混凝土的抗冻融等级

IF 0.1 Q4 ENGINEERING, CIVIL
Cristinel Moraru, A. Adelina, George Dan
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引用次数: 0

摘要

摘要冻融现象通过其在建筑构件结构中产生的退化而引起交通基础设施领域的关注。一方面,罗马尼亚的气候特点,另一方面,交通运输中建筑元素暴露在侵蚀性环境中,决定了研究这一现象、其作用/传播模式以及预防和维护的重要性,以确保交通基础设施中建筑的功能。目前,在罗马尼亚法规[*]中,对可持续性进行了保证,就像欧洲适用EN 206[1]的大多数国家附件一样,通过描述性方法(混凝土“设计持久”),指(具有强制性状态)混凝土成分的一系列要求(水灰比、最小水泥用量、夹带空气、抗冻融骨料等)和抗压强度(混凝土抗压强度等级),具体取决于某一暴露类别中元素的分类“X”。这种描述性的国家方法的支持是基于对布加勒斯特土木工程技术大学进行的复杂实验项目中获得的大量结果的分析,通过分析“候选”水泥和水泥“参考”(具有良好的性能和传统用途)的实验室测试结果,以及对使用这两类水泥并在特定环境中维护的建筑构件的“现场”测试/测定结果。在欧洲一级,可持续性的绩效方法取得了明显进展。加速实验室实验方法的发展、性能标准的建立、对各种环境作用的抗性等级以及它们与暴露于各种环境作用等级之间的联系是实验研究的起点,其结果将在本文中介绍。因此,结合这些现代方法,将对与钢筋混凝土结构部实验室合作进行的不同类型水泥的抗冻融性研究中获得的实验结果进行分析,布加勒斯特土木工程技术大学,以及不同类别耐冻融性的分类建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Freeze/Thaw Resistance Classes of Concretes
Abstract The freeze/thaw phenomenon is of interest for the field of transport infrastructure through the degradations it produces in the structure of construction elements. The climatic specificity of Romania on the one hand and the exposure to aggressive environments of construction elements in transport on the other hand, determine the importance of studying this phenomenon, its mode of action/propagation and also prevention and maintenance to ensure the functionality of buildings in transport infrastructure. Currently, in the Romanian regulations [*], the assurance of sustainability is done, as in most national annexes for the application of EN 206 [1] in Europe, by a descriptive approach (concrete “designed to last”) referring to (with mandatory status) a series of requirements of the concrete composition (water / cement ratio, minimum cement dosage, entrained air, freeze/thaw resistant aggregates, etc.) and to the compressive strength (concrete compressive strength class) in depending on the classification of the element in a certain exposure class “X”. The support of this descriptive national approach was based on the analysis of a large number of results obtained in a complex experimental program carried out by Technical University of Civil Engineering Bucharest, by analyzing the results obtained by laboratory tests on “candidate” cements and cements “reference” (having a good behavior and traditional use) as well as “in situ” tests/determinations on construction elements made with both categories of cements and maintained in specific environments. At European level, performance approaches to sustainability have made clear progress. The development of accelerated laboratory experimental methods, the establishment of performance criteria, classes of resistance to various environmental actions and the link between them and the classes of exposure to various environmental actions were the starting point for experimental research whose results will be presented in this article. Thus, in conjunction with these modern approaches, an analysis will be presented on the experimental results obtained in research on freeze/thaw resistance to different types of cements, carried out in collaboration with the laboratory of the Reinforced Concrete Structures Department, Technical University of Civil Engineering Bucharest and proposals for classification in different classes of freeze/thaw resistance.
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