag powder without sulfate attack is 20%, the cracking load and instability load of the specimen are the best, with an increase of about 61% and 110% compared to the specimens without steel slag powder, respectively; The fracture toughness of PVA/ECC first increases and then decreases with erosion time, reaching its peak after 60 days of erosion. After 120 days, the S80 group shows the most obvious degradation, with the initiation toughness $ {K}^{\mathrm{u}\mathrm{n}} $and instability toughness $ {K}^{\mathrm{u}\mathrm{n}} $decreasing by about 23% and 13%, respectively; The addition of an appropriate amount of steel slag powder can effectively alleviate the erosion damage of PVA fiber reinforced cement-based composite materials. When the amount of steel slag powder does not exceed 60%, there is no significant deterioration of the material within the age range of the experimental study. On this basis, the durability life of the specimens was predicted using a Weibull distribution model, PVA/ECC with a 20% steel slag powder content having the longest service life, reaching around 444 cycles.
- PVA fiber /
- steel slag powder /
- sulfate erosion /
- dry and wet cycle /
- fracture toughness /
- durability performance

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图 1 钢渣粉XRD图谱

Figure 1. XRD spectrum of steel slag powder

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图 2 带预制切口梁示意图

Figure 2. Schematic diagram of beams with prefabricated cuts

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图 3 加载设备及引伸计

Figure 3. Loading equipment and extensometer

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图 4 不同侵蚀龄期下PVA/ECC预制切口梁荷载-挠度曲线

Figure 4. Load deflection curve of PVA/ECC prefabricated cut beams under different erosion ages

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图 5 典型PVA/ECC试件破坏形态

Figure 5. Typical PVA/ECC specimen failure mode

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图 6 不同影响因素下PVA/ECC起裂荷载与失稳荷载

Figure 6. PVA/ECC cracking load and instability load under different influencing factors

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图 7 硫酸盐侵蚀破坏示意图

Figure 7. Schematic diagram of sulfate erosion damage

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图 8 PVA/ECC断裂参数变化规律

Figure 8. Changes in fracture parameters of PVA/ECC

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图 9 不同侵蚀龄期下掺钢渣粉PVA/ECC微观结构

Figure 9. Microstructure of PVA/ECC with steel slag powder at different erosion ages

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图 10 不同PVA/ECC试件耐久性寿命预测曲线

Figure 10. Durability life prediction curve of different PVA/ECC specimens

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表 1 水泥化学组成(wt%)

Table 1. Chemical composition of cement (wt%)

SiO₂	CaO	Fe₂O₃	Al₂O₃	K₂O	Na₂O	MgO	P₂O₅	TiO₂	SO₃
17.63	65.39	4.11	5.35	0.70	0.20	1.43	0.16	0.33	3.51

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表 2 钢渣粉的基本性能

Table 2. Basic properties of steel slag powder

Name	Density/(g·cm⁻³)	Specific surface area (m²·kg⁻¹)	Activity index
Name	Density/(g·cm⁻³)	Specific surface area (m²·kg⁻¹)	7 d	28 d
Steel slag powder	5.3	400	71.63%	84.27%
Specification	≥3.2	-	≥65	≥80

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表 3 钢渣粉XRF检测结果(%)

Table 3. XRF testing results of steel slag powder (%)

CaO	SiO₂	Fe₂O₃	Al₂O₃	MgO	Na₂O	SO₃	P₂O₅
43.55	14.22	24.26	2.86	4.34	2.98	1.39	1.24

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表 4 钢渣粉的粒度分布结果

Table 4. Particle size distribution results of steel slag powder

Particle size/μm	0-2	2-5	5-10	10-20	20-30	30-40	40-45	＞45
Content/wt%	13.2	14.1	14.3	33.3	9.1	5.6	1.4	9.1

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表 5 PVA纤维物理性能指标

Table 5. Physical Performance Indicators of PVA Fibers

Length/mm	Diameter /mm	Aspect ratio	Tensile strength/MPa	Elongation rate/%	Tensile modulus of elasticity/GPa	Density /(g·cm⁻³)
12	40	300	1600	7	42	1.3

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表 6 掺钢渣粉PVA/ECC材料配合比

Table 6. Mix proportion of PVA/ECC material mixed with steel slag powder

Group	Cement	Silica fume	Steel slag powder	Water	Sand	Water reducing agent	PVA dosage
S0	0.98	0.02	0	0.25	0.2	1%	2%
S20	0.78	0.02	0.2	0.25	0.2	1%	2%
S40	0.58	0.02	0.4	0.25	0.2	1%	2%
S60	0.38	0.02	0.6	0.25	0.2	1%	2%
S80	0.18	0.02	0.8	0.25	0.2	1%	2%
Notes: S0 indicates that the amount of steel slag powder added is 0; In the table, except for the volume ratio of PVA content, all others are mass ratios.

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表 7 掺钢渣粉PVA/ECC材料试件编号

Table 7. Number of PVA/ECC material specimens mixed with steel slag powder

Group	Steel slag powder dosage(wt%)	Number of wet and dry cycles
L0		0
L2		2
L4		4
L6		6
L8		8
S0	0
S20	20
S40	40
S60	60
S80	80

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表 8 Weibull分布两参数

Table 8. Two parameters of Weibull distribution

Number	Shape parameter$ m $	Scaling parameter$ \theta $
S0	3.614	127.966
S20	2.198	161.564
S40	2.525	131.077
S60	4.112	125.191
S80	3.91	108.872

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