嘉绍跨江大桥海工耐久性混凝土回弹测强专用曲线的制定

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发布时间：2021-09-26

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嘉绍跨江大桥海工耐久性混凝土
回弹测强专用曲线的制定
张金海，王伟，常建光
(中铁大桥局嘉绍跨江大桥项目经理部，浙江海宁 314415)
摘要：为满足回弹法检测海工耐久性混凝土强度的需要，以嘉绍跨江大桥为例介绍回弹测
强专用曲线的制定。分析混凝土材料、构件施工工艺、回弹仪及混凝土抗压强度 4个方面对回弹法
测强精度的影响。通过混凝土试件立方体抗压强度与回弹检测强度的对比试验，按最小二乘法回
归分析时所得的相对误差、相对标准差和相关系数，得出该桥海工耐久性混凝土专用的回弹测强曲
线，其成果可作为嘉绍跨江大桥海工混凝土强度评定的重要依据。
关键词：嘉绍跨江大桥；混凝土；强度；回弹法；测强曲线；制定；检测
中图分类号：TU528 、文献标志码：A
Form ulation of Special Curves for Strength Testing of M arine
Durable Concrete of Jiashao Bridge by Rebounding M ethod
ZHANG Jin—hai，WANG W ei，CHANG Jian—guang
(Section of Jiashao River-Cr0ssing Bridge Construction Project，China Railway
Major Bridge Engineering Group Co．，Ltd．，Haining 314415，China)
Abstract：To cater for the need of the strength testing of m arine durable concrete of the
J iashao Bridge by the rebounding method，the special curves for the testing of the concrete are
form ulated and are presented herewith．The influences of 4 aspects of the concrete material，con—
crete member construction technology，rebounding tester and concrete compressive strength on
the precision of the testing are analyzed and the special curves are consequently obtained and for—
m ulated by comparing the testing of the compressive strength of cubic concrete specimen to the
testing of the strength of the m arine durable concrete by the rebounding m ethod and also in ac—
cordance with the relative errors，relative standard errors and related coefficients obtained from
the least—square method regression analysis．The special curves mentioned above can serve as the
important basis for the strength evaluation of the concrete of the bridge．
Key words：J iashao Bridge；concrete；strength；rebounding method；strength testing curve；
form ulation；testing
1 引言
回弹法是弹簧驱动重锤通过弹击杆弹击混凝土
表面，并以重锤被反弹回来的距离 (即回弹值，反弹
距离与弹簧初始长度之比)作为与强度相关指标，来
推算混凝土强度的一种方法。可由试验的方法建
立“混凝土强度与回弹值 ”的相关关系、数学模型或
相关曲线，并以此来推定混凝土的强度值m 。目前
国内采用回弹法测定混凝土抗压强度执行的规程是