高强高韧机敏混凝土的制备及其性能

刘金涛; 洪宇超; 周煜; 王伟胜; 孔德玉

高强高韧机敏混凝土的制备及其性能

刘金涛^{1, 2},
洪宇超¹,
周煜¹,
王伟胜¹,
孔德玉^{1, 2, ,}

1.
浙江工业大学　土木工程学院, 杭州 310023
2.
浙江省工程结构与防灾减灾技术研究重点实验室, 杭州 310023

基金项目: 国家自然科学基金项目 (52379136)；水利部水工程材料重点实验室(筹)开放研究基金项目 (EMF202414)

详细信息

通讯作者:
孔德玉，工学博士，教授，博士生导师，研究方向为高性能水泥基材料　E-mail: kongdeyu@zjut.edu.cn

中图分类号: TB322
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- 被引次数: 0
出版历程
- 收稿日期: 2024-01-19
- 修回日期: 2024-03-04
- 录用日期: 2024-03-10
- 网络出版日期: 2024-04-12

Preparation and performance of smart high strength and high ductile concrete

LIU Jintao^{1, 2},
HONG Yuchao¹,
ZHOU Yu¹,
WANG Weisheng¹,
KONG Deyu^{1, 2
, ,}

1.
College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2.
Zhejiang Key Laboratory of Engineering Structure and Disaster Prevention and Mitigation Technology, Hangzhou 310023, China

Funds: National Natural Science Foundation of China (52379136); Open Research Fund of Key Laboratory of Engineering Materials of Ministry of Water Resources (EMF202414)

摘要

摘要: 研究通过混杂碳纤维(Carbon Fiber，CF)和聚乙烯纤维(Polyethylene Fiber，PE)制备出高强高韧性混凝土(High strength and high ductility concrete，HSHDC)，并对其力学性能及机敏性特性进行了分析。研究表明0.25vol%CF掺量HSHDC的抗压强度较对照组提升7%、抗折强度增加13%、拉伸应变提高15.2%。HSHDC的电阻率值随CF掺量增加而显著降低，1.0vol%CF掺量HSHDC的电阻率值下降至10 Ω·m，较对照组降低三个数量级。在不同温度与相对含水率下，掺有CF的HSHDC电阻率表现出较好的稳定性，循环荷载作用下0.25vol%CF掺量HSHDC电阻率变化率与应力之间表现出良好的对应关系，压应力和压应变灵敏系数分别达到0.75%/MPa和136.5。0.25vol%CF掺量的HSHDC在加载幅度为15 MPa时的最大电阻率变化率为9.2%，加载速度为0.4 mm/min时峰值电阻率变化率达到7.9%。
- 混杂纤维 /
- 高韧性混凝土 /
- 力学性能 /
- 温敏性能 /
- 湿敏性能 /
- 压敏性能
Abstract: In this study, high strength and high ductility concrete (HSHDC) was developed by mixing carbon fiber (CF) and polyethylene fiber (PE). The mechanical properties and agility of HSHDC were analyzed. The results show that the compressive strength, flexural strength and tensile strain of HSHDC with 0.25vol% CF content were 7% higher than those of control group. The resistivity of HSHDC decreases significantly with the increase of CF content, and the resistivity of HSHDC with 1.0vol%CF content was as low as 10 Ω·m, which was three orders of magnitude lower than that of the control group. With different temperature and relatively humidity conditions, the resistivity of HSHDC mixed with CF showed good stability. Under cyclic loading, the resistivity change rate of HSHDC with 0.25vol%CF content showed a good correspondence with the stress, and the compressive stress and compressive strain sensitivity coefficients reached 0.75%/MPa and 136.5, respectively. For HSHDC with 0.25vol%CF content, the maximum resistivity change rate was 9.2% when the loading amplitude was 15MPa, and the peak resistivity change rate was 7.87% when the loading speed was 0.4 mm/min.
- hybrid fiber /
- high ductile concrete /
- mechanical properties /
- temperature sensitive property /
- humidity sensitive property /
- pressure sensitive property

