混凝土压应力水平对超声声速的影响研究

作者:石志强
单位:安阳工学院土木与建筑工程学院 安阳市结构检测与加固工程技术研究中心
摘要:为研究混凝土压应力水平对超声声速的影响,考虑了混凝土强度等级及龄期两种因素,制作了C20、C30、C35、C40、C45五种强度的混凝土标准立方体试块。在龄期为7、14、21、28、35d时,分别对试块进行不同受压状态下的超声检测试验。结果表明:混凝土在受压状态下超声声速随压应力增加呈分段线性减小趋势。根据应力-声速曲线变化规律,提出了三拐点四线性段假定,建立了混凝土受压状态下应力-声速理论模型;该模型可以将压应力状态下混凝土结构超声检测得到的超声声速修正为无应力状态下的超声声速。经试验验证,该模型误差较小。该研究结果揭示了混凝土受压状态下的超声传播特性,为拓展超声检测范围和提高超声检测评定结果精度提供了参考依据。
关键词:混凝土检测;超声法;压应力水平;混凝土强度;受压状态
作者简介:石志强,硕士,副教授,主要从事土木工程结构及其检测方面的研究,Email:37905344@qq.com。
基金:河南省科技计划重点攻关资助项目(212102110216、152102310205、132102310334);河南省高等学校重点科研项目资助(17A560015)。 -页码-:101-106
尊敬的用户,本篇文章需要2元,点击支付交费后阅读
参考文献[1] 国家建筑工程质量监督检验中心.混凝土无损检测技术[M].北京:中国建材工业出版社,1996.
[2] 《新编混凝土无损检测技术》编写组.新编混凝土无损检测技术:应用新规范[M].北京:中国环境科学出版社,2002.
[3] 缪群,李增选.高强混凝土的超声特性及检测标准问题探讨[J].混凝土,2000(11):39-41.
[4] 郝恩海,刘杰,王忠海,等.混凝土超声声速与强度和弹性模量的关系研究[J].天津大学学报,2002,35(3):380-383.
[5] 张玉敏,王忠海.混凝土抗压强度和弹性模量与其超声声速之间关系的试验研究[J].混凝土,2002(12):40-42,52.
[6] 孙丛涛,牛荻涛,元成方,等.混凝土动弹性模量与超声声速及抗压强度的关系研究[J].混凝土,2010(4):14-16.
[7] 王雪平,刘素瑞,杨久俊,等.混凝土超声波速与抗压强度之间关系的试验研究[J].混凝土,2015(12):34-37.
[8] 李秀春,邓亚,张春良,等.超声回弹综合法检测混凝土结构强度平测修正方法技术研究[J].建筑结构,2019,49(S1):875-877.
[9] 张晋峰,孙彬,毛诗洋,等.装配式混凝土结构内部缺陷无损检测试验研究[J].建筑结构,2020,50(9):26-31.
[10] 刘晓仙,杜红秀,徐瑶瑶.复掺纤维对RPC高温后力学性能及超声规律的影响[J].混凝土,2021(1):87-90,97.
[11] 石志强,李源.混凝土内部质量的截面检测试验研究[J].建筑结构,2022,52(16):94-100.
Research on the influence of concrete compressive stress level on ultrasonic sound velocity
SHI Zhiqiang
(School of Civil and Architectural Engineering, Anyang Institute of Technology Anyang City Structure Testing and Reinforcement Engineering and Technology Research Center)
Abstract: In order to study the influence of concrete compressive stress level on ultrasonic sound velocity, the concrete standard cube blocks with strength of C20, C30, C35, C40 and C45 were made by considering two factors of concrete strength grade and age. When the age was 7, 14, 21, 28 d and 35 d, the blocks were tested under different compression conditions by ultrasonic testing. The results show that the ultrasonic sound velocity of concrete under compression decreases piecewise linearly with the increase of compressive stress. According to the changing law of the stress-sound velocity curve, the assumption of three inflection points and four linear segments was put forward, and a theoretical model of stress-sound velocity of concrete under compression was established. The model can be used to modify the ultrasonic sound velocity of concrete structure under compression to that under non-stress state. The experimental results show that the error of this model is small. The research results reveal the ultrasonic propagation characteristics of concrete under compression, and provide a reference for expanding the range of ultrasonic testing and improving the accuracy of ultrasonic testing and evaluation results.
Keywords: concrete detection; ultrasound method; compressive stress level; concrete strength; compression condition
397 0 0
文字:     A-     A+     默认 取消