龄期对超声回弹综合法检测混凝土构件的误差影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (9): 3166-3175.

龄期对超声回弹综合法检测混凝土构件的误差影响

贠建洲¹, 陈顺超¹, 郑维龙¹, 聂良鹏², 袁胜涛²

1.西南林业大学土木工程学院,昆明 650224;
2.云南通衢工程检测有限公司,昆明 650224

收稿日期:2023-05-18 修订日期:2023-06-19 出版日期:2023-09-15 发布日期:2023-09-14
通信作者: 陈顺超,博士,副教授。E-mail:410106781@qq.com
作者简介:贠建洲(1998—),男,硕士研究生。主要从事桥梁检测与加固方面的研究。E-mail:yunjianzhou2022@163.com
基金资助:
云南省交通运输厅科技项目(云交科教便[2020]91号)

Influence of Age on Error of Concrete Member Tested by Ultrasonic-Rebound Combined Method

YUN Jianzhou¹, CHEN Shunchao¹, ZHENG Weilong¹, NIE Liangpeng², YUAN Shengtao²

1. School of Civil Engineering, Southwest Forestry University, Kunming 650224, China;
2. Yunnan Tongqu Engineering Testing Co., Ltd., Kunming 650224, China

Received:2023-05-18 Revised:2023-06-19 Online:2023-09-15 Published:2023-09-14

摘要/Abstract

摘要： 为研究龄期对超声回弹综合法检测混凝土构件计算抗压强度与实测抗压强度的误差率,本文设计并制作了强度等级分别为C20、C30、C40的混凝土构件。在自然条件下测试C20、C30、C40混凝土构件的回弹值、超声波波速、抗压强度,测试龄期长达730 d,并根据规范计算混凝土计算抗压强度。对比分析龄期对混凝土构件回弹值、超声波波速、计算抗压强度、实测抗压强度的影响,根据试验结果线性拟合回弹值、超声波波速与混凝土构件实测强度的关系。结果表明:三种标号的混凝土构件回弹值发展规律与抗压强度相似;超声波波速随龄期变化可明显分为三个阶段;长龄期下(180 d以后),使用超声回弹综合法计算设计等级较高的混凝土构件(C40及以上)时强度可能会偏高(10%以内),计算设计等级较低的混凝土构件(C30及以下)时强度可能会偏低(10%以内)。长龄期下,超声波波速、回弹值均能较好地表征10~70 MPa的混凝土构件抗压强度,并具有较高的线性相关性,相关系数分别为0.95、0.93。

关键词: 超声回弹综合法, 长龄期, 混凝土, 超声波波速, 回弹值, 抗压强度

Abstract: In order to study the error rate between calculated compressive strength and measured compressive strength of concrete members by ultrasonic-rebound combined method, concrete members of strength classes C20, C30 and C40 were designed and poured. The rebound value, ultrasonic wave velocity and compressive strength of three grades were tested under natural conditions with test age up to 730 d, and calculated compressive strength of concrete was estimated. The effect of age on rebound value, ultrasonic wave velocity, calculated compressive strength and measured compressive strength were compared and analyzed, and the relationships between rebound value, ultrasonic wave velocity and measured compressive strength of concrete members were linearly fitted according to test results. The results show that the development of rebound value of concrete members of three grades is similar to that of compressive strength. Ultrasonic wave velocity can be clearly divided into three stages with age, such as at long ages (after 180 d), the strength of concrete members with higher design grades (C40 and above) may be higher (within 10%) by using the ultrasonic-rebound combined method, and the strength of concrete members with lower design grades (C30 and below) may be lower (within 10%) by using the ultrasonic-rebound combined method. At long ages, ultrasonic wave velocity and rebound value are good at characterizing the compressive strength of concrete members from 10 to 70 MPa, and have high linear correlation with correlation coefficients of 0.95 and 0.93, respectively.

Key words: ultrasonic-rebound combined method, long age, concrete, ultrasonic wave velocity, rebound value, compressive strength

中图分类号:

TU528

贠建洲, 陈顺超, 郑维龙, 聂良鹏, 袁胜涛. 龄期对超声回弹综合法检测混凝土构件的误差影响[J]. 硅酸盐通报, 2023, 42(9): 3166-3175.

YUN Jianzhou, CHEN Shunchao, ZHENG Weilong, NIE Liangpeng, YUAN Shengtao. Influence of Age on Error of Concrete Member Tested by Ultrasonic-Rebound Combined Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3166-3175.

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