CF/SSF增强珊瑚砂水泥砂浆微观结构分析及动态劈裂拉伸试验研究

郭瑞奇; 李江南; 马林建; 欧灿; 许鑫

doi:10.11883/bzycj-2-23-0466

CF/SSF增强珊瑚砂水泥砂浆微观结构分析及动态劈裂拉伸试验研究

doi: 10.11883/bzycj-2-23-0466

郭瑞奇^1,,
李江南¹,
马林建^2, ,,
欧灿¹,
许鑫¹

1.
湘潭大学土木工程学院，湖南湘潭 411105
2.
陆军工程大学爆炸冲击防灾减灾全国重点实验室，江苏南京 210007

基金项目: 湖南省自然科学基金（2023JJ40610, 2023JJ30569）；湖南省教育厅优秀青年项目（23B0124）；湖南省研究生科研创新项目（QL20230162）

详细信息

作者简介:
郭瑞奇（1993－　），男，博士，讲师，grq@xtu.edu.cn

通讯作者:
马林建（1984－　），男，博士，教授，patton.4400@163.com

中图分类号: O347.3; TU377
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- 文章访问数: 157
- HTML全文浏览量: 43
- PDF下载量: 54
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-27
- 修回日期: 2024-03-30
- 网络出版日期: 2024-04-01
- 刊出日期: 2024-11-15

Microstructure and dynamic splitting tensile properties of CF/SSF reinforced coral sand cement mortar

GUO Ruiqi^1
,,
LI Jiangnan¹,
MA Linjian^{2
, ,},
OU Can¹,
XU Xin¹

1.
College of Civil Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
2.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

摘要

摘要: 珊瑚混凝土是一种拉压强度严重不对称的材料，研究其动态拉伸力学性能对岛礁防护工程具有重要意义。为了探究碳纤维（carbon fiber, CF）和不锈钢纤维（stainless steel fiber, SSF）增强珊瑚砂水泥砂浆在冲击荷载作用下的动态拉伸力学性能，采用$\varnothing $100 mm的分离式霍普金森压杆（split Hopkinson pressure bar, SHPB）装置进行动态劈裂试验，对比分析不同纤维掺量的珊瑚砂水泥砂浆在不同应变率下的动态抗拉强度和能量耗散规律，并结合扫描电子显微镜揭示混杂纤维的作用机理。结果表明：复掺CF和SSF的珊瑚砂水泥砂浆试样的静、动态抗拉强度均有显著提高，最大动态抗拉强度增长率为66.03%。在相同应变率下，试样的动态抗拉强度与纤维掺量呈正相关，其破碎程度与纤维掺量呈负相关，纤维的桥接作用对试样裂缝开展具有良好的抑制效果。在同一纤维掺量下，动态增长因子随应变率的升高明显增大，动态增长因子最大值为2.44，表现出明显的拉伸应变率效应。珊瑚砂水泥砂浆试样的破碎程度及耗散能量均与应变率呈正相关，且纤维掺量越高，试样破坏时需要耗散的能量越多。
- 珊瑚砂水泥砂浆 /
- 混杂纤维 /
- 动态劈裂拉伸 /
- 应变率效应 /
- 能量耗散
Abstract: Coral concrete is a material with severely asymmetric tensile and compressive strengths. Therefore, studying the dynamic tensile mechanical properties of coral concrete is of great significance for island reef protective engineering. To investigate the dynamic tensile mechanical properties of carbon fiber (CF) and stainless steel fiber (SSF) reinforced coral sand cement mortar under impact loading, dynamic splitting tests were conducted using a 100 mm diameter split Hopkinson pressure bar (SHPB) device. Comparative analysis was carried out on the dynamic tensile strength and energy dissipation patterns of coral sand cement mortars with different fiber contents at various strain rates. In the SHPB tests, cement mortar specimens with different fiber contents were prepared: no fiber, 1.5% CF, 1.5% CF with 0.5% SSF, 1.5% CF with 1.0% SSF, and 1.5% CF with 1.5% SSF. The specimens were subjected to four impact velocities: 3.45, 4.86, 6.54, and 7.34 m/s. This allowed for impact-splitting tests conducted at different strain-rate ranges. In addition, scanning electron microscope (SEM) tests were performed to reveal the action mechanism of the hybrid fibers. The results indicate that the static and dynamic tensile strengths of CF and SSF-reinforced coral sand cement mortar specimens are significantly improved, with a maximum dynamic tensile strength increase ratio of 66.03%. At the same strain rate, the dynamic tensile strength of the specimens positively correlates with the fiber content, while the fragmentation degree negatively correlates with the fiber content. The fiber bridging effect effectively suppresses the development of cracks in the specimens. Under the same fiber content, the dynamic increase factor increases significantly with the increase of strain rate, with a maximum increase factor of 2.44, demonstrating a clear tensile strain rate effect. The fragmentation degree and dissipated energy of coral sand cement mortar specimens positively correlate with the strain rate, and samples with higher fiber dosages require more energy to dissipate during failure.
- coral sand cement mortar /
- hybrid fiber /
- dynamic splitting tension /
- strain rate effect /
- energy dissipation

