利用超声波脉冲法对耐酸混凝土在 "冻结-解冻 "气候循环影响下的运行可靠性进行运行研究的方法论证

IF 0.1 Q4 INSTRUMENTS & INSTRUMENTATION
Yakov Serikov
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引用次数: 0

摘要

建筑行业的一项重要任务是确定建筑物体在混凝土冻融循环气候荷载影响下的运行可靠性。尤其是当这种荷载伴随着湿润,然后混凝土冻结时,这一点尤为重要。这种荷载会破坏混凝土的结构,导致其强度降低。解决耐酸混凝土的这一问题尤为重要,因为耐酸混凝土用于建造卸载或使用具有侵蚀作用的材料和液体(酸、碱等)的平台。根据规范性文件和官方方法,混凝土的抗冻等级是在设计阶段使用破坏性方法确定的。为此,要制备一系列混凝土样品,在一系列 "湿润-冻结-解冻 "循环过程中通过抗压负荷确定其强度。样品在一个特殊的冷冻箱中冷冻。耐酸混凝土操作的特殊性在于,其在实际条件下的饱和不仅发生在水中,还发生在侵蚀性环境溶液中。这会加剧混凝土强度的下降,从而降低其运行可靠性。已发表的旨在改进混凝土抗冻性测定方法的研究成果包括使用嵌入混凝土中的应变仪、声发射法等。这些方法的主要缺点是实施起来非常复杂,或者无法在生产条件下对混凝土进行测试。本文介绍的实验结果表明,使用改进的超声波脉冲法确实有可能确定耐酸混凝土在运行过程中的强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Justification of the methods for operational research of the operational reliability of acid-resistant concrete under the influence of climate cycles “freezing – thawing” by the ultrasonic pulse method
An important task of the construction industry is to establish the operational reliability of construction objects under the influence of cyclic climatic loads from freezing and thawing on the concrete. This is especially relevant if such loads are accompanied by moistening followed by the concrete freezing. Such loads cause a violation of the structure of concrete and lead to a decrease in its strength. It is especially important to solve this problem for acid-resistant concrete, which is used in the construction of platforms for unloading or using material and liquids characterized by their aggressive action – acids, alkalis, etc. According to regulatory documents and official methods, the class of concrete in terms of its frost resistance is determined at the stage of its design using destructive methods. For this purpose, a series of concrete samples are prepared, the strength of which is determined by compressive load during a series of “moistening – freezing – thawing” cycles. Samples are frozen in a special freezer. The peculiarity of the operation with acid-resistant concrete is that its saturation in real conditions occurs not only with water, but also with a solution of an aggressive environment. This can intensify the decrease in the concrete strength, and therefore the decrease in its operational reliability. Published research results aimed at improving the determination of frost resistance of the concrete involve the use of, for example, strain gauges embedded in concrete, the acoustic emission method, etc. The main disadvantage of such methods is the significant complexity of implementation, or the impossibility to test the concrete in production conditions. The results of the experiments presented in the paper indicate a real possibility of determining the strength of acid-resistant concrete during operation using the improved ultrasonic pulse method.
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来源期刊
Ukrainian Metrological Journal
Ukrainian Metrological Journal INSTRUMENTS & INSTRUMENTATION-
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