海洋环境服役混凝土局部裂缝识别技术

作者简介：

徐志祥,高级工程师,E-mail:18036609111@ ccccltd. cn

作者单位：

1. 中交第三航务工程局有限公司,上海 200032;2. 中交第三航务工程局有限公司宁波分公司,浙江宁波 315299

基金项目：

∗上海市网络化制造与企业信息化重点实验室开放课题:基于数字图像相关技术的复杂曲面三维全场变形测量方法研究(KT20190601)

摘要：

针对海洋环境下混凝土结构长期服役过程中裂缝的产生与扩展的定量监测问题,开展裂缝识别方法研究。基于数字图像相关技术及局部裂缝运动学原理,提出一种可获取混凝土试件全场变形信息并自动识别局部裂缝的测试技术。利用该技术对不同卵石掺量的海工混凝土裂缝萌生及扩展过程进行测量,并定量评价其抗压强度。结果表明:该方法可准确捕捉局部裂缝,并通过裂缝参数及时判断扩展趋势;随着卵石掺量增加,混凝土抗压强度下降,但裂缝形态由贯通型逐渐转为分散型。上述方法可为海洋环境下混凝土裂缝的定量评估及耐久性预测提供有效技术支撑。

关键词：混凝土;海洋环境;裂缝;识别;数字图像;变形;测量;抗压强度

English：

Aiming at the problem of quantitative monitoring of crack generation and propagation duringlong-term service of concrete structures in marine environment, the crack identification method isstudied. Based on the digital image correlation technology and the principle of local crack kinematics, atest technology that can obtain the full-field deformation information of concrete specimens andautomatically identify local cracks is proposed. The crack initiation and propagation process of hydraulicconcrete with different pebble content were measured by this technology, and the compressive strengthwas quantitatively evaluated. The results show that this method can accurately capture local cracks andjudge the expansion trend in time through crack parameters. With the increase of marine content, thecompressive strength of concrete decreases, but the crack morphology gradually changes from the throughtype to the dispersed type. The above method can provide effective technical support for the quantitativeevaluation and durability life prediction of concrete cracks in the marine environment.

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