采用超声脉冲法研究操作和工艺因素影响下粘接结构混凝土接缝强度的方法和仪器

IF 0.1 Q4 INSTRUMENTS & INSTRUMENTATION
Y. Serikov, Leonid Nazarenko
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引用次数: 0

摘要

从技术和经济的角度来看,在修复工程中使用混凝土粘接接缝是一种有效的技术解决方案。为了制造这样的接头,使用了聚合物胶,例如环氧树脂、硅氧烷、丙烯酸等。这种技术的使用减少了材料消耗、劳动力成本和建筑工程的时间。对已发表的研究成果的分析表明,使用丙烯酸胶粘剂是有效的。在进行粘接混凝土缝时,主要任务是保证粘接结构在其运行过程中所需要的强度。文献分析表明,影响结构强度的主要因素有:外荷载、待胶混凝土强度、胶敷面积、胶敷层厚度。目前,人们正在利用机械、压制设备研究特定因素对胶粘剂结构样品的影响。在实验过程中,将外部载荷施加到粘合剂结构的制造样品上,例如拉伸、弯曲或剪切力。所测参数为粘接结构的强度。在这样的研究中,很难确定导致微裂纹形成的最大外载荷的值,这使得结构的强度降低。因此,这种方法可能会导致研究结论的误差,从而导致实际建筑对象运行可靠性的降低。此外,这种方法使得无法控制那些在实际建筑工地使用的粘性混凝土结构的状况。利用超声脉冲法研究粘结混凝土结构的方法是基于超声振动的传播速度和衰减系数与被研究材料结构的相对变化的依赖关系。开发的方法和仪器的应用可以确定最大允许外部载荷的值,并确保在实际施工现场裂缝形成方面对粘接结构状态的控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methods and instrumentation for studying the strength of concrete joints in adhesive structures under the influence of operational and technological factors by the ultrasonic pulse method
The use of concrete adhesive joints in repair and restoration works is an effective technological solution from technical and economical point of view. To make such joints, polymer glues are used, for example, epoxy, siloxane, acrylic, etc. The use of such technology reduces material consumption, labour costs, and time of construction works. The analysis of published research results showed that the use of acrylic adhesives is effective. When performing an adhesive concrete joint, the main task is to ensure the required strength of the adhesive structure during its operation. The analysis of publications revealed that the strength of the structure is influenced by the following main factors: external load, strength of concrete to be glued, gluing area, and the thickness of the glue layer. Currently, the influence of the specified factors is being studied on samples of adhesive structures using mechanical, press equipment. During the experiments, external loads are applied to the manufactured sample of the adhesive structure, for example, tensile, bending or shear forces. The measured parameter is the strength of the adhesive structure. With such studies, it is difficult to determine the value of the maximum external load that leads to the formation of microcracks, which makes the strength of the structure reduce. As a result, this approach can cause an error in research conclusions, which will lead to a decrease in the reliability of operation of a real construction object. In addition, this approach makes it impossible to control the condition of those adhesive concrete structures that are used on real construction sites. The developed methods to study adhesive concrete structures using the ultrasonic pulse method are based on the dependence of the speed of propagation and attenuation coefficient of ultrasonic vibrations on the relative change in the structure of the material under consideration. The application of the developed methods and instrumentation for their implementation allows determining the value of the maximum permissible external load and ensuring the control of the state of adhesive structures in terms of crack formation on real construction sites.
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来源期刊
Ukrainian Metrological Journal
Ukrainian Metrological Journal INSTRUMENTS & INSTRUMENTATION-
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