纳米炭黑改性高强混凝土的力学和压敏性能

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 4012-4018.

纳米炭黑改性高强混凝土的力学和压敏性能

易碧良¹, 李庚英¹, 王林彬², 高寒³

1.华南农业大学水利与土木工程学院,广州 510642;
2.广州市市政工程试验检测有限公司,广州 510520;
3.重庆大学土木工程学院,重庆 400045

收稿日期:2024-04-19 修订日期:2024-06-17 出版日期:2024-11-15 发布日期:2024-11-21
通信作者: 李庚英,博士,教授。E-mail:ligengying@scau.edu.cn王林彬,博士。E-mail:1048600348@qq.com
作者简介:易碧良(2000—),男,硕士研究生。主要从事建筑材料的研究。E-mail:yibiliang@stu.scau.edu.cn
基金资助:
国家自然科学基金(52178209,51878299);广东省普通高校重点领域专项及创新团队项目(2023KCXTD005,2019KZDZX2001)

Mechanical Properties and Pressure Sensitivity of High Strength Cement Concrete Modified by Nano-Carbon Black

YI Biliang¹, LI Gengying¹, WANG Linbin², GAO Han³

1. College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China;
2. Guangzhou Municipal Engineering Testing Co., Ltd., Guangzhou 510520, China;
3. School of Civil Engineering, Chongqing University, Chongqing 400045, China

Received:2024-04-19 Revised:2024-06-17 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 高强混凝土具有优良的力学性能和耐久性,是重大工程最常用的建造材料,提升高强混凝土的压敏性能,实现对混凝土结构健康的自监测和检测,可以防止因结构失效而引发的重大安全事故。本文利用微细钢纤维和纳米炭黑构筑了28 d强度超过80 MPa的高强混凝土,研究了纳米炭黑掺量对高强混凝土力学性能和压敏性的影响。结果表明:纳米炭黑影响混凝土的力学性能,当掺量为水泥质量分数的0.05%时,与对照组相比,混凝土的抗压强度和抗折强度分别提高了21.0%~33.0%和9.6%~33.8%;纳米炭黑可改善高强混凝土的压敏性能,掺量越高则压敏性能越显著、噪声越小、稳定性越好;纳米炭黑改性高强混凝土的力-电信号间遵循指数函数关系,拟合度为0.923;纳米炭黑对高强混凝土压敏性能的影响符合渗流原理,渗流阈值约为0.1%,此时平均灵敏系数提高了5.0倍。

关键词: 高强混凝土, 纳米炭黑, 微细钢纤维, 压敏性能, 渗流原理, 力学性能

Abstract: The high strength cement concrete (HSCC) has excellent mechanical properties and durability, and it is one of the most commonly used construction materials in the key major civil engineering projects. Realizing the pressure sensitivity of HSCC can automatically monitor and test the service capacity of structures, and improve the safety and reliability of buildings. In this paper, HSCC with a 28 d compressive strength of more than 80 MPa was constructed by using micro steel fibers and nano-carbon black (NCB). The effect of NCB content on the mechanical properties and pressure sensitivity of HSCC was studied. The results show that the mechanical properties of HSCC are affected by NCB. The compressive and flexural strength of HSCC with an optimal NCB content of 0.05% of cement mass fraction are about 21.0%~33.0% and 9.6%~33.8% higher than that of the control one, respectively. NCB significantly improves the pressure sensitity of HSCC. The higher the content is, the more significant the pressure sensitivity is, the smaller the noise is, and the better the stability is. The force-electric signal relation follows exponential function relationship and the fitting degree is 0.923. The effect of NCB on the pressure sensitivity of HSCC conforms to the seepage principle, and its seepage threshold is about 0.1%, and the average sensitivity coefficient is increased by 5.0 times.

Key words: high strength cement concrete, nano-carbon black, micro steel fiber, pressure sensitivity, seepage principle, mechanical property

中图分类号:

TU528

易碧良, 李庚英, 王林彬, 高寒. 纳米炭黑改性高强混凝土的力学和压敏性能[J]. 硅酸盐通报, 2024, 43(11): 4012-4018.

YI Biliang, LI Gengying, WANG Linbin, GAO Han. Mechanical Properties and Pressure Sensitivity of High Strength Cement Concrete Modified by Nano-Carbon Black[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4012-4018.

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