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图 1 SHPB试验设备示意图

Figure 1. Schematic diagram of SHPB test device

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图 2 静态劈裂破坏形态

Figure 2. Static splitting failure morphologies

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图 3 水化产物微观形貌

Figure 3. Microscopic morphology of hydration products

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图 4 不同放大倍率下纤维的断面SEM图像

Figure 4. SEM images of fiber cross-sections at different magnifications

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图 5 水泥砂浆动态劈裂试样动态平衡曲线

Figure 5. Dynamic equilibrium curves of cement mortar dynamic splitting specimen

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图 6 不同应变率下水泥砂浆试样破坏形态

Figure 6. Failure morphology of cement mortar specimens under different strain rates

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图 7 应变率与峰值应力和动态增长因子的关系

Figure 7. Relationships between peak stress, dynamic increase factor, and strain rate

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图 8 不同应变率下劈裂拉伸的能量时程曲线

Figure 8. Time history curves of splitting tensile energies under different strain rates

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图 9 入射能量、反射能量、吸收能量与应变率的关系

Figure 9. Relationships of incident, reflected, and absorbed energies with strain rate

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表 1 水泥、粉煤灰和硅灰的化学成分

Table 1. Chemical compositions of cement, fly ash, and silica fume

组分	质量分数/%
组分	CaO	Al₂O₃	SiO₂	Fe₂O₃	MgO	SO₃
水泥	51.42	8.26	24.99	4.03	3.71	2.51
粉煤灰	5.60	30.14	50.26	4.16	0	2.16
硅灰	0.11	0.32	96.74	0.08	0.10	0

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表 2 碳纤维和316L不锈钢纤维的基本性能参数

Table 2. Basic performance parameters of carbon and 316L stainless steel fibers

材料	长度/ mm	直径/ μm	抗拉强度/ MPa	密度/ (g·cm⁻³)	伸长率/%
CF	10	7~10	3 700	1.76	1.5
SSF	12	200	1 950	7.98	5.0

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表 3 碳纤维/不锈钢纤维珊瑚砂水泥砂浆配合比

Table 3. Mix ratios of carbon fiber/stainless steel fiber reinforced coral sand cement mortar

工况	配合比/(kg·m⁻³)
工况	水泥	粉煤灰	硅灰	珊瑚砂	人工海水	减水剂	CF	SSF
1	711	253	95	1 373	274	9	0	0
2	711	253	95	1 373	274	9	26.4	0
3	711	253	95	1 373	274	9	26.4	39.9
4	711	253	95	1 373	274	9	26.4	79.8
5	711	253	95	1 373	274	9	26.4	119.7

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表 4 同一龄期下不同纤维掺量试样静态抗拉强度

Table 4. Static tensile strengths of specimens with different fiber contents at the same age

试件编号	静态劈裂拉伸强度/MPa			平均强度/MPa	强度增长率/%
试件编号	第1次试验	第2次试验	第3次试验	平均强度/MPa	强度增长率/%
CF/SSF-0/0	5.0	5.6	5.6	5.4
CF/SSF-1.5/0	6.1	5.9	6.4	6.1	12.96
CF/SSF-1.5/0.5	8.2	7.5	7.5	7.7	42.59
CF/SSF-1.5/1.0	7.6	8.3	8.4	8.1	50.00
CF/SSF-1.5/1.5	9.3	8.8	8.7	8.9	64.81
注：试件编号CF/SSF-0/0表示CF的体积分数为0%，SSF体积分数为0%。

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