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图 1 拉伸试件尺寸(a)及拉伸试验测试图(b)

Figure 1. Dimensions of tensile specimens (a) and tensile test (b)

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图 2 四电极测试法示意图(a)、压敏性测试试验图(b)

Figure 2. Four-electrode test method diagram (a) and pressure sensitivity test diagram (b)

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图 3 HSHDC的抗压、抗折强度

Figure 3. Compressive and flexural strength of HSHDC

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图 4 C4组试件断面纤维分布图

Figure 4. Fiber distribution of specimens in Group C4

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图 5 HSHDC的拉伸强度及极限拉伸应力与应变

Figure 5. Tensile strength and ultimate tensile stress and strain of HSHDC

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图 6 不同温度下HSHDC的电阻率值

Figure 6. The resistivity of HSHDC at different temperatures

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图 7 不同相对含水率下HSHDC的电阻率

Figure 7. The resistivity of HSHDC under different humidity

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图 8 在循环压缩荷载作用下的HSHDC试件电阻率变化率与应力应变关系

Figure 8. Relationship between the rate of resistivity change and the stress strain of the HSHDC specimen under cyclic compression loading

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图 9 不同加载幅度下C1组电阻率变化率与应力-应变关系

Figure 9. Relationship between the resistivity change rate and stress-strain of group C1 under different loading amplitudes

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图 10 不同加载幅度下C2组电阻率变化率与应力-应变关系

Figure 10. Relation between the resistivity change rate and stress-strain of group C2 under different loading amplitudes

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图 11 加载幅度对HSHDC应力(a)、应变(b)灵敏系数的影响

Figure 11. Influence of loading amplitude on the sensitivity coefficients of stress (a) and strain (b) in HSHDC

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图 12 不同加载频率下C1组HSHDC的电阻率变化率与应力-应变关系

Figure 12. Relation between the resistivity change rate and stress-strain of C1 HSHDC under different loading frequencies

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图 13 不同加载频率下C2组电阻率变化率与应力应变关系

Figure 13. Relation between the rate of change of resistivity and stress-strain in group C2 under different loading frequencies

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图 14 加载速率对HSHDC应力(a)、应变(b)灵敏系数的影响

Figure 14. Influence of loading rate on the sensitivity coefficients of stress (a) and strain (b) in HSHD

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表 1 PⅡ 52.5水泥的基本性能

Table 1. PⅡ 52.5 Basic properties of cement

Firing loss/%	Sulfur trioxide/%	Chloride Ion/%	Specific surface area/(m²·kg⁻¹)	Initial setting time/min	Final setting time/min	Compressive Strength/MPa		Flexural Strength/MPa
Firing loss/%	Sulfur trioxide/%	Chloride Ion/%	Specific surface area/(m²·kg⁻¹)	Initial setting time/min	Final setting time/min	3 d	28 d	3 d	28 d
2.73	2.18	0.031	344	128	175	6.5	34.7	9.1	59.1

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表 2 纤维的基本性能

Table 2. Basic properties of fibers

Fiber type	Density/ (g·cm⁻³)	Length/ mm	Fiber diameter/μm	Tensile strength/MPa	Tensile modulus of elasticity/GPa	Resistivity/ (Ω·cm)
PE	0.97	12	24	3000	116	10³-10⁵
CF	1.75	12	7	3530	228	1.0-1.6
Notes: PE—Polyethylene fiber; CF—Carbon fiber.

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表 3 高强高韧性混凝土(HSHDC)配合比设计及其流动性

Table 3. Mix ratio design and fluidity of high strength and high ductility concrete (HSHDC)

Group	Cement/g	Fly ash/g	Silica fume/g	Sand/g	Water reducing Agent/g	Water/g	PE/vol%	CF/vol%	Fluidity/mm
R	700	500	200	400	6.0	364	2.00	0	181
C1	700	500	200	400	6.0	364	1.75	0.25	173
C2	700	500	200	400	6.0	364	1.50	0.50	169
C3	700	500	200	400	6.0	364	1.25	0.75	168
C4	700	500	200	400	6.0	364	1.00	1.00	165